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Biogeosciences An interactive open-access journal of the European Geosciences Union
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BG | Volume 16, issue 11
Biogeosciences, 16, 2369-2408, 2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Biogeosciences, 16, 2369-2408, 2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Reviews and syntheses 11 Jun 2019

Reviews and syntheses | 11 Jun 2019

Reviews and syntheses: influences of landscape structure and land uses on local to regional climate and air quality

Landscape, land uses, climate, and air quality
Raia Silvia Massad1, Juliette Lathière2, Susanna Strada3, Mathieu Perrin4, Erwan Personne1, Marc Stéfanon5, Patrick Stella4, Sophie Szopa2, and Nathalie de Noblet-Ducoudré2 Raia Silvia Massad et al.
  • 1UMR ECOSYS, INRA AgroParisTech, Université Paris Saclay, 78850, Thiverval-Grignon, France
  • 2Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, 91191, France
  • 3The Abdus Salam International Centre for Theoretical Physics – Earth System Physics Section, 34151 Trieste, Italy
  • 4UMR SAD-APT, AgroParisTech, INRA, Université Paris-Saclay, 75005, Paris, France
  • 5Laboratoire de Météorologie Dynamique, Ecole Polytechnique, IPSL Research University, Ecole Normale Supérieure, Université Paris-Saclay, Sorbonne Universités, CNRS, Route de Saclay, 91128 Palaiseau, France
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The atmosphere and the land surface interact in multiple ways, for instance through the radiative-energy balance, the water cycle or the emission and deposition of natural and anthropogenic compounds. By modifying the land surface, land use and land cover changes (LULCCs) and land management changes (LMCs) alter the physical, chemical, and biological processes of the biosphere and therefore all land–atmosphere interactions, from local to global scales. Through socio-economic drivers and regulatory policies adopted at different levels (local, regional, national, or supranational), human activities strongly interfere in the land–atmosphere interactions, and those activities lead to a patchwork of natural, semi-natural, agricultural, urban, and semi-urban areas. In this context, urban and peri-urban areas, which have a high population density, are of particular attention since land transformation can lead to important environmental impacts and affect the health and life of millions of people. The objectives of this review are to synthesize the existing experimental and modelling works that investigate physical, chemical, and/or biogeochemical interactions between land surfaces and the atmosphere, therefore potentially impacting local/regional climate and air quality, mainly in urban or peri-urban landscapes at regional and local scales.

The conclusions we draw from our synthesis are the following. (1) The adequate temporal and spatial description of land use and land management practices (e.g. areas concerned, type of crops, whether or not they are irrigated, quantity of fertilizers used and actual seasonality of application) necessary for including the effects of LMC in global and even more in regional climate models is inexistent (or very poor). Not taking into account these characteristics may bias the regional projections used for impact studies. (2) Land–atmosphere interactions are often specific to the case study analysed; therefore, one can hardly propose general solutions or recommendations. (3) Adaptation strategies, proposed after climatic impacts on the targeted resource have been derived, are often biased as they do not account for feedbacks on local/regional climate. (4) There is space for considering atmospheric chemistry, through land–atmosphere interactions, as a factor for land management, helping to maintain air quality and supporting ecosystem functioning. (5) There is a lack of an integrated tool, which includes the many different processes of importance in an operational model, to test different land use or land management scenarios at the scale of a territory.

1 Introduction
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The Earth's atmosphere is an envelope of gases, liquid, and solid particles that provides essential conditions for life to thrive on Earth. Via its composition and exchanges with the land surface, the Earth's atmosphere regulates the physical climate around us and is as indissociable part of every ecosystem and a limited resource. Today, facing global changes in terms of climate, atmospheric composition, biodiversity, and demography, there is a growing demand to preserve a standard quality of life. Conversely, there is an increasing pressure on natural and human-shaped ecosystems to increase production and meet the nutritive and recreational demands of an expanding population. To maintain liveable conditions on Earth, it is important to understand the delicate balance between physical, chemical, and biological processes, and their interactions, which involve the atmospheric envelope and related surface systems (water, soil, flora, fauna, concrete, etc.) at local, regional, and global scales.

The atmosphere and the land surface interact in multiple ways, such as through the radiative-energy balance (Suni et al., 2015), the water cycle (Pielke et al., 1998), or the emission and deposition of natural and anthropogenic compounds (Arneth et al., 2010). Land use and land cover changes (LULCCs) (e.g. deforestation en afforestation, urbanization, cultivation, drying of wetlands) and land management changes (LMCs) (e.g. no-till agriculture, double-cropping, irrigation, cover crops) alter the land surface by modifying the physical properties (e.g. surface albedo, emissivity, and roughness), the chemical emission–deposition potential of land surfaces, and the biological equilibrium of living organisms and soils. Finally, LULCCs and LMCs affect the physical and chemical interactions between the land surface and the atmosphere, the atmospheric composition, and lastly the Earth's climate (Perugini et al., 2017), at local to global scales. The importance of LULCCs on the global climate is widely acknowledged, and global climate models (GCMs), which work at scales of 50–100 km, now integrate LULCC scenarios to investigate future climates (Jones et al., 2014). However, there is an increasing need to understand the effects on climate of LULCCs and LMCs operating at the regional, local, and even territorial scales, and hence to implement LULCC and LMC scenarios in climate models working at finer resolutions (i.e. regional climate models, RCMs) to explore their effects on the regional–local climate.

Today, human activities largely shape landscapes, resulting in a patchwork of natural, semi-natural, agricultural, urban, and semi-urban/peri-urban areas at scales smaller than a hectokilometre (Allen, 2003). The land surface is thus strongly sensitive to socio-economic drivers and influenced by regulatory policies adopted at the local, regional, national, or supranational scales. In this way, human activities strongly interfere in the land–atmosphere interactions and consequently influence climate and air quality at various geographical scales.

Recently, several reviews have examined the interactions between LULCCs and air quality and/or climate change.

Pielke et al. (2011) and Mahmood et al. (2014) reviewed the direct influence of LULCCs on regional climate, through biophysical processes, i.e. the modification of the water, energy, and radiative exchanges between the Earth's surface and the atmosphere's lower boundary from local to regional scales. Based on both observed and modelled data, the authors conclude that LULCCs affect local and regional climate, and, more significantly, the areal coverage of the landscape conversion determines the potential of LULCCs to effectively influence the mesoscale and regional climate.

Arneth et al. (2010, 2012), and more recently Heald and Spracklen (2015), mainly focused on the chemical effects. Arneth et al. (2010) looked at the picture from a global perspective with no special focus on LULCCs. They put forward that feedbacks between the terrestrial biosphere and the atmosphere cannot be ignored from a climate perspective and that our limited understanding of the processes involved implies that none of the feedbacks studied will act in isolation but rather that the system is more complex. The authors warned that non-linearities and possible thresholds exist that should be elucidated before performing simulations with ecosystem–chemistry–climate models. Arneth et al. (2012) encourage the improvement of the representation of biological and ecological processes and bridging the gap between biogeophysical and socio-economic communities, corroborating the need for integrative investigations. Indeed, the authors claim that the level of description for the different processes and interactions involved can significantly modify the projections of land–atmosphere exchanges (physical and chemical) performed with models.

Heald and Spracklen (2015) reviewed the interactions between LULCCs and atmospheric chemistry, with a focus on short-lived atmospheric pollutants, mainly biogenic volatile organic compounds (BVOCs), soil nitrogen oxides (NOx), dust, smoke, bioaerosols, and ozone (O3), and their subsequent radiative effects on global and local climates. The authors estimate that land use change (LUC) can cause a regional direct radiative effect of ±20 W m−2. They identified several gaps of knowledge particularly linked to the aerosol effects on the regional radiative balance and emission variability due to different vegetation types. Other identified uncertainties are the future evolution of agricultural practices as well as the lack of connection between the different atmospheric species or process responses to LULCCs.

More recently, some studies have focused on the impact of small-scale changes, especially urbanization, on climate, and air quality. The work led by Jacobson et al. (2019), for instance, investigated the impact of urbanization in two cities, New Delhi and Los Angeles, on weather, climate and air quality over the 2000–2009 period. The authors applied satellite and road data to assess the extension of urban and road areas, a 1-year inventory for anthropogenic and natural emissions, together with a global-through-urban nested climate–weather–air pollution model (GATOR-GCMOM). Changes in natural emissions related to meteorology were accounted for in this approach. For both New Delhi and Los Angeles, they concluded that urbanization has led to an increase in surface roughness, shearing stress, and vertical turbulent kinetic energy and concurrently to a decrease in near-surface and boundary layer wind speed, thus worsening pollution levels. This study shows that urbanization could have had significant impacts on both meteorology and air quality. Putting these results in a larger regional context would give the possibility to quantify the impact of urbanization on air quality and climate of surrounding peri-urban and rural areas. In that respect, Zhong et al. (2018) investigated the impact of urbanization-induced land cover change and increase in anthropogenic emissions on the air quality of the megacity cluster of the Yangtze River Delta. The authors applied a regional climate–chemistry model (the Weather Research and Forecasting with Chemistry, WRF-Chem) coupled with an urban canopy model. A strong reduction of near-surface aerosol concentrations was estimated over urban regions, whereas particulate pollution increased over the surrounding rural areas. These results were partly due to the urban heat island effect, which increased the lower atmospheric instability and ventilation over the urban area, and therefore promoted the dispersion of pollutants from urbanized areas to their immediate vicinities. This study exhibits the tight links between processes (physical, chemical) and scales (local, regional; urban, peri-urban, and rural areas).

So far, beyond scientific literature, relatively little attention has been paid in spatial planning practices to the consequences of land-use-related decisions and measures on climate conditions and air quality at a local–regional scale. Spatial-planning concerns generally focus on the impacts of densely built-up areas on temperatures in urban contexts (Tam et al., 2015; Du et al., 2007), or on ways to improve the mitigation of climate change (i.e. to enhance the biospheric sink of carbon dioxide, CO2, or decrease its sources). Hence, to our knowledge, very few studies have (1) discussed altogether the different physical, chemical, and biological interactions between the land surface and the atmosphere, (2) focused on urban-/peri-urban areas at local–regional scales, and (3) been addressed by decision makers, stakeholders, and land planners.

Our objective is therefore to review the existing experimental and modelling works that investigate the effects of regional and/or local LULCCs and LMCs on physical, chemical, and/or biological interactions and feedbacks between the land surface and the atmosphere in rural, urban, and/or peri-urban landscapes. We refer to biological interactions as the exchange of chemical compounds that involve soils and biological organisms. The structure and content of this review is designed to be accessible to a large audience, including both specialists, such as scientists, and non-specialists, such as land planners, stakeholders, and decision makers. Non-specialists may refer to the Supplement for a short review of the fundamentals of physics, chemistry, and biology that are at work in LULCCs and LMCs.

Our synthesis focuses on relatively short timescales (with respect to climate), ranging from a few days to a few years, and on local to regional spatial scales ranging from a few to a hundred kilometres. In the text, we will consistently use the word “climate” to refer to changes in mean weather values, considering impacts on local and meso-climate, whereas LULCC-induced impacts on global climate, especially via modification in greenhouse gas emissions and concentrations, are not the target of the present study and will not be covered here. Readers interested in these topics may refer to the studies of Le Quéré et al. (2018) and Saunois et al. (2016) for example. We pay special attention to the territorial dimension, understanding territory as the portion of the land surface delimited and developed by a community according to their needs; this includes the political authority as well as the use and developments made by a social group (Le Berre, 1992; Ginet, 2012). We mainly focus on human-driven changes to land use and land management and on peri-urban landscapes, relying on the fact that today 54 % of the world's population lives in cities (United Nation, 2014) and that the annual rates of urban land expansion ranges from 2.2 % in North America to 13.3 % in coastal areas in China. Although today urban areas represent less than 0.5 % of the Earth's total land area (around 650 000 km2) (Schneider et al., 2009), estimations show that more than 5.87 million km2 of land is likely to be converted into urban areas by 2030, and very likely (probability >75 %) for 20 % of this surface (Seto et al., 2012).

We firstly present land–atmosphere interactions for individual land cover and/or land management changes by discussing physical, chemical, and biological processes. We then explore possible interactions between these processes for a mosaic of different adjacent land uses and managements. We finally identify challenges and needs for current research and propose potential levers for action.

2 Land cover and land use changes: history, dynamics, and challenges
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2.1 Historical perspective

Historically, research on land use intensification and population growth emerged after World War II in different disciplines such as human geography, ecological anthropology, or political ecology and concentrated on understanding agricultural changes. Later, concerns have been raised about the influence of the land surface on climate processes. In the mid-1970's, diverse studies highlighted the impact of land cover change on the land–atmosphere energy balance at local, regional, and global scales due to modifications in surface albedo (Otterman, 1974; Charney et al., 1975, 1977; Sagan et al., 1979). Lately, in the early 1980s, Woodwell et al. (1983) and Houghton et al. (1985, 1987) emphasized the role of terrestrial ecosystems as sources and sinks in the carbon cycle, pointing out the impact of the land cover on global climate. Because of the growing awareness that land surface influences various environmental processes and the climate, understanding the trends, patterns, and mechanisms of LULCCs became a fundamental issue in academic research (e.g. Ramankutty and Foley, 1999; Klein Goldewijk, 2001, 2011; Foley, 2005; Lambin and Geist, 2006; Ellis, 2011). In the 1990s, the availability of land use data through remote sensing shifted the focus from land use intensification to land use and land cover studies (Erb et al., 2007; Verburg et al., 2011). More recently, due to its far-reaching, potentially detrimental ecological consequences, land use intensification has attracted the interest of the scientific community at large (Erb et al., 2013).

2.2 Land use and land cover change

Although land change may be one of the most ancient of all human-induced impacts on the environment, the Earth's land surface has never been altered by anthropogenic activity at the pace, magnitude, and extent experienced over the past few centuries (Lambin et al., 2001). On the basis of distinct studies, it can be estimated that roughly 12 million km2 of forests and woodlands has been cleared over the last 3 centuries, representing approximately a 20 % decrease in forest cover: Richards (1990) estimated a 11.7 million km2 loss – from 62.2 to 50.5 million km2 – between 1700 and 1980, Ramankutty and Foley (1999) indicated an 11.35 million km2 loss – from 55.27 to 43.92 million km2 – between 1700 and 1992, and Klein Goldewijk (2001) mentioned a 12.9 million km2 loss – from 54.4 to 41.5 million km2 – between 1700 and 1990. Although huge variations can be noticed between studies, notably because of land use/land cover definition and classification issues, similar trends have been reported regarding changes in natural areas (steppes, savannas, grasslands, shrublands, tundras, and hot/ice deserts): Ramankutty and Foley (1999) mentioned a 7.3 million km2 loss – from 73.2 to 65 million km2 – between 1700 and 1992 while Klein Goldewijk (2001) assessed a 25 million km2 loss – from 71.9 to 46.9 million km2 – between 1700 and 1990. In his review on the anthropogenic transformations of the terrestrial biosphere, Ellis (2011) spatially quantified the temporal aspects of human transformations on the ecosystems (Fig. 1).

Figure 1Anthropogenic transformation of the terrestrial biosphere showing the number of years of intensive use from Ellis (2011).

Such a focus has led us to consider, especially under the scope of an integrated land science, the various and complex interactions between human societies and the environment (Turner, 2002). The land cover – which can be understood as one biophysical attribute of the surface (Turner et al., 1995) – is now predominantly dependent on the land use – which can be understood as the activity human societies have used the land for in accordance with economic, cultural, political, historical and land tenure considerations (Turner et al., 1995). On the world's ice-free land surface of approximately 130.1 million km2, the area directly reconfigured by human action as of 2007 has been estimated at 53.5 % (Hooke and Martin-Duque, 2012).

This decline of natural ecosystems is essentially due to the conversion of forests, savannas, and grasslands into agricultural lands. The global areas of croplands and pastures increased significantly since 1700 with estimated extension from 12.3 million (Goldewijk, 2011, 1700–2000 period) to 14.75 million km2 (Pongratz et al., 2008; 1700–1992 period). By combining the results of different studies addressing this land transformation issue, Hooke and Martin-Duque (2012) estimated that, today, croplands and pastures represent, respectively, 12.8 % and 25.8 % of the world's ice-free land surface (Fig. 2).

Figure 2Adapted from Hooke and Martin-Duque (2012). Changes in land use through time (closed symbols) with extrapolations to 2050 CE (open symbols).


Finally, the land transformation related to urban development and infrastructure expansion must be pointed out. A total of 8.4 million km2 can be classified as urban areas, rural housing, business areas, highways, or roads (Hooke and Martin-Duque, 2012). Even if increasing, commonly at the expense of agricultural land (Döös, 2002), this number represents only about 6.46 % of the world's ice-free land surface. However, such a land transformation can strongly affect environmental processes at local and/or regional scales and therefore affect the health and life of millions of people, given the human density in the areas impacted (Ermert et al., 2012; Jagger and Shively, 2014).

2.3 Land use intensification

Another aspect of land use that affects the environment is land use intensification. In the scientific literature, there is no unique definition of land use intensification or land use intensity, even though the concept is increasingly referred to. The diversity of definitions reflects on the one hand a disciplinary diversity and, on the other, a certain relationship between humans and nature (Lindenmayer et al., 2012; Erb et al., 2013, 2016). From these two different contexts two distinct definitions of land use intensification emerge. The first comes from an agricultural point of view where land use intensification is simply defined as the increasing production from the same land by additional inputs in terms of labour, energy, fertilizer, and water (Erb et al., 2009; Krebs et al., 1999). Most of the time this involves developed agricultural techniques and an increased amount of input to the ecosystem (fertilizers, pesticides, etc.) (Lindenmayer et al., 2012). The land use intensification via production is thus operated in a neutral way on land area where intensification is the means by which gains are made using increased inputs per unit land area (Moller et al., 2008). However, it can involve a land use change in the case of the implantation of bioenergy crops, for example. As a second definition, land use intensification can also be seen from an ecological or biodiversity point of view as the increasing transformation of the land away from the original habitat. From this point of view, land use intensification is accompanied by landscape and ecosystem simplification, from complex natural systems to simplified agricultural ecosystems (the more one moves toward intensification, the more the other tends to move towards landscape uniformity in a reduction of biodiversity), or to urbanization (Flynn et al., 2009). This type of intensification is, however, never neutral on land area and systematically involves a LULCC. The difference between this view of land use intensification and LULCC is that the change is always towards a more human-shaped system, whereas LULCC can occur in the opposite direction by afforestation, restoration, etc.

As a result, it is very difficult today to draw a picture of the dynamics behind or the evolution of land use intensification simply because there is no common definition and terminology and there are many knowledge gaps related to the underlying processes and determinants of the levels, patterns, and dynamics of land use intensity (Shriar, 2000; Erb, 2012). However, it is essential to (a) assess the impacts of those changes and intensifications and (b) have the tools to assess their influences on the biosphere and on biosphere–atmosphere interactions. In the sections below, we review the documented effects on the atmospheric compartment from a physical, chemical, and biological point of view and classify them in two categories (Fig. 3): land cover change and land intensification (agricultural and urban).

Figure 3Main changes in LULCC and LI (land use intensification) from an anthropic perspective and their classification relative to the sections of this paper.


3 Human-driven land use and land management changes and their impact on climate and air quality
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3.1 Land cover change

Most historical LULCCs are considered to have globally decreased primary production and therefore had an impact on atmospheric CO2 concentrations and thus on global warming, as shown by Gruber and Galloway (2008). This can be explained by the fact that past LULCCs concerned primarily deforestation and the increase in urban areas, thus leading to lower ecosystem productivity and a release of soil and biomass-stored carbon to the atmosphere in the form of CO2. Moreover, LULCCs affect physical interactions between the land surface and the atmosphere and atmospheric components other than CO2 such as reactive nitrogen compounds via their effects on the carbon (C) and nitrogen (N) cycles. This is mainly induced by the alteration of land–atmosphere exchanges through changes in (i) stomatal conductance, (ii) deposition and adsorption on the leaf surfaces and cuticles, which varies according to plant species, (iii) the canopy architecture and its physical properties (leaf area, tree height), and (iv) availability of free soil water, which affects the production and the exchange of certain compounds, as illustrated below by some examples.

3.1.1 Deforestation–afforestation

Deforestation has been practiced for tens of thousands of years for agriculture, grazing, cultivation, and urban purpose. However, over the last 33 centuries deforestation has drastically increased, with around 12 million km2 of forests cleared and 40 million km2 remaining today (Ramankutty and Foley, 1999; Klein Goldewijk, 2001;, last access: 22 May 2019).

From a physical perspective, several studies investigated the effects on climate of deforestation, or of its opposite (afforestation), mainly via a modelling approach. These studies compare the effects on climate of changes between current and pre-industrial potential vegetation, under the hypothesis of no human activities. Among its biogeophysical effects on climate, deforestation has contrasting effects on air temperature that depend on the latitude and the vegetation types involved (Claussen et al., 2001; Snyder et al., 2004; Gibbard et al., 2005; Bala et al., 2007; Betts et al., 2007; Jackson et al., 2008; Davin and de Noblet-Ducoudré, 2010; Beltràn-Przekurat et al., 2012). At high latitudes, deforestation triggers a winter and spring surface cooling due to changes in the radiation budget that compensate, at the annual scale, for the summer warming resulting from decreased latent heat flux (i.e. evaporation). In particular in boreal regions, forest removal strongly increases the surface albedo. Indeed forests mask the snow as opposed to herbaceous vegetation (Chalita and LeTreut, 1994; Betts et al., 2001; Meissner et al., 2003; Randerson et al., 2006). At low latitudes, deforestation leads to a surface warming due to changes in the water cycle. Conversion of tropical rainforests to pasture lands (as in the Amazon Basin region) strongly modifies surface evapotranspiration and roughness since, compared to pasture lands, trees have a higher surface roughness that enhances surface fluxes and thus the evapotranspiration cooling efficiency (Shukla et al., 1990; Dickinson and Kennedy, 1992; Lean and Rowntree, 1997; von Randow et al., 2004; Nogherotto et al., 2013; Lejeune et al., 2015; Spracklen and Garcia-Carreras, 2015; Llopart et al., 2018). In the long term, reduced evapotranspiration and precipitation may lengthen the dry season in the tropics, thereby increasing the risks of fire occurrence (Crutzen and Andreae, 1990). At mid-latitudes, both albedo and evapotranspiration mechanisms are at work and compete against each other, as recently confirmed by satellite-based observation analysis (Li et al., 2015; Forzieri et al., 2017). Although studies over the mid-latitudes show somewhat contradictory results and the effect on air temperature (warming/cooling) remains unclear in temperate regions such as the Mediterranean Basin region and Europe (Gaertner et al., 2001; Heck et al., 2001; Anav et al., 2010; Zampieri and Lionello, 2011; Gálos et al., 2013; Stéfanon et al., 2014; Strandberg and Kjellström, 2019), in the Northern Hemisphere, the historical land cover change has very likely led to a substantial cooling (Brovkin et al., 1999, 2006; Bonan, 1997; Betts, 2001; Govindasamy et al., 2001; Bounoua et al., 2002; Feddema et al., 2005a), comparable in magnitude with the impact of increased greenhouse gases (Boisier et al., 2012; de Noblet-Ducoudré et al., 2012). However, a recent study combines present-day observations and state-of-the-art climate simulations and shows that historical deforestation in North America and Eurasia has made the hottest day of the year warmer since pre-industrial times, contributing to at least one-third of the local present-day warming of heat extremes (Lejeune et al., 2018). In addition to modifying mean and extreme temperatures, deforestation–afforestation can also modify the hydrological cycle by enhancing or inhibiting convective clouds and precipitation in the overlying atmospheric column. Some studies show an enhancement of shallow cumulus clouds over deforested lands in Amazonia (Chagnon et al., 2004; Wang et al., 2009), while opposite results were found over deforested lands in southwest Australia (Ray et al., 2003). Two different mechanisms result from the interplay between the surface heat fluxes and the boundary layer structure (i.e. stability, temperature, and humidity): (1) dry soil and high sensible heat flux can increase the entrainment of cold air from the boundary layer top and finally increase shallow cloud cover by lowering the saturation threshold (Westra et al., 2012; Gentine et al., 2013). (2) Conversely, wet soil and high latent heat flux moisten the boundary layer and increase the relative humidity at its top in case of deforestation.

From a biological perspective, deforestation implies modifications in surface moisture and temperature that in turn might directly or indirectly affect decomposition rates and nutrient mineralization in soils (Dominski, 1971; Stone, 1973; Stone, 1979; Classen et al., 2015; Manzoni et al., 2012; Chen et al., 2014; Townsend et al., 2011; Bonan, 2008). As a result, both carbon and nitrogen release to the environment are forecasted to increase. The forest floor decomposes rapidly (Covington, 1976; Bormann and Likens, 1979) and, without forest regeneration, will eventually be partially eroded. The combination of increased decomposition (which consumes oxygen) and wetter soils (which slow oxygen diffusion) may also increase the occurrence of anaerobic microsites within the soils, which might contribute to methane (CH4) emissions (Adji et al., 2014; Jauhiainen et al., 2016). Nitrogen can be lost to the atmosphere through ammonia (NH3) volatilization, nitrous oxide (N2O) production during nitrification (Bremner and Blackmer, 1978; Veldkamp et al., 2009), or denitrification to N2O or atmospheric nitrogen (N2) (Firestone et al., 1980; Neill et al., 2005; Lammel et al., 2015). Soil properties such as soil organic carbon or soil nitrogen cycling respond to deforestation with a large spatial variety from one system to another (Powers and Schlesinger, 2002; Chaplot et al., 2010; de Blécourt 2013). However, the largest emissions of non-CO2 greenhouse gases will probably result from agricultural use and management on deforested areas.

Finally, several studies show that there are feedbacks between tropical forests and climate change (Bonan, 2008). Carbon dioxide fertilization, for example, could have a positive effect by sustaining tropical forest growth (Lapola et al., 2009; Salazar and Nobre, 2010). This is exacerbated by N fertilization since tropical areas are not limited-N environments and N is increasing through atmospheric deposition in non-tropical areas (Magnani et al., 2007; Sutton et al., 2008; Samuelson et al., 2008; Jackson et al., 2009). Zaehle et al. (2011) showed that N inputs increased C sequestration by ecosystems, and Churkina et al. (2007) attributed 0.75–2.21 GtC yr−1 during the 1990s to regrowing forests. However Yang et al. (2010) showed that the contribution of N fertilization is lower for secondary forest regrowth (Jain et al., 2013).

As a direct effect, afforestation inevitably leads to carbon loss from the system (Feddema et al., 2005b; Foley et al., 2005; Le Quéré et al., 2013; Houghton et al., 2012). However, large uncertainties remain on (i) how these altered ecosystems will react to induced global climate change (increased CO2 concentration, increased temperature, etc.), (ii) changes in the emissions of non-CO2 greenhouse gases (N2O, CH4), and (iii) changes in the exchange of reactive trace gases.

From a chemical perspective, afforestation directly affects BVOC emissions since trees are high BVOC emitters, as documented by Purves et al. (2004) over the eastern US by combining a BVOC emission model with vegetation changes as recorded by the USDA Forest Service Inventory Analysis (FIA) over surveyed forest plots. Over the target region, emissions of the main BVOCs (i.e. isoprene and monoterpene) have increased, especially under heatwave conditions (i.e. daily air temperature above 35 C), due to increase in the forest leaf area mainly driven by human disturbance via harvesting and plantation management (i.e. often plantation forestry introduces high emitters), but as well by perturbing ecological succession with fires and pollution. Enhanced BVOC emissions from forests are likely to modify the NOx–VOC–O3 regime; nevertheless the outcome critically depends on the fate of isoprene nitrates, whether they are a terminal or temporal sink of NOx (Val Martin et al., 2015). Concerning fine-mode aerosols, summer levels of PM2.5 (i.e. particulate matter, PM, with aerodynamic diameters ≤2.5µm) are predicted to increase with afforestation due to the formation of biogenic secondary organic aerosols (BSOAs) from BVOCs (Heald et al., 2008; Trail et al., 2015; Val Martin et al., 2015). As with afforestation, deforestation to create pasture or crop lands can also exacerbate O3 levels by increasing NOx emissions from soil microbial activity, promoted with fertilization (Ganzeveld and Lelieveld, 2004; Trail et al., 2015); in winter, the enhanced NOx levels favour nitrate aerosol production, while in summer deforestation decreases aerosol deposition, by reducing surface roughness. In conclusion, fine-mode aerosols such as PM2.5 may increase year-round under deforestation (Trail et al., 2015).

Under an increasing demand and interest for fast-growing plants for food production, cattle feed, domestic products, and biofuels, plantations are rapidly expanding all over the world. The choice of crop or tree type influences BVOC emissions and the resulting O3 and BSOA levels (Hewitt et al., 2009; Ashworth et al., 2012; Warwick et al., 2013; Stavrakou et al., 2014). This is the case of oil palm crops that show much larger BVOC emission potentials compared to primitive forests (from 3 to 10 times higher for isoprene; Hewitt et al., 2009, and Fowler et al., 2011). In South East Asia, increasing BVOC emissions from oil palm plantations interplay with increasing NOx emissions resulting from the spread in mechanization, fossil fuel use, and fertilizer application associated with the oil palm industry. The complex interaction between BVOC and NOx finally enhances O3 levels at local–regional scales (Goldammer et al., 2009; Hewitt et al., 2009; Silva et al., 2016; Harper and Unger, 2018), with even transboundary effects (i.e. downwind regions) (Warwick et al., 2013). Similarly to South East Asia and oil palm production, the expansion of biofuel production in Europe could modify future LULC to satisfy the increasing demand for renewable energy sources (Beringer et al., 2011). Among biofuel feedstock, crops such as miscanthus or second-generation plantations such as poplar show higher isoprene emission potential compared to European native species. The conversion of European grass- and croplands into biofuel plantations may affect summer O3 levels with effects that strongly depend on the interaction between BVOC and NOx emissions. For example, to limit the effects on O3 production of a steep increase in isoprene emissions (∼45 %) from conversion of 5 % of European grass- and croplands into poplar plantation, NOx emissions should be reduced by 15 %–20 % (Beltman et al., 2013). Regarding Europe, Ashworth et al. (2013) showed that the extension of short-rotation coppice for biofuel feedstock could have small but yet important impacts on surface O3 concentrations, and subsequently on human mortality and crop productivity, since it would modify emitted compounds and their levels. Being BSOA precursors, enhanced BVOC emissions from afforestation are also involved in particulate matter pollution.

Using a large-scale chemistry-transport model for present-day climate, Ashworth et al. (2012) investigated the impact of realistic large-scale scenarios of biofuel feedstock production (∼100 Mha plantations) in both the tropics and the mid-latitudes on isoprene emissions, O3, and BSOA formation. These LULCCs drive an increase in global isoprene emissions of about 1 %, with a substantial impact on regional O3 levels and BSOAs. In the tropics, the expansion of oil palm plantations enhances BSOAs by 0.3 µg m−3 (+3 %–5 %, BSOA annual mean concentrations: 6–10 µg m−3). In the mid-latitudes, the establishment of short-rotation coppice increases BSOA concentrations up to 0.5 µg m−3 (+6 %, from 8 µg m−3).

3.1.2 Wetland conversion–restoration

Although wetland drainage is a relatively small proportion of the world's land surface, LULCC can have significant impacts on some areas. Wetland drainage for agriculture purposes has removed between 64 % and 71 % of natural wetlands since 1900 (Davidson, 2014).

From a physical perspective, only few studies have evaluated its impact on local and regional climate. The most documented case is that of south Florida (Pielke et al., 1999; Weaver and Avissar, 2001; Marshall et al., 2004a, b). During the 20th century, large wetland areas in south Florida were converted to large-scale crops (cereals), citrus growth, and fruit crops in general. Modelling studies show that current surface cover caused significant changes in temperature extremes with increased length of freezing events and increased magnitude of frost (lower temperature), which severely reduced the agricultural production (Marshall et al., 2004a). During night-time, water vapour evaporates from the swamps and modifies the longwave radiation budget, resulting in a less rapid infrared cooling and less cooling by +2C than for the current (drained) case. A similar study over Switzerland shows opposite results (Schneider and Eugster, 2007). The conversion of wetlands to extensive farming caused a night-time warming and a daytime cooling of a few tenths of a degree Celsius. This temperature modification was explained by the alteration of soil thermal properties and by higher albedo in the current case. During the night-time, higher thermal conductivity of the current soils resulted in upward heat fluxes, which enhanced the temperature. In another vein, Mohamed et al. (2005) studied the effect of Sudd swamp on the Nile water flow and local climate. Due to the Sudd wetland, located in the upper Nile, a substantial amount of water is lost through evapotranspiration. In a drained Sudd scenario produced by a numerical experiment, the Nile flow just downstream the wetlands increases by 46 Gm3 yr−1 over a total of 110 Gm3 yr−1. However, evapotranspiration decreases, causing a temperature increase of +4–6 C during the dry season.

From a biological perspective, the drainage of peatlands and wetlands for agricultural use alters several characteristics of those areas and could thus be problematic (see Verhoeven et al., 2011, for a review). Especially in tropical areas, peatland draining releases some extra CO2 by oxidizing and subsiding peat soils used for growing oil palms (Immirzi et al., 1992; Maltby and Immirzi, 1993; Safford et al., 1998; Furukawa et al., 2005). Hoojer et al. (2006) estimate the emissions from Indonesian peatland draining at 516 Mt C yr−1 (fires excluded). Conversely, since wetlands are a considerable source of CH4, their drainage will decrease emissions of CH4 and can thus be considered a carbon gain from that point of view (Bergkamp and Orlando, 1999; Maltby and Immirzi, 1993). However, this gain is counterbalanced by increased N2O emissions, due to the lowering of the water table (Kasimir-Klemedtsson et al., 1997; Maljanen et al., 2010). On the other hand, changes in vegetation and therefore growth in those drained areas involve an increased carbon sink from vegetation. However, this additional sink rarely compensates for the greenhouse gas (GHG) losses resulting from C losses from the soil (Yeh et al., 2010; Yew et al., 2010).

From a chemical perspective, on top of decreasing CH4 emissions, wetland drainage may probably increase NOx emissions, and modify emissions of other compounds such as BVOCs, due to vegetation change, which together could contribute to significant changes in the atmospheric chemical composition. Overall, the impact of wetland conversion on compound emissions other than CH4 and on atmospheric chemistry has been poorly investigated.

3.2 Land intensification

3.2.1 Urbanization

Urbanization results in the replacement of (pseudo-)natural ecosystem vegetation by more or less dense and impervious built-up environments. Human activities concentrated in these areas are responsible for additional heat and gaseous releases in the atmosphere. Consequently, these LULCCs sharply modify the atmosphere, in terms of both climatic conditions and gas composition, which ultimately affect land–atmosphere exchanges and biogeochemical cycles.

From a physical perspective, urbanization results in a modification of surface radiative budget, energy balance, water balance, and land–atmosphere mass and energy exchanges (see Eqs. S1 to S5 in the Supplement), leading ultimately to (local) climate alteration in urban areas.

Firstly, urbanization affects each component of the radiative budget. On the one hand, the net radiation is potentially reduced due to the decrease in the incoming shortwave radiation that is screened out by a reflecting smog layer. In the dry season, in clear skies, Jauregui and Luyando (1999) observed that the incoming solar radiation over Mexico City was 21.6 % lower than its suburbs. This difference could increase up to 30 % under weak winds. However, the intensity of the reduction in incoming shortwave radiation was closely related to the day of the week (i.e. human activities) and meteorology (e.g. temperature, humidity, solar radiation), which both influence photochemical smog formation. Similarly, Wang et al. (2015) measured lower incoming shortwave radiation in Beijing compared to its surroundings, with values ranging between 3 % and 20 % depending on the season. Focusing on summer periods (June, July, August), Li et al. (2018) recorded lower S at urban stations compared to rural stations in the city of Berlin; the authors attributed this dimming effect to the thick aerosol layer observed over the city. Based on the analysis of global radiation measurements from the Global Energy Balance Archive (GEBA), Alpert et al. (2005) and Alpert and Kishcha (2008) showed a relationship between solar dimming, population density, and atmospheric pollution such as aerosols, which absorb and scatter the incoming solar radiation. Overall, Alpert and Kishcha (2008) demonstrated that at the surface shortwave radiation is 8 % lower in urban compared to rural areas. Moreover, the net radiation is also potentially reduced by the enhanced outcoming longwave radiation due to a warmer urban environment (the so-called “urban heat island effect”; see below) since infrared radiations depend on surface temperature. On the other hand, urbanization also induces an increase in net radiation. Urbanization usually results in a decrease in surface albedo (α) and surface emissivities (εs) (Table 1), finally reducing both outgoing short- and longwave radiation. Although some building materials exhibit larger albedo and emissivity than (pseudo-)natural environments, most of them have lower ones, especially asphalt or other dark materials (e.g. Li et al., 2013; Alchapar et al., 2014; Rahdi et al., 2014). Yet, at the city scale, outgoing short- and longwave radiation is scattered and absorbed multiple times within urban canyons (i.e. light-trapping effect), thus contributing to both outgoing short- and longwave radiation reduction. Overall, both effects tend to compensate for each other and only a few differences in Q* have been observed between urban and rural environments on a yearly average (Oke and Fuggle, 1972; Christen and Vogt, 2004). Nevertheless, depending on the seasons and time of the day, larger net radiation has been observed in urban areas during daytime and in winter, when snow covers surrounding rural areas (Christen and Vogt, 2004).

Table 1Typical values of snow-free albedo (α – %), Bowen ratio (β – %), and roughness length (z0 – m) for various surface land cover types.

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Secondly, compared to the surrounding areas, an urban environment sharply modifies the way surface energy is dissipated (i.e. the energy partitioning between sensible and latent heat fluxes). In rural environments vegetation and pervious surfaces provide larger evapotranspiration rates (i.e. latent sensible heat flux), and therefore lower sensible heat flux, whereas in urban areas energy is mainly dissipated through sensible heat flux. A non-natural term, sensible heat flux, due to heat release by human activities (e.g. building heating or cooling), adds to a natural sensible heat flux, further increasing sensible heat flux in urban areas (Arnfield, 2003). As a result, the Bowen ratio is amplified in urban areas (Table 1). Such a large dissipation of energy through sensible heat flux, which transfers heat from the surface to the air, leads to the so-called urban heat island (UHI) effect, the most well-known alteration of (local) climate due to urbanization that corresponds to a warmer climate in urban environments compared to surrounding rural environments (around 2–3 C). UHI is defined as a temperature difference between the city and its surroundings, depending on the local land use. Nevertheless, UHI intensity is sharply variable according to the time of day (e.g. Pearlmutter et al., 1999), the season (e.g. Eliasson, 1996; Zhou et al., 2014), the geographical location, spatial organization of the urban fabric (e.g. building size and density, human use, fraction of vegetation) (e.g. Emmanuel and Fernando, 2007; Hart and Sailor, 2009), and rural land use (e.g. forests, crops, bare soil) (Chen et al., 2006). Recently, Yao et al. (2019) combined satellite-based observations of land surface temperature (LST) and enhanced vegetation index and showed that rural greening has contributed by +0.09C per decade (23 %) over the period 2000–2017 to the increase in daytime surface UHI intensity (i.e. urban LST minus rural LST). By modifying the local energy budget, urbanization modifies the boundary layer structure and lastly influences the water budget. Urban signatures (e.g. change in magnitude, intensity, and spatial patterns) have been observed in precipitation (see Shepherd, 2005, and Pielke et al., 2007, for a review on urban precipitation). Moreover, complex urban terrain amplifies regional gradients in temperature, pressure, moisture, and wind that act as a source of vorticity for storm ingestion and development into tornadoes (Kellner and Niyogi, 2014). Moreover, urban areas can attenuate, split, or deflect extreme storm events (e.g. Lorenz et al., 2019) and modify their intensity and occurrence. Over the Beijing metropolitan area, 60 %–95 % of the selected weather stations show that the intensity and occurrence of extreme rainfalls have slightly decreased throughout 1975–2015, periods with consecutive rainy days (CRDs) have lengthened, and the Julian dates of daily maximum precipitation have been delayed (Zhang et al., 2019). Furthermore, cities are important source of aerosols that help initiate thunderstorms (Haberlie et al., 2015). However, the joint study of UHI and urban pollution island is still in its infancy and the indirect radiative effect of aerosols (i.e. impact on cloud properties and formation) on UHI needs further investigations (Li et al., 2018).

To mitigate UHI-induced warming, vegetated or highly reflective roofs are being integrated in the built environment and have received a growing interest in climate modelling studies. Cool roofs absorb less incoming shortwave radiation than dark roofs. They decrease the local and regional summer surface temperature by 0.1–0.9 C (Millstein and Menon, 2011; Georgescu et al., 2012; Salamanca et al., 2016; Vahmani et al., 2016). Their impact on climate is not just limited to surface energy budget as, for example, precipitation decrease was put forward in a modelling framework (Georgescu et al., 2012). Benefits from green roofs are analogous to cool roofs, as vegetation contributes to cooling via increased albedo and water evapotranspiration. In situ experiments with different species have surface temperature differences up to 3 C (MacIvor and LundHolm, 2011). However at the regional scale and over urban areas, simulated cooling is greater for the cool roofs relative to the green roofs because of the vegetation seasonality and sensitivity to dryness (Georgescu et al., 2014).

From a biological perspective, at a local scale, the development of urban areas and the related activities directly affect air quality and local temperatures, which leads to modifications in the biology of organisms. Studies based on the analysis of tree traits along an urban–rural gradient showed that tree growth and phenology are affected by the vicinity of an urban area mainly due to increase in temperature (Gillner et al., 2014; Mimet et al., 2009; Dale and Frank, 2014), CO2 concentrations (Calfapietra et al., 2010; Ziska and George, 2004), ozone deposition (Gregg et al., 2003; MacKenzie et al., 1995), and through the enhanced effect on air quality via the increased emissions of BVOCs (Calfapietra et al., 2013; Lathière et al., 2006). Recent studies have also focused on the effects of soil waterproofing in urban areas that reduce water availability and exacerbate water stress in urban forests, significantly affecting growth (Vico et al., 2014; Volo et al., 2014; Scalenghe and Marsan, 2009).

From a chemical perspective, at local scales, urbanization directly affects both O3 and aerosol levels by increasing the number of emission sources on a limited area (e.g. traffic, domestic heating). In the literature, there is an increasing interest in the direct impacts of urbanization on air quality (special issues in the Atmospheric Chemistry and Physics journal related to the Megapoli-Paris 2009/2010 campaign and the MILAGRO and the City-zen projects, Baklanov et al., 2011, 2018; Zhu et al., 2019; Ooi et al., 2019), with a special focus on O3 levels, summer pollution (Nowak et al., 2000; Civerolo et al., 2007; Jiang et al., 2008), and the role of urban trees in O3 pollution via BVOC emission changes (Chameides et al., 1988; Cardelino and Chameides, 1990; Corchnoy et al., 1992; Benjamin et al., 1996; Taha, 1996; Benjamin and Winer, 1998; Yang et al., 2005; Taha et al., 2016; Livesley et al., 2016; Churkina et al., 2017; Bonn et al., 2018).

Increase in urban LU following population growth exacerbates O3 pollution during summer, mainly due to changes in NOx emissions (Zhu et al., 2019). In the greater Houston area (Texas), under a projected increase in urban LU by 62 %, together with changes in anthropogenic and biogenic emissions, the number of extreme O3 days in August rose by up to 4–5 days, with LUCs contributing to a 2–3 d increase (Jiang et al., 2008). In the greater New York City region, future urban LU changes may enhance episode-average O3 levels by about 1–5 ppb and episode-maximum 8 h ozone levels by more than 6 ppb (Civerolo et al., 2007). In metropolitan regions, changes in O3 levels show a heterogeneous spatial pattern: they decrease in the urban core, likely due to high NOx levels (O3 titration), while they generally increase downwind of precursor sources (Civerolo et al., 2007; Jiang et al., 2008). In an urban environment, BVOC emissions from urban trees seem to have a negligible effect on summer O3 levels (<1 ppb compared to increases of 1–7 ppb due to urban LUCs; Nowak et al., 2000, vs. Jang et al., 2008). However, the effect of urban green areas on BVOC emissions and O3 pollution depends on tree species (Taha, 1996; Taha et al., 2016); for this reason, the choice of urban trees based on their BVOC potential may be addressed as a critical urban land management practice (Benjamin et al., 1996; Benjamin and Winer, 1998; Churkina et al., 2015; Calfapietra et al., 2015; Grote et al., 2016). For example, in Beijing, deciduous trees dominate (76 %) and some of the main species are high BVOC emitters (e.g. Sophora Japonica L., Populus tomentosa L., and Robinia pseudoacacia L.), which may favour a worsening in O3 pollution due to the rapid increase in NOx emissions (Yang et al., 2005). In the Los Angeles metropolitan area, Corchnoy et al. (1992) measured BVOC emission rates of 11 tree species to underpin the selection of potential shade trees, whose planting should reduce the urban heat island effect. Accounting for California climate, the authors suggested the best (e.g. crape myrtle and camphor tree) and poor (e.g. liquidambar and carrotwood tree) choices for urban trees, and underlined that a large difference in BVOC emissions should be factored into decision-making about shade trees to plant. In California's South Coast Air Basin, medium- and high-emitting trees may lead to hazardous O3 levels (>50 ppbv) (Taha, 1996). In the same geographical area, the most effective scenario to reduce the peak ozone involves replacing 4.5 Mha of high BVOC emitters with low BVOC emitters, while to target all-hour ozone the best choice consists in planting 2.5 Mha of low BVOC emitters in urbanizing areas and switching 4.5 Mha from high- to low-emitting species (Taha et al., 2016). It is important to emphasize that, although BVOC concentrations are usually lower than anthropogenic volatile organic compound (AVOC) concentrations in urban areas, BVOCs react faster than AVOCs and can thus have significant effects in urban areas, as shown by Chameides et al. (1988) in the Atlanta metropolitan region.

At the regional scale, Chen et al. (2009) demonstrated that LULCCs can offset the impact of temperature on biogenic emissions and concluded that LULC evolution should be factored in the study of future regional air quality. Other than land use, land cover, and land management changes (LULCCs and LMCs) discussed here, changes in climate conditions and anthropogenic pollutant emissions (e.g. due to “clean air” policies) directly and indirectly influence air quality and interact in a non-linear fashion with LULC and LMCs; for this reason the climate–emission–land system should be considered as a whole when studying changes in surface O3 and aerosols.

3.2.2 Agriculture intensification

The main aim of agricultural management is to increase productivity and therefore has an immediate effect on the agricultural ecosystem functioning (Tillman et al., 2002). Most of these agricultural practices will also have direct or indirect impacts on the environment other than the biosphere (e.g. atmosphere, water, soils) (Sutton, 2011). Agricultural intensification also enhances the export of organic matter from the affected ecosystems with consequences such as the reduction of carbon and nitrogen cycling and soil degradation and erosion (Mattson et al., 1997; Ruysschaert et al., 2004). Examples of agricultural intensification are the conversion of pasture or grasslands into agricultural land or including rotations of agricultural and grasslands.


From a physical perspective, among land management practices, irrigation is one of the most common all over the world, and it significantly modifies the surface water and energy budget. The amount of additional water put into the soils tends to increase the latent heat flux at the expense of sensible heat flux, leading to an irrigation cooling effect (ICE) of the ambient air. In California, for example, this effect was observed during daytime over a long-term dataset and estimated to several degrees (−1.8 to −3.2C since the beginning of irrigation – Lobell and Bonfils, 2008; Bonfils and Lobell, 2007). However, there are two opposite indirect heating effects. First, the high-albedo desert is converted into a low-albedo vegetated plain (Christy et al., 2006), which results from a combination of crop planting and irrigation and can therefore be classified as a land cover change rather than an agricultural intensification. Second, the greenhouse warming is enhanced due to the increase in water vapour. The greenhouse effect is less important than the transpiration effect on temperature and dominates during the night-time. Several modelling studies assess both greenhouse and transpiration effects (Boucher et al., 2004; Sacks et al., 2009; Puma and Cook, 2010; Cook et al., 2011, 2015; Kueppers and Snyder, 2012) and highlight that locally the ICE may have partly masked the 20th century climate warming due to increased greenhouse gases (Kueppers et al., 2007). Meteorological studies suggest that irrigation can also lead to an increase in summer cloud cover and precipitation, as observed over the Great Plains region in the United States, downwind of the major irrigation areas (Segal et al., 1998; Adegoke et al., 2003; DeAngelis et al., 2010). In China, paddy cultivation requires water to stay on the ground during the rice-growing season, leading to a moistening of the land surface, an increase in the latent heat flux, and a decrease in the near-surface temperature from May to July in the Sichuan Basin (Sugimoto et al., 2019). Thiery et al. (2017) demonstrated that irrigation influences temperature extremes and leads to a pronounced cooling during the hottest day of the year (−0.78 K averaged over irrigated land). In addition, this impact of irrigation on temperature is not limited to an agricultural environment as the same cooling effect has also been reproduced for urban irrigation in a water-scarce region (Los Angeles area), with the largest influence in low-intensity residential areas (average cooling of 1.64 C) (Vahmani and Hogue, 2015). Affecting soil moisture and surface temperature, changes in irrigation could also affect soil processes and exchanges of greenhouse gases and chemically reactive compounds between the surface and the atmosphere (Liu et al., 2008). Performing irrigation experiments on the Inner Mongolian steppe, Liu et al. (2008) observed a significant sensitivity of the ecosystem CO2 respiration to increased water input during the vegetation period, whereas the effects on CH4 and N2O fluxes were much more moderate. In order to study the impact of irrigation on ozone and pollutants in the Central Valley of California, Li et al. (2016) implemented an irrigation method in the model WRF-Chem and showed an increase in surface primary pollutant concentrations within the irrigation zone. They also calculated an enhancement in the horizontal transport of ozone and other pollutants from irrigated to unirrigated areas near the ground surface. However, few studies have been published so far on this topic from a biological or chemical perspective, and the effect of irrigation on biological processes or on the atmospheric chemical composition therefore remains poorly quantified.


Since the Second World War, the use of synthetic N fertilizers largely increased, with half of the quantity ever used being applied in the last 20 years (Erisman et al., 2007). The growth of nitrogen fertilization threatens water sources (e.g. eutrophication of surface waters, pollution of groundwater, acid rains), soils (e.g. soil acidification), climate via GHG emissions, and air quality.

Few studies have investigated the impact of fertilizer use from a physical perspective, and yet physical interactions between the surface and the atmosphere could be affected. Based on a long-term experiment of fertilizer and amendment application running for 70 years, Pernes-Debuyser and Tessier (2004) observed that physical properties of plots were significantly affected, especially those related to soil–water relations. In spite of the preservation of their porosity, plots became more sensitive to the degradation of their hydraulic properties. Similarly, Hati et al. (2008) showed, in the case of an intensive conventional cultivation in subhumid tropics in India (acidic Alfisols), the importance of soil management practices in maintaining the soil physical environment, with a potential impact on soil aggregation, soil water retention, microporosity, available water capacity, or bulk density.

From a biological perspective, the additional source of nitrogen has different impacts on the atmosphere, mainly linked to an increase in reactive nitrogenous emissions (NH3, NOx) (Fowler et al., 2009, 2013; Galloway et al., 2003) but also in emissions of a GHG such as N2O. Increase in production also affects leaf area index and plant height and therefore surface properties and physical exchanges with the atmosphere. Finally, fertilization also influences soil microbial characteristics and, consequently, exchanges of several gaseous compounds (Marschner et al., 2003; Cinnadurai et al., 2013; Joergensen et al., 2010; Murugan and Kumar, 2013). Grassland usually stores considerable amounts of carbon in the soils, mainly due to a permanent plant cover and to a relatively large below-ground biomass (Bouwman, 1990; Casella, 1997). However, the amount of stored carbon and the emission of greenhouse gases depend on the management of this grassland (ploughing, fertilization, pasture, etc.) (Soussana et al., 2004; Lal, 2004) and on climatic conditions (Hu et al., 2001). Some studies suggest that increased nitrogen fertilization can enhance C storage in grassland. Conversely, nitrogen fertilization increases leaching and emissions of N2O and other nitrogen species (e.g. NH3, NO) to the atmosphere, with negative consequences on air quality (Flechard et al., 2005; Senapati et al., 2014; Chabbi et al., 2015).

From a chemical perspective, the increase in NH3 emissions to the atmosphere can have a serious impact on air quality through the formation of secondary organic aerosols. Agricultural practices and techniques that reduce the evaporation of manure and urea and the use of N fertilizers help in lowering ammonia emissions from agriculture as documented in Europe, where 90 % of the total ammonia emissions come from agriculture (−9 % over 1990–2002; Erisman et al., 2008). In China, where N fertilizer application rose by 271 % over the 1977–2002 period, with an increase of 71 % only in grain production (Ju et al., 2009), Ju et al. (2009) suggested reducing N application rates by 30 %–60 %. This agricultural management practice would still ensure crop yields and N balance in between rotations and would reduce economical costs for farmers, while substantially reducing N losses to the environment.

Soil surface conditions

From a physical perspective, several crop management techniques (e.g. cover crops, double-cropping, no tillage) have a direct effect on regional climate through changes in surface–atmosphere fluxes and surface climate conditions, and are considered among geoengineering options. When tillage is suppressed, crop residues are left on the field, resulting in two counteracting mechanisms: albedo increases while evaporation reduces (Lobell et al., 2006; Davin et al., 2014; Wilhelm et al., 2015). Surface albedo increases by 10 % and lowers hot temperature values by about 2 C; however the effect on the mean climate is negligible. Climate effect of two growing seasons per year has been largely untested. Only Lobell et al. (2006) have shown via modelling that this experiment has a small impact on temperature on multi-decadal timescales when compared to practices as irrigation. However, more recently Houspanossian et al. (2017) have observed through satellite imagery a difference in reflected radiation between single and double-cropping of up to 5 W m−2. Similar to a tillage/no-tillage mechanism, differences over South America were induced by a longer fallow period in the simple cropping case. Seed-sowing dates also likely plays a role in surface energy balance, due to the modification of the growing season length (Sacks and Kucharik, 2011).

Among agriculture practices, as an alternative to biomass burning and natural decomposition, the use of charcoal from biomass pyrolysis to enrich soils may reduce CO2 emissions. However, as a side effect, the resulting darker soil increases the local radiative forcing through albedo change and offsets the sequestration effect up to 30 % according to Bozzi et al. (2015), who carried out the analysis based on observations of agricultural field albedo. Biochar has similar effects (Usowicz et al., 2016; Meyer et al., 2012).

From a chemical perspective, fallow lands are potential sources of dust and coarse aerosols (PM10), especially in regions where gusty winds dominate. Insufficient crop residues on the surface and finely divided soils by multiple tillage operations expose fallow land to wind erosion, thus contributing to poor air quality (López et al., 2000; Sharrat et al., 2007). In addition, wind erosion is likely to reduce crop yields by removing the richest fraction of soils, reducing the water-holding capacity of soils and enhancing soil degradation. Compared to conventional tillage (i.e. mouldboard ploughing followed by a compacting roller), alternative or reduced tillage practices (e.g. chisel ploughing) prevent wind erosion during fallow periods in semiarid Aragon (López et al., 2007). In addition, reduced tillage improves soil protection by lowering the wind-erodible fraction of soil surface (−10 %), increasing fraction of soil covered with crop residues and clods (+30 %), and enhancing soil roughness (15 % compared to 4 % under conventional tillage). These agricultural practices therefore have the potential to modify aerosol sources by modifying the state of surfaces.

From a biological point of view, the conditions of the soil surface and the management of crop residues highly affect soil quality as well as the functioning and the abundance of soil microorganisms (Smith et al., 2015, 2016). In terms of exchange with the atmosphere, this results in soil structural changes affecting soil porosity and directly influencing the emissions of NOx and BVOCs (Gray et al., 2010; Bertram et al., 2005). Effects can also be seen on soil organic matter content and degree and rate of decomposition therefore affecting emissions of several nitrogen compounds therefore affecting GHG balance (emissions of N2O vs. storage of carbon) (Xia et al., 2018) and air quality (NH3, NOx emissions) (de Ruijter et al., 2010). Conversely, soil surface conditions also influence the deposition of O3 (Stella et al., 2019) and potentially other highly reactive atmospheric compounds such as pesticides (Alletto et al., 2010).


Fire is still largely used as a traditional agricultural practice (e.g. slash-and-burn agriculture, pest control, promotion of the growth of fresh grass for grazing) and to convert forests to pasture/croplands, especially in tropical regions (Yevich and Logan, 2003). On a local scale, intensive mechanized grain agriculture reduces the use of fire. However, the wealth generated from intensive agriculture may be reinvested in traditional extensive land uses that promote fire (Wright et al., 2004).

Generally, fires can impact soil colour, pH, bulk density, and soil texture, and are therefore critical for physical surface–atmosphere exchanges, together with biological properties of soil such as species richness and microorganism content (Thomaz et al., 2014; Verma and Jayakumar, 2012; Savadogo et al., 2007). However the impact of fires from a physical or a biological perspective has been poorly investigated, especially regarding the long-term effect (Dooley and Treseder, 2012; Pressler et al., 2019).

From a chemical perspective, fire has impacts on both photochemical pollution (O3 production) and aerosol loading. During fire episodes, O3 production switches from a VOC-sensitive regime in nascent smoke plumes (i.e. first hours of burning and close to the ignition point) to a NOx-sensitive regime as the plume ages. In nascent smoke plumes NOx levels are high and photochemical activity is low. Smoke plume ageing decreases NOx levels via atmospheric dilution and chemical reactions, resulting in increased O3 production (e.g. Jost et al., 2003; Trentmann et al., 2003; Yokelson et al., 2003; Mason et al., 2006; Singh et al., 2012). During fire episodes, O3 levels may reach hazardous values, with the 8 h average O3 concentration often exceeding air quality standards (around 50–75 ppbv; Bytnerowicz et al., 2010). Fires also release huge amounts of both coarse- and fine-mode aerosols, leading to concentrations that largely exceed background levels (Phuleria et al., 2005; Hu et al., 2008) and that substantially affect visibility (Val Martin et al., 2015). Over Singapore, Indonesian fires caused the average daily minimum horizontal visibility to decrease, firstly, to less than 2 km, and later to 500 m (Goldammer et al., 2009). Fire emissions encompass aerosol precursors such as NH3 and BVOCs as well.

Forest management

Forest management mainly relies on tree species selection, fertilization, litter raking, thinning, and clear-cutting (Eriksson et al., 2007), together with planting and harvest types, burning, and understory treatment.

From a physical perspective, along with crop management, forest management could have a similar impact on local climate but is still poorly investigated (Bellassen and Luyssaert, 2014; Luyssaert et al., 2014), although forested areas cover one-third of the global land surface (Klein Goldewijk, 2001). The large conversion of broadleaved to managed conifer forest resulted in biogeophysical changes, which contributed to higher temperatures instead of attenuating them.

From a biological perspective, through modelling, Naudts et al. (2016) showed that 2.5 centuries of forest management in Europe may not have mitigated climate warming, contrary to what was sometimes assumed until now. With regard to atmospheric carbon budget, forests were altered from acting as a carbon sink to a carbon source because of the removal of litter, dead wood, and soil carbon pools.

From a chemical perspective, by modifying the surface characteristics, forest management can change sources and sinks of reactive compounds, and therefore affect air quality. Conversely, forest management can also be a tool when targeting air pollution reduction. Using a coupled-model approach, Baumgardner et al. (2012) analysed the improvement of air quality by a forested peri-urban national park in the Mexico City megalopolis and underlined that their results can be used to understand the air quality regulation potentially provided by peri-urban forests as an ecosystem service, together with the regional dynamics of air pollution emissions from major urban areas.

3.3 Synthesis of current knowledge

In the context of LULCCs and LMCs, the importance of land–atmosphere interactions for climate and air quality has been analysed in many studies published over the past 2–3 decades, exploring a large range of scales. We summarize here the current state of knowledge emerging from the articles we reviewed. For each of the LULCC categories (land cover change, agricultural intensification, urbanization) considered in this article, the direct and cascading effects on the physical, biological, and chemical processes are synthesized in Table 2.

Table 2Synthesis of direct and indirect effects of land use and land cover changes as well as land management changes as seen from a physical, biological, or chemical perspective.

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Regarding physical processes, the works published so far on deforestation and afforestation mainly apply a modelling approach where the different processes involved (surface albedo, radiation, energy budget, etc.) are overall well understood. These works compare the effects between current and pre-industrial (potential) vegetation, representative of a time period with few (no) human activities. There is no single/simple response to these LULCCs as the sign and amplitude of the effects on temperature and precipitation depend on the latitude, on the pre-/post-vegetation types, and the landscape configuration. The effect on air temperature remains mainly unclear in most temperate regions, as this is where changes in the radiative budget compete with changes in the hydrological cycle. Regarding wetland drainage for agricultural purposes, very few studies investigate its impact on local and regional climate, in spite of the size of the areas affected. Via a modelling approach, existing studies show contrasting effects of wetland drainage on daily temperatures. Among agricultural management practices, irrigation is largely used all over the world and its impact on climate has been discussed in several studies using both observations and modelling. These works analyse both the greenhouse and the transpiration effect of irrigation, and suggest that the local cooling of irrigation might have partly masked the 20th century climate warming at regional scales. The potential impacts on local to regional climate of other agricultural management practices, such as field preparation for planting, charcoal use for soil enrichment, or forest management, remain poorly investigated but existing studies suggest their impacts on specific seasons and on climate extremes may be significant. UHI effect on climate is largely analysed in the literature, and the reasons for a warmer climate are explained by a change in the surface radiative budget, a less efficient energy dissipation due to less convection, and heat release by human activities. However, the overall impact significantly varies depending on the time of the day, season, human activities, geographical location, and spatial organization of the urban fabric. Moreover, almost no studies refer to realistic landscapes and realistic changes, with potential compensation or amplifying effects. This is a challenge ahead as existing studies may not yet provide enough information to anticipate the impacts of realistic land use scenarios.

Whatever the land change described above, there is much numerical evidence that its effect on extreme weather/climate events is quite larger than its impact on mean seasonal or annual climate.

Focusing on central France, for example, Stéfanon et al. (2014) demonstrated that if this part of France had been partially afforested in 2003, the June heatwave would have been aggravated by up to +3C, while the August one would have been dampened by as much as −1.6C locally.

Enhanced extreme winter cold temperatures and lengthening of frosts have also been identified by Marshall et al. (2004a) in response to the drainage of wetlands and replacement by agriculture in Florida. By altering extreme conditions rather than the mean regional climate, these LULCCs have been responsible for reduced crop yields in the region.

Pitman et al. (2012a) carefully carried out a multi-model analysis at the global scale of the impacts of historical land cover changes on extreme temperature and precipitation indices (using the indices recommended by the CCl/CLIVAR/JCOMM Expert Team on Climate Change Detection and Indices, ETCCDI, based on daily maximum and minimum temperature and daily precipitation). They found that wherever the land cover change induced a decrease (increases) in averaged temperature, the extreme temperatures were also reduced (increased). By comparing the LULCC-induced changes to those resulting from the increase in atmospheric CO2 and sea-surface temperatures during the same historical period, the authors found that the LULCC-induced changes may be as large as changes triggered by global warming, sometimes even larger, and potentially of opposite sign.

Any land cover conversion or land management that favours the increase in (or reversely the decrease in) evapotranspiration during a specific season (e.g. irrigation, crop intensification versus deforestation, tillage suppression) has consequences on extreme daily temperatures, without affecting the mean seasonal temperatures. LULCCs and LMCs generally reduce maximum temperatures (Tmax) and thereby reduce the diurnal thermal amplitude (Davin et al., 2014; Thiery et al., 2017).

Focusing on biological processes, several studies show that, via changes in temperature and soil moisture, deforestation affects nutrient mineralization in soils by enhancing carbon and nitrogen release to the atmosphere and the environment. Some of the released gases have a significant warming potential (CO2, CH4, N2O, for instance) or they are involved in the ozone cycle or aerosol formation (e.g. emissions from fire clearing). These compounds can affect the climate at local, regional, or global scales. Several studies show that peatland and wetland conversion affect climate from the local, through evaporation and surface temperature change, to the global scale, by changing surface emissions of greenhouse gases such as CO2 or CH4. Impacts of agricultural management on climate and air quality are widely investigated via modelling or experimental studies at the local scale; however, very few studies investigate the impact of agricultural management on climate through changes in biological processes at the landscape, regional, or global scales. Land use intensification and fertilization are shown to have the potential to affect climate, through modification of greenhouse gas emissions and carbon sequestration, but also on regional air quality via the emission of different reactive species such as NH3, NOx, and several VOC species. This highlights the complex interactions and feedbacks between chemistry and biology, such as the interactions between ozone and reactive nitrogen in the context of their mutual impacts on ecosystems. Key results showed that exposure to ambient O3 concentrations was reducing the nitrogen use efficiency of plants, both decreasing agricultural production and posing an increased risk of other forms of nitrogen pollution, such as nitrate leaching (NO3). Ambient levels of aerosols were also demonstrated to reduce the ability of plants to conserve water under drought conditions. These results clearly show the tight interactions between the atmospheric chemical composition and the ecosystem and agroecosystem functioning, with a strong need for further model adaptation and investigations.

At last, by affecting surface emissions and atmospheric chemical processes, LULCCs and LMCs have the potential to affect air quality, by changing air pollutant concentrations, and the local-to-global climate, by modifying greenhouse gases (O3, CH4, CO2, etc.) or levels of radiative compounds (e.g. aerosols). Most of the studies published so far apply a modelling approach and analyse the impact of regional- or large-scale changes in land cover on land–atmosphere chemical interactions (deforestation in tropical areas, preindustrial to present day or future changes in vegetation distribution, etc.). The increase in biofuel and oil palm plantations for energy and food production has been targeted by several studies. Among the different agricultural practices, fertilization, agriculture fires, and fallow periods have been shown to affect air quality by emitting ammonia, ozone precursors, and/or aerosols. However, the impact of land and agricultural management on air quality, and potentially climate, through changes in land–atmosphere chemical interactions, remains poorly investigated. An increasing number of studies assessed the impact of urbanization on land–atmosphere chemical interactions and air quality, with an increasing interest in the impact of urban trees on ozone pollution, through changes in BVOC emissions.

4 Interactions between different land cover, uses, and managements over a mosaic landscape: impacts on land surface exchanges
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In the real world complexity arises where territories are composed of a mosaic of very diverse landscapes in which physical, biological, and chemical processes take place and interact altogether. Areas of agricultural surfaces, covered by different types of crops and cattle, forests composed of a varying mixture of plant types, and urban and peri-urban areas of different sizes co-exist next to each other, sharing one single atmosphere with no boundaries. Therefore, one homogeneous parcel has the potential to influence surrounding ones, over a range of time and geographic scales that will depend on considered processes, as illustrated in Fig. 4. Horizontal transport of air masses promotes water, heat, or pollutant exchanges between surrounding areas. Regarding air quality, compounds emitted from one area can be transported to remote places, depending on their lifetime, undergo chemical transformations in the atmosphere, and consequently influence the chemical composition of the air in distant regions. In this section, we will draw an overview of possible interactions between physical, biological, and chemical processes, and we will analyse them over a mosaic of landscapes from three different perspectives: local climate, air quality, and ecosystem functioning. These changes and interactions ultimately modify local climate and air pollution as specified in Sect. 3.

Figure 4Interactions between different land uses and major trend of gaseous flux direction from each land use type. Different colours represent different scalars. Monodirectional arrows indicate where scalars are mostly emitted or deposited by the land use. Bidirectional arrows indicate where scalars can be emitted or deposited depending on atmospheric and ecosystem conditions.


4.1 Local to meso-climate perspective

Horizontal advection from one LULC to another can significantly modify local climate downwind. For instance, urban areas not only heat their local environment but also their surroundings due to horizontal transport of warm air masses to suburban and rural environments. As reported by Bohnenstengel et al. (2011), suburban areas downwind of London are 1 C warmer during night-time than upwind ones due to heat advected from the city centre. Similarly, Heaviside et al. (2015) found that temperatures downwind of Birmingham were up to 2.5 C warmer than those upwind during the heatwave of August 2003. Sarrat et al. (2006) found that temperatures in suburban areas were 1.5 C warmer when including the UHI effect in their simulation than without considering it. They also highlighted that UHI is displaced to suburban areas by horizontal advection and forms an urban heat plume. This effect can extend to about tens of kilometres downwind (Brandsma et al., 2003; Bohnenstengel et al., 2011). However, this issue is closely linked with wind speed (Kim and Baik, 2002; Brandsma et al., 2003): a minimum wind speed (>0.1 m s−1) is required for urban heat advection to become effective, while for larger wind speeds (>5 m s−1) the mixing of the heat plume with the overlying atmosphere decreases this effect (Brandsma et al., 2003).

Moreover, spatial heterogeneities induced by LULCCs are likely to produce atmospheric circulations – similar to the sea/lake breeze (so-called non-classical mesoscale circulations) – or to modify the magnitude of pre-existing background wind, as documented experimentally (Briggs, 1988; Mahrt et al., 1994) as well as numerically (Mahfouf et al., 1987; Hadfield et al., 1992; Shen and Leclerc, 1995; Avissar and Schmidt, 1998; Stohlgren et al., 1998). Heterogeneities of surface properties and heat fluxes over contrasting areas are the main and required criteria for this mesoscale process (Anthes, 1984; Segal et al., 1988) that can generate over bare soil-vegetated areas, irrigated–unirrigated regions, urban–rural areas, or mountain–valley structures (Avissar and Pielke, 1989). Distribution of heating at scales of the order of tens of kilometres is necessary to initiate such circulations (André et al., 1990; Mahrt and Ek, 1993; Segal and Arrit, 1992; Wang et al., 2000). The generation of mesoscale circulations carries heat and water vapour, which have a significant influence on the planetary boundary layer dynamics and properties (temperature, water vapour, cloudiness, and vertical heat flux) (Anthes, 1984; Segal et al., 1988; Avissar and Liu, 1996; Avissar and Schmidt, 1998). For instance, deforestation upwind of montane forests results in warmer and drier air, which induces thinner clouds and a reduction in air humidity (Nair et al., 2003; Ray et al., 2006). Conversely, downwind of heavily irrigated areas, a rainfall increase of 15 %–30 % was observed over the US Great Plains (DeAngelis et al., 2010). Finally, although it is clear urban areas alter rainfall events in their surroundings (Shepherd, 2005), it is difficult to precisely assess the localization and magnitude of induced rainfall events. For instance, Shepherd et al. (2002) reported that the maximum rainfall rates were between 48 % and 116 % larger downwind of the city than upwind, while Dou et al. (2015) found that minimum rainfall occurred directly downwind of the urban area (up to −35 %), whereas the maximum values occurred along its downwind lateral edges.

4.2 Ecosystem functioning perspective

It has long been acknowledged that simultaneous interactions exist between landscape organization, structure, and biological functioning. Human activity also plays a major role in regulating and shaping those dynamic biogeophysical interactions at the landscape level. Organisms not only respond to their physical environment, but they also directly modify and control their physical environment in ways that promote their own persistence. Several scientific disciplines such as “ecological stoichiometry” (Sterner et al., 2017), “ecosystem engineering” (Jones et al., 1994), and “biodiversity and ecosystem functioning” (Loreau et al., 2002) illustrate how living organisms shape their own environment through biogeochemical alteration in a multidimensional environment. These different interactions between animals, vegetation and physical and chemical processes can be illustrated through different examples such as alteration of soils and water quality, seed and spore dispersal, and competition for soil, moisture, and light (Hastings, 2004).

There are several examples in non-anthropized environments, which show the feedbacks between macrofauna, vegetation, soil formation, sediment transport, and ultimately landscape formation. For example, Van Hulzen et al. (2007) demonstrated how certain plant species both modify their habitat via their own physical structures and respond to those modifications. The plant modifies its environment so that it becomes more locally favourable. However, these modifications create small “islands”, therefore limiting the plant from spreading. There is a consensus that climate-driven changes in precipitation will influence the pattern and vegetation type (and animals) in landscapes, which will in turn influence physical processes. However, today, human activity mainly shapes the landscape we live in. For example, high inputs of fertilizers and pesticides degrade the habitat quality, while the expansion of arable lands promotes widespread landscape homogenization (Robinson and Sutherland, 2002). Studies over the last 2 decades have emphasized the importance of landscape-scale effects in these processes (Benton et al., 2003; Hole et al., 2005; Matson et al., 1997; Swift et al., 2004; Vandermeer et al., 1998).

Biological processes respond differently based on landscape structure. For example, Vinatier et al. (2012) showed that pest dispersal may be of greater importance in fragmented rather than homogenous landscapes. By considering the link between ecological processes and landscape composition, one can therefore evaluate the impact of habitat loss and fragmentation due to human activity on different population dynamics (Wiegand et al., 2000, 2005; Fahrig, 2003). In this context, some results are sometimes contradictory. Roschewitz et al. (2005) and Thies et al. (2005) found that complex landscapes, characterized by a higher proportion of semi-natural habitats, increase aphid parasitism rate but also aphid abundances. Conversely, studies by Caballero-López et al. (2012), Costamagna et al. (2004), Menalled et al. (2003), and Vollhardt et al. (2008) showed that landscape complexity has no effect on parasite diversity.

Another critical issue linked to ecosystem functioning and landscape structure is soil quality. Montgomery (2007) showed that conventionally ploughed fields generally erode at rates typical of alpine terrain under native vegetation. However, LULCCs are not only the cause but can also be the consequence of erosion processes (Bakker et al., 2005). Landscape alteration also influences nitrogen availability through its impact on organic matter through fire (Mataix-Solera et al., 2011; Debano and Conrad, 1978), tree fall (Schroth et al., 2002; Mladenoff, 1987; Vitousek and Denslow, 1986; Muscolo et al., 2014; Feldpausch et al., 2011), and forest practice (Fujisaki et al., 2015; Guimarães et al., 2013; Berenguer et al., 2014; Bormann and Likens, 1979; Vitousek and Matson, 1985), which all produce patchy landscapes. Soil nitrogen alterations can have important immediate consequences for N cycling as volatilization, recycling of organic matter from aboveground biomass, reduced uptake by plants, altered rates of solution transport through the soil profile, and elevated mineralization. These disturbances can indirectly affect the ways in which different species colonize disturbed areas and recycle N. Over longer periods, the species composition resulting from disturbance might affect nutrient supply and influence total carbon and N pools, element ratios, and pH (Zinke, 1962; Wagle and Kitchen, 1972; Christensen and Muller, 1975; Christensen, 1977; Raison, 1979; Boerner, 1982).

Proximity of a natural ecosystem to an urban area also alters this ecosystem functioning as it has been shown through several studies. As mentioned above, air quality and more precisely ozone concentrations affect leaf photosynthesis and therefore ecosystem production. The degradation of ecosystems in proximity with big cities has been studied mainly in the perspective of analysing the effect on ecosystem services and the subsequent effects on populations in general and vulnerable populations in particular (Elmqvist, 2013; Haase et al., 2014).

4.3 Air quality perspective

As illustrated in Sect. 3, LULCCs and LMCs directly influence the local air pollution via changes in the intensity and variability (temporal and geographical) of chemical emissions (e.g. BVOCs from tree species, NOx emissions from soils and fertilization) or in chemical processes and regimes (e.g. from NOx- to VOC-sensitive regimes in O3 production). In addition, by modifying land–atmosphere interactions, LULCCs and LMCs can indirectly affect air quality by altering atmospheric circulation (i.e. vertical mixing and advection) with consequences for the dispersion of pollutants and of pollutant precursors.

Pollutant dispersion in the planetary boundary layer (PBL) is strongly influenced by changes in the PBL height and in convective transport, which are triggered in turn by modified land–atmosphere energy transfer (Ganzeveld and Lelieveld, 2004; Civerolo et al., 2007; Rendón et al., 2014; Wagner and Schäfer, 2017). Intense convection makes the PBL deeper; this condition, together with enhanced advection, increases pollutant dispersion. In the troposphere, O3 and secondary aerosol production depends on the abundance of their precursors (i.e. NOx and VOCs). Increased dispersion may reduce concentrations of precursors, finally reducing ozone production. Conversely, stagnant atmospheric conditions often associated with low advection and strong thermal inversion, limit pollutant dispersion and favour O3 production.

Stagnant atmospheric conditions correspond to low winds, intense solar radiation, and high surface temperatures. Under these sunny and warm conditions, O3 production increases because of the direct effect of altered radical production and photochemistry (Fiore et al., 2012) and the indirect effect of enhanced BVOC emissions (e.g. Cardelino and Chameides, 1990; Taha, 1996; Val Martin et al., 2015). At the urban scale, Cardelino and Chameides (1990) estimated a rise of 25 % in BVOC emissions due to warmer temperatures, in spite of a decrease in forest areas by 20%, due to growing urbanization. In terms of O3 production, increased BVOC emissions ruled out the benefits of a substantial reduction in anthropogenic VOC emissions (−50 %) via “clean air” policies. Enhanced BVOC emissions may also feed the aerosol loading via BSOA production (e.g. Cardelino and Chameides, 1990; Nowak et al., 2000). The influence of atmospheric conditions on the aerosol loading depends on the aerosol type. Nitrates dominate under cold temperatures, while sulfates prefer warm temperatures. Hygroscopic aerosols benefit from high humidity. For most aerosols, the precipitation rate directly controls the aerosol loading since scavenging (wet deposition) is the main sink for aerosols.

Surface roughness and vegetation conditions (i.e. plant type, plant health, heat stress) strongly affect both aerosol and O3 dry deposition. Ozone deposition involves biological processes and decreases with decreasing surface and leaf wetness (Klemm and Mangold, 2001). When vegetation is not water-limited, ozone can be absorbed by leaves via stomatal uptake. Above a certain threshold, O3 deposition reduces photosynthesis, plant growth, biomass accumulation, and crop yields, and affects stomatal control over plant evapotranspiration (Ainsworth et al., 2012). Hence, although O3 deposition by stomatal uptake improves air quality, it may result in plant damage in the long term. Ozone deposition also depends on mechanical processes. By increasing surface roughness, trees reduce horizontal wind speeds and limit pollutant dispersion, leading to increased ozone levels both locally and regionally (e.g. Nowak et al., 2000). Conversely, reforestation of croplands (Trail et al., 2015) or vegetation increase in urban areas (Taha, 1996) improves O3 deposition and reduces O3 concentration. This ozone-reducing mechanism combines with other afforestation-driven effects, such as reduced NOx emissions from soils and fertilization and lower surface temperatures, and competes with higher BVOC emissions from trees, which may trigger O3 production (Trail et al., 2015). Ecosystem distribution can also be a significant driver of deposition efficiency, which is still not well quantified. A shift from croplands to grasslands reduces dry deposition velocity and increases ozone concentration (Val Martin et al., 2015). Taking into account the 2050 RCP 8.5 vegetation distribution, which is characterized by an expansion of land used for crops and pastures at the expense of forests, Verbeke et al. (2015) calculated a rise in the surface ozone deposition velocity, relative to the present-day values, up to 7 % in tropical Africa and up to +18 % in Australia. Moreover, although pollutant deposition on trees significantly reduces ozone levels, this effect is hampered as the PBL height increases (Nowak et al., 2000). Conversely, a conversion from forests to croplands modifies stomatal activity and affects deposition rates of trace gases, such as ozone, more than changes in leaf area index (LAI; Trail et al., 2015). Furthermore, for aerosols, conversion from forests to croplands reduces aerosol dry deposition because of decreased surface roughness. In cities, promoting green infrastructures has been considered a tool to improve air quality, but their actual impact on the atmospheric chemical composition is only quantified in a few studies (Churkina et al., 2017; Ren et al., 2017). A recent review by Abhijith et al. (2017) shows that the choice of infrastructure is critical, with, for instance, low-level green infrastructure (hedges) improving air quality compared to high vegetation canopies.

To summarize, LULCCs and LMCs affect air quality directly, by influencing the sources and sinks of reactive compounds at the surface, and indirectly, by modifying environmental conditions (temperature, mixing) in which surface–atmosphere chemical exchanges occur. By modifying the air chemical composition and possibly affecting the occurrence of pollution episodes, changes described so far have the potential to affect, in turn, vegetation distribution and growth. Consequently, these changes could also retroactively affect physical and biological processes involved, with potential impact on meteorological conditions and climate, at the local and regional scales. To investigate future air quality, future LULCCs and LMCs should be accounted for in meteorological models that provide forcing to chemical-transport models. If not, projections of future air quality will not account for the indirect influence of land–atmosphere interactions on the evolution of air quality (Civerolo et al., 2000).

5 Future research
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In Sect. 3 we have reviewed recent progress, from both an experimental and modelling point of view, in our understanding of processes and mechanisms involved in land–atmosphere interactions at different scales, going from organ to plant, from plot up to regional scales. In Sect. 4 we have discussed studies focusing on the interactions between the different landscape structures that affect local climate and air quality. Through these analyses, we have highlighted that the representation of interactions and feedbacks between the different compartments (physics, biology, chemistry) and surfaces (urban, peri-urban, agricultural, natural, etc.) is crucial when investigating the impact of LULCCs on climate from small to larger scales. Based on these analyses, in the present section we identify actual knowledge gaps in the processes, feedbacks, methodologies, and parameterizations currently used to reproduce interactions between land, LULCCs, and the atmosphere. Below we summarize the limitations that exist today and that restrain our capacity to investigate the effects of LULCCs and LMCs on local climate and air quality at different scales using a modelling and/or an experimental approach, while considering all the interactions involved.

5.1 Challenges ahead

The first challenge is the lack of integration between the different known processes. It is not easy to design an experimental protocol that allows us to differentiate between the impacts relative to each different process (Pitman et al., 2012b). Although several initiatives are being conducted to couple model and ecosystem based experiments to allow disentangling of processes and better model performance (ex. Norby et al., 2016; Medlyn et al., 2015), it is still a big challenge today (Higgins, 2017). Nearby urban areas, for example, strong pollution levels – with especially high ozone concentration – may directly affect plant productivity through atmospheric advection of those pollutants downwind from the city. In such a case, surface and air temperature may be perturbed in rural regions through changes in vegetation characteristics (e.g. stomatal opening, albedo) and fluxes (e.g. latent heat flux). A coupled land–atmosphere model that does not account for chemistry processes will therefore not be able to correctly reproduce surface climate and vegetation status in the rural environment. In addition, the representation of urban areas is often very simplified. For instance, regarding atmospheric chemistry, emission sources are usually prescribed, which do not allow us to account for feedbacks. Hence, a coupled urban–vegetation–chemistry model is a necessary development, as also pointed out by Baklanov et al. (2014) in their review of online modelling of atmospheric and chemical conditions (i.e. online modelling refers to the numerical technique of having atmospheric and chemical conditions evolve in parallel with the atmospheric and the chemical modules exchanging information in the two ways at each time step).

Figure 5a illustrates the interactions between the different variables and processes involved in biosphere–atmosphere exchanges as discussed in the previous sections (that are not exhaustive with respect to the existing literature). Today most of these interactions (solid lines) are relatively well known but are not yet experimentally measured or jointly accounted for in regional global climate models, which we are targeting here. Whereas global climate models, such as those used for the Coupled Model Intercomparison Project (CMIP) exercises for the Intergovernmental Panel on Climate Change (IPCC), are now referred to as Earth system models (ESMs) that include a large spectrum of physical, chemical, and biological processes in the modules that describe the atmosphere, biosphere, and hydrosphere reservoirs, regional climate models have recently started to move towards the frontiers of regional ESMs (e.g. Sitz et al., 2017).

Figure 5Interactions between the different variables and processes (a) concerned in biosphere–atmosphere exchanges as well as feedbacks (b) involved between the physical and biological surfaces of an ecosystem and the physical and chemical compartments of the adjacent atmosphere. Full arrows represent well-documented processes and feedbacks; dashed arrows represent mechanisms having knowledge gaps or badly represented in most models. Nr stands for reactive nitrogen species, Ta for air temperature, RH for air relative humidity, U for average wind speed, VOC for volatile organic compounds, Ts for surface temperature, Rs for stomatal resistance, net primary production (NPP) for net primary production, and LAI for leaf area index. This schematic covers most atmospheric variables discussed in the paper, but not all atmospheric variables that can be affected. Rainfall and cloudiness for example are amongst the ones that have been shown to be sensitive to land and are not discussed herein.


The second challenge relies on the detailed representation of the variety of surfaces in the above-mentioned models. Indeed, surfaces such as cities, managed forests, mixed areas, wetlands, or the variety of agricultural crops are oversimplified (e.g. no distinction of forest species in a forest biome), misrepresented (e.g. crops represented as a super-grassland), or absent (e.g. absence of wetland representation). Such gaps could be potentially bridged by using more sophisticated dynamic global vegetation models (DGVMs) than those currently used in climate models. In their analysis of DGVMs, Scheiter et al. (2013) pinpointed some of the limits of the current generation of DGVMs such as, for instance, the use of bioclimatic limits to force the modelled vegetation type to grow under the “correct climate” (the one that will guarantee the selected vegetation type to grow), or the parametrization of the number of species and the degree of functional diversity that is necessary to sustain ecosystem function. The authors tested, in a trait- and individual-based vegetation model, some of the new concepts that could fit in the next generation of DGVMs (e.g. assembly theory) and coexistence theory. Moreover, DGVMs could be coupled to chemistry models to gain a better description of the land surface as well as of the land management practice If such DGVMs may include the impact changes in air quality have on the functioning of the ecosystems they model, the reverse is not true. Most chemistry and transport models, for example, consider prescribed and fixed information for vegetation (distribution, areas, related characteristics such as leaf area index, stomatal resistance, etc.) and as well for land management and farming practices, which are relatively scarce at the regional and global scales. As this information is used to calculate emissions and deposition, it can strongly affect the assessment of atmospheric chemical composition. Therefore, the numerical coupling between atmospheric chemistry and the terrestrial biosphere, or at least a more dynamic representation of vegetation in chemistry-transport models (Baklanov et al., 2014), is a crucial step forward in the development of integrated numerical tools. Coarse-resolution models (e.g. global scale, ∼100 km) may be inadequate in separating different chemical regimes that are triggered by emission patterns of biogenic and anthropogenic sources. However, today, the integration of such loops in numerical models is limited because the various components of these interactions are developed by independent groups, in diverse surface models that are not all coupled to atmospheric models. This is of high importance, especially in short- or long-term conditions where LULCCs and climate are meant to change significantly under the influence of human activities. For instance, the variety of plant species encompassed in a BVOC emission database is limited (e.g. Ashworth et al., 2012), with therefore incomplete information regarding emission geographical variability. This biases both the ability to describe and to properly evaluate BVOC emissions in modelling tools. Green roofs in urban–atmosphere models are generally represented through uniform, idealized vegetation, while ecological papers have shown a large variability in the vegetation response to climate, depending on species. Not accounting for such biodiversity may affect the ability to calculate the exact cooling effect of those roofs. Moreover, studies often target emissions from a single sector (e.g. oil palm industry, biofuel production) without taking into account emission evolution in other sectors (other than oil crop/biofuel industry) or in nearby regions (e.g. Hewitt et al., 2009). The exclusion of emission sources other than those from LULCCs and LMCs may affect results (over- or underestimate) regarding ozone and aerosol levels. For example, most large-scale modelling studies use global vegetation models to investigate the interactions between the chemistry and the biosphere and adopt a simplified representation of ecosystems as a selection of plant functional types (PFTs). The PFT approach lumps individual plants with similar ecological characteristics and behaviours under the same vegetation type. Although the PFT approach works at the global scale, once applied at the regional scale it may restrain the model skills in representing the ecosystem variability as well as the land management scenarios, which are often not accounted for in the models, as also pointed out by Scheiter et al. (2013).

The third challenge is the need for observational data covering more temporal and spatial scales. For example, various observations of BVOC or reactive N compound emissions have been published for European and North American ecosystems, while few observational studies target southern regions. Due to the absence of such a dataset, it is complicated to perform robust evaluation of models at the adapted scales, as also pointed out by Arneth et al. (2008). There is obviously a missing link between the regional scale, at which most chemistry and transport models are run, and local scales, where observations are collected. Such investigations could also help to improve parameterizations generally used in models. The dependency of certain processes on different plant species and pedo-climatic regions is indeed generally not well described in model parameterizations.

Lastly, some processes are known but are not yet implemented in models. Figure 5b represents the existing known feedbacks between the different compartments. The feedbacks between the biosphere and the atmosphere via the impacts of vegetation on chemistry (dashed lines) are an example of missing processes in the majority of models. For example, bidirectional exchange of reactive N compounds is well known today but few chemistry and transport models fully integrate N exchanges, although some advances have been made concerning ammonia (Bash et al., 2013; Zhu et al., 2015). However, we are still missing process-level knowledge on some of those interactions.

5.2 Towards interdisciplinary approaches

This review has highlighted the need to connect different scientific disciplines (e.g. physics, ecology, biology, agronomy, chemistry) in order to correctly represent the impacts of LULCCs and LMCs on climate at various spatial scales. In the following, we illustrate the need for such connections using two examples of current challenges in Europe.

5.2.1 Urban – agricultural – natural triptych in a N pollution context

While agriculture has been criticized for several decades for its impacts on water quality (nitrate and pesticides) and for its contribution to climate change (emissions of nitrous oxide and methane), the question of its contribution to air pollution in urban and peri-urban areas has emerged only recently in the public debate, with a particular resurgence in recent spring episodes of aerosol pollution. Ammonia, which is largely emitted by animal excreta and by the application of mineral and organic fertilizers, contributes to the formation of secondary aerosols. Hence, the reduction of its emissions is an important stake for the improvement of air quality. In recent years, control of ammonia emissions has become a major concern at regional, national, and international levels and, since the end of the 1990s, a set of regulations has been put in place. To further reduce ammonia emissions, improve air quality, and optimize costs and benefits requires a better knowledge and quantification of ammonia sources and also an analysis of long-term strategies. France regularly undergoes peaks of aerosol pollution (PM10–PM2.5), especially at the end of winter–early spring, when favourable weather conditions coincide with the beginning of fertilizer spreading. In March 2014, high PM2.5 concentrations were observed in the Paris region, leading to the introduction of alternating traffic, and therefore made citizens particularly aware of the issues of air quality. Predicting air quality at the regional level is crucial to understand these episodes and to recommend appropriate levers of action in the short term to limit the magnitude of these episodes. Air pollution affects not only human health, but also the overall productivity of ecosystems and crop yields, through increased dry deposition of N compounds and O3, which in turn could affect BVOC emissions. In addition, by modifying plant functioning in terms of evapotranspiration and soil moisture status, ozone deposition may affect the hydrological cycle, which in turn will affect surface but also wet deposition of pollutants and nutrients.

We have here a typical example where scientists involved in agronomy, physics, biology, and chemistry should interact to improve predictions of ammonia emissions, transport and reactions related to weather conditions, soil biological processes, and plant phenology, to estimate feedbacks of air pollution on the functioning of involved ecosystems. However, to solve the problem, cooperation between farmers, urban planners, and decision makers is required to define optimal fertilization dates and a territorial planning of urban and peri-urban areas that accounts for the distribution of agricultural activities around the city.

5.2.2 Urban greening – UHI – and impact on VOC–NOxO3 loop

Many studies have explored techniques to counterbalance the deleterious effects of urbanization on the local environment. Among the numerous solutions already proposed, urban greening is one of the most interesting since it could allow (i) an attenuation of the UHI (e.g. Shashua-Bar and Hoffman, 2000; Alexandri and Jones, 2008; Feyisa et al., 2014), (ii) a direct mitigation of air pollution via the absorption of pollutants by plants (Hill, 1971), and (iii) an indirect improvement of air quality through UHI mitigation since temperature partly drives and controls pollutant emission, dispersion, and formation (Sini et al., 1996; Kim and Baik, 1999; Stathopoulou et al., 2008).

On the one hand, green surfaces such as parks, gardens, or green roofs and walls contribute to mitigating the UHI and currently receive strong attention from both scientists and urban planners (e.g. Shashua-Bar and Hoffman, 2000; Akbari et al., 2001; Kumar and Kaushik, 2005; Alexandri and Jones, 2008; Feyisa et al., 2014) with some interdisciplinary and inter-community experiences already established (e.g. the Urban Climate Change Research Network,, last access date: 22 May 2019; the MAPUCE project in Toulouse,, last access date: 7 June 2019, local projects in Stuttgart, New York). On the other hand, a growing number of studies focus on urban air quality assessment to quantify impacts of urban vegetation (e.g. Yang et al., 2005; Novak et al., 2006; Escobedo et al., 2011; Selmi et al., 2016). Changes in planted species and their surfaces can indeed significantly impact the amount and fate of reactive compounds emitted, such as biogenic VOCs or nitrogen compounds, and therefore affect the air chemical composition in terms of gases and aerosols (Ghirardo et al., 2016; Janhäll, 2015; Taha et al., 2016). Nevertheless, feedbacks on air quality by UHI mitigation are not accounted for but could lead to air quality degradation, by affecting pollutant and especially ozone precursor dispersion (Lai and Cheng, 2009). To quantify to which extent urban greening can help to mitigate urban local climate and atmospheric pollution, and its subsequent effects at the regional scale, it is therefore necessary to adopt interdisciplinary approaches (Baró et al., 2014), involving atmospheric physics and chemistry, but also urban planners. Indeed, although the role of urban form, urban fabric, and building arrangement and orientation in UHI mitigation was explored in previous studies (Stone and Norman, 2006; Emmanuel and Fernando, 2007; Shahmohamadi et al., 2010; Middel et al., 2014), this was not the case for atmospheric composition.

5.3 Bridge the gap between communities: the need for developments in the interplay between climate scientists and spatial planners

The knowledge, the instrumentation, and the expertise developed over the last decades regarding land surface–atmosphere interactions and their impacts on local-to-regional climate and air quality could deliver operational and useful outcomes for policymakers and land planners, and thus benefits for populations, activities, and ecosystems. One action that can help bridge this gap is to introduce (or re-introduce) climate expertise into the spatial planning process. The climate issue has clearly become one of the main priorities of planning authorities throughout the world (e.g. Bulkeley, 2006; Wilson and Piper, 2010; Davoudi et al., 2009) in response to the widespread call for fighting global change in many fields and scales of policy. However, relatively few planning authorities directly call upon climate experts. This absence of climate expertise leads planners to ignore many levers of action at local and/or regional scales, some of them being described throughout this article.

Today, more and more urban planning authorities develop in-house climate expertise, with sometimes interesting results. For example, efforts are being made in an increasing number of cities in reduce the urban heat island effect (Ren et al., 2011; Cordeau, 2014). These additional climate skills are nevertheless largely dedicated to urban areas and consequently face difficulties in considering the influence of surface–atmosphere interactions at broader spatial scales. They generally also hardly consider the interplay between climate and air quality issues. There are, however, a few cases that can be sources of inspiration. For instance, for the Stuttgart metropolitan area, which is 3654 km2, the city of Stuttgart's Department of Urban Climatology produced a climatic atlas, based on a climatope approach to assess the influence of spatial units with similar microclimatic characteristics on atmospheric conditions (Baumüller, 2008). This initiative resulted in urban and spatial planning guidance, with the objective to improve the flow of fresh air from the agricultural and natural areas and thus to refresh, clean up, and prevent temperature inversion above built surfaces. The development of local-to-regional actions taking advantage of multiple surface-to-atmosphere interactions can hardly be conceived without using regional meteorological or climate models, since the same land use or land management direction can have very different and even inverse consequences, depending on the context (Marshall et al., 2004a; Schneider and Eugster, 2007; Lobell et al., 2007; DeAngelis et al., 2010). An example of successful collaborations between communities is the digital modelling platform built within the framework of the ACCLIMAT project (, last access: 22 May 2019). This platform allows the numerical modelling of different processes of the city system and their interactions. The developed physical- and urban-based models are forced by socio-economic scenarios of urban development and local climatic scenarios. It is then possible to produce different city projections, from the present day to the end of the century, under different future climate conditions, and to estimate the impacts of these cities on urban climate or on building energy consumption.

Another difficulty to develop a collaborative action lies, among others, in the spatial gap between the respective scales of reference of climate scientists and spatial planners. Climate models have not yet sufficiently been tested at the intermediate spatial scales that are generally considered by planners in their practice. Regional climate models often work at resolutions lower than 15 km × 15 km, while urban climate models work on meshes of about 1 km × 1 km. There is therefore a need to develop models functioning at intermediate scales and integrating a description of land surfaces closer to the definitions and representations used by spatial and urban planners.

Lastly, we need to give more attention today to the modifications created by land use management (e.g. agricultural and forestry practices) on top of land use at a regional and global scale. For climate scientists, this means identifying levers of action, among those proposed by practitioners, in terms of land use management, that can influence climate and air quality. For planners, this is another challenge emerging, questioning the contours of their field of activity, the discipline focusing historically on land use and surface occupancy.

6 Conclusion
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Land–atmosphere interactions involve many physical, biological, and chemical processes that can all influence each other, and that are driven by the characteristics of the environment in which they take place (meteorological conditions, surface properties, etc.). To properly investigate the role and impact of land–atmosphere interactions, especially in the context of LULCCs, on local to regional climate and air quality, the most appropriate and comprehensive tools are required. It is difficult today to design experimental protocols at the regional scale that allow us to identify interactions and impacts of specific processes. When modelling such interactions, one has to recognize that the description of land use and land management (areas concerned, type of crops, quantity of fertilizers used and actual seasonality of application, etc.), including surface properties and emission sources, are overly simplified in today's models. Not taking into account the land surface characteristics certainly biases our projections. Moreover, land–atmosphere interactions are often specific to the target landscape, especially at a local/regional scale; therefore, in this perspective, one can hardly propose general solutions or recommendations. Hence, there is a crucial need for a consistent description of surface characteristics in numerical tools, to both improve our knowledge and provide more appropriate information to urban and land planners and stakeholders at the territory and local scale. Urban and peri-urban areas are of particular attention in this context since land transformation can have big environmental impacts and affect the health and life of millions of people, given the human density in these areas. For example, there is space for considering the links between atmospheric chemistry and land–atmosphere interactions, as a decision parameter for land management, helping to maintain air quality and supporting ecosystem functioning. This leads us to touch on the notion of ecosystem services, which is an integrated approach that allows us to effectively analyse and examine the ecosystem conditions in terms of whether or not the desired services are being delivered. Ecosystem services are highly interlinked, and any kind of human influence on the functioning of one service will likely have a large number of knock-down effects on other services. The types of ecosystem services dealing with the climate and the atmosphere come under the category of regulating services, which were identified and categorized in several studies (Cooter et al., 2013; Thornes et al., 2010). Nevertheless, the feedbacks of the atmosphere to the ecosystem functioning potentially affect the ability of those ecosystems to provide services to the human population.

Data availability
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Data availability. 

No data sets were used in this article.

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The supplement related to this article is available online at:

Author contributions
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Author contributions. 

RSM and JL equally contributed in the conception, outline design, writing, and reviewing of the paper. SuS contributed to writing parts of the paper relative to physical and chemical processes and to reviewing the paper. NdND has solicited this review in the context of the LabEx BASC, and participated in the conception of the paper and contributed to writing the discussion. MS and PS contributed to writing parts of the paper relative to physical processes. SoS contributed to writing parts of the paper relative to chemical processes. EP contributed to writing parts of the paper relative to biological processes. MP contributed to writing parts of the paper relative to urban planning, and LULCC. All authors participated in the outline design and reviewed the paper.

Competing interests
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Competing interests. 

The authors declare that they have no conflict of interest.

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This work was supported by a grant overseen by the French National Research Agency (ANR) as part of the “Investments d'Avenir” programme (LabEx BASC; ANR-11-LABX-0034). The work of Marc Stéfanon was supported by the French National Research Agency (ANR) as part of the project Forewer (ANR-14-CE05-0028).

Review statement
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Review statement. 

This paper was edited by Akihiko Ito and reviewed by two anonymous referees.

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Publications Copernicus
Short summary
Human activities strongly interfere in the land–atmosphere interactions through changes in land use and land cover changes and land management. The objectives of this review are to synthesize the existing experimental and modelling works that investigate physical, chemical, and biogeochemical interactions between land surface and the atmosphere. Greater consideration of atmospheric chemistry, through land–atmosphere interactions, as a decision parameter for land management is essential.
Human activities strongly interfere in the land–atmosphere interactions through changes in land...