Articles | Volume 13, issue 4
https://doi.org/10.5194/bg-13-943-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-13-943-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
19 Feb 2016
Research article |
| 19 Feb 2016
Uncertainty and sensitivity in optode-based shelf-sea net community production estimates
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, UK
Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK
Naomi Greenwood
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, UK
Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK
Jan Kaiser
Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK
Martin Johnson
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, UK
Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK
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Fabian Große, Naomi Greenwood, Markus Kreus, Hermann-Josef Lenhart, Detlev Machoczek, Johannes Pätsch, Lesley Salt, and Helmuth Thomas
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S. Walter, A. Kock, T. Steinhoff, B. Fiedler, P. Fietzek, J. Kaiser, M. Krol, M. E. Popa, Q. Chen, T. Tanhua, and T. Röckmann
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J. Gloël, C. Robinson, G. H. Tilstone, G. Tarran, and J. Kaiser
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We assess benzalkonium chloride (BAC) as alternative to mercuric chloride (HgCl2) for preservation of seawater samples. BAC concentrations of 50mg dm–3 inhibited microbial activity for at least 3 days in samples tested with chlorophyll a concentrations up to 1mg m–3. With fewer risks to health and environment, and lower waste disposal costs, BAC could be a short-term alternative to HgCl2, but cannot replace it for oxygen triple isotope samples, which require storage over weeks to months.
K. Ishijima, M. Takigawa, K. Sudo, S. Toyoda, N. Yoshida, T. Röckmann, J. Kaiser, S. Aoki, S. Morimoto, S. Sugawara, and T. Nakazawa
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S. J. Allin, J. C. Laube, E. Witrant, J. Kaiser, E. McKenna, P. Dennis, R. Mulvaney, E. Capron, P. Martinerie, T. Röckmann, T. Blunier, J. Schwander, P. J. Fraser, R. L. Langenfelds, and W. T. Sturges
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This study provides a better understanding of source and sink processes associated with these destructive compounds.
D. J. Mrozek, C. van der Veen, M. Kliphuis, J. Kaiser, A. A. Wiegel, and T. Röckmann
Atmos. Meas. Tech., 8, 811–822, https://doi.org/10.5194/amt-8-811-2015, https://doi.org/10.5194/amt-8-811-2015, 2015
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Our analytical system is a promising tool for investigating the triple oxygen isotope composition of CO2 from stratospheric air samples of volumes 100ml and smaller. The method is designed for measuring air samples with CO2 mole fractions between 360 and 400ppm, and it is the first fully automated analytical system that uses CeO2 as the isotope exchange medium.
N. Jiao, C. Robinson, F. Azam, H. Thomas, F. Baltar, H. Dang, N. J. Hardman-Mountford, M. Johnson, D. L. Kirchman, B. P. Koch, L. Legendre, C. Li, J. Liu, T. Luo, Y.-W. Luo, A. Mitra, A. Romanou, K. Tang, X. Wang, C. Zhang, and R. Zhang
Biogeosciences, 11, 5285–5306, https://doi.org/10.5194/bg-11-5285-2014, https://doi.org/10.5194/bg-11-5285-2014, 2014
M. Yang, R. Beale, P. Liss, M. Johnson, B. Blomquist, and P. Nightingale
Atmos. Chem. Phys., 14, 7499–7517, https://doi.org/10.5194/acp-14-7499-2014, https://doi.org/10.5194/acp-14-7499-2014, 2014
I. Grefe and J. Kaiser
Ocean Sci., 10, 501–512, https://doi.org/10.5194/os-10-501-2014, https://doi.org/10.5194/os-10-501-2014, 2014
V. V. Petrenko, P. Martinerie, P. Novelli, D. M. Etheridge, I. Levin, Z. Wang, T. Blunier, J. Chappellaz, J. Kaiser, P. Lang, L. P. Steele, S. Hammer, J. Mak, R. L. Langenfelds, J. Schwander, J. P. Severinghaus, E. Witrant, G. Petron, M. O. Battle, G. Forster, W. T. Sturges, J.-F. Lamarque, K. Steffen, and J. W. C. White
Atmos. Chem. Phys., 13, 7567–7585, https://doi.org/10.5194/acp-13-7567-2013, https://doi.org/10.5194/acp-13-7567-2013, 2013
K. Castro-Morales, N. Cassar, D. R. Shoosmith, and J. Kaiser
Biogeosciences, 10, 2273–2291, https://doi.org/10.5194/bg-10-2273-2013, https://doi.org/10.5194/bg-10-2273-2013, 2013
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Investigating the effect of nickel concentration on phytoplankton growth to assess potential side-effects of ocean alkalinity enhancement
Unprecedented summer hypoxia in southern Cape Cod Bay: an ecological response to regional climate change?
Interannual variabilities, long-term trends, and regulating factors of low-oxygen conditions in the coastal waters off Hong Kong
Causes of the extensive hypoxia in the Gulf of Riga in 2018
Trawling effects on biogeochemical processes are mediated by fauna in high-energy biogenic-reef-inhabited coastal sediments
Drought recorded by Ba∕Ca in coastal benthic foraminifera
Charlotte A. J. Williams, Tom Hull, Jan Kaiser, Claire Mahaffey, Naomi Greenwood, Matthew Toberman, and Matthew R. Palmer
Biogeosciences, 21, 1961–1971, https://doi.org/10.5194/bg-21-1961-2024, https://doi.org/10.5194/bg-21-1961-2024, 2024
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Oxygen (O2) is a key indicator of ocean health. The risk of O2 loss in the productive coastal/continental slope regions is increasing. Autonomous underwater vehicles equipped with O2 optodes provide lots of data but have problems resolving strong vertical O2 changes. Here we show how to overcome this and calculate how much O2 is supplied to the low-O2 bottom waters via mixing. Bursts in mixing supply nearly all of the O2 to bottom waters in autumn, stopping them reaching ecologically low levels.
Sabine Schmidt and Ibrahima Iris Diallo
Biogeosciences, 21, 1785–1800, https://doi.org/10.5194/bg-21-1785-2024, https://doi.org/10.5194/bg-21-1785-2024, 2024
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Along the French coast facing the Bay of Biscay, the large Gironde and Loire estuaries suffer from hypoxia. This prompted a study of the small Charente estuary located between them. This work reveals a minimum oxygen zone in the Charente estuary, which extends for about 25 km. Temperature is the main factor controlling the hypoxia. This calls for the monitoring of small turbid macrotidal estuaries that are vulnerable to hypoxia, a risk expected to increase with global warming.
Simone R. Alin, Jan A. Newton, Richard A. Feely, Samantha Siedlecki, and Dana Greeley
Biogeosciences, 21, 1639–1673, https://doi.org/10.5194/bg-21-1639-2024, https://doi.org/10.5194/bg-21-1639-2024, 2024
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We provide a new multi-stressor data product that allows us to characterize the seasonality of temperature, O2, and CO2 in the southern Salish Sea and delivers insights into the impacts of major marine heatwave and precipitation anomalies on regional ocean acidification and hypoxia. We also describe the present-day frequencies of temperature, O2, and ocean acidification conditions that cross thresholds of sensitive regional species that are economically or ecologically important.
Pamela Linford, Iván Pérez-Santos, Paulina Montero, Patricio A. Díaz, Claudia Aracena, Elías Pinilla, Facundo Barrera, Manuel Castillo, Aida Alvera-Azcárate, Mónica Alvarado, Gabriel Soto, Cécile Pujol, Camila Schwerter, Sara Arenas-Uribe, Pilar Navarro, Guido Mancilla-Gutiérrez, Robinson Altamirano, Javiera San Martín, and Camila Soto-Riquelme
Biogeosciences, 21, 1433–1459, https://doi.org/10.5194/bg-21-1433-2024, https://doi.org/10.5194/bg-21-1433-2024, 2024
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The Patagonian fjords comprise a world region where low-oxygen water and hypoxia conditions are observed. An in situ dataset was used to quantify the mechanism involved in the presence of these conditions in northern Patagonian fjords. Water mass analysis confirmed the contribution of Equatorial Subsurface Water in the advection of the low-oxygen water, and hypoxic conditions occurred when the community respiration rate exceeded the gross primary production.
Ting Wang, Buyun Du, Inke Forbrich, Jun Zhou, Joshua Polen, Elsie M. Sunderland, Prentiss H. Balcom, Celia Chen, and Daniel Obrist
Biogeosciences, 21, 1461–1476, https://doi.org/10.5194/bg-21-1461-2024, https://doi.org/10.5194/bg-21-1461-2024, 2024
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The strong seasonal increases of Hg in aboveground biomass during the growing season and the lack of changes observed after senescence in this salt marsh ecosystem suggest physiologically controlled Hg uptake pathways. The Hg sources found in marsh aboveground tissues originate from a mix of sources, unlike terrestrial ecosystems, where atmospheric GEM is the main source. Belowground plant tissues mostly take up Hg from soils. Overall, the salt marsh currently serves as a small net Hg sink.
Eleanor Simpson, Debby Ianson, Karen E. Kohfeld, Ana C. Franco, Paul A. Covert, Marty Davelaar, and Yves Perreault
Biogeosciences, 21, 1323–1353, https://doi.org/10.5194/bg-21-1323-2024, https://doi.org/10.5194/bg-21-1323-2024, 2024
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Shellfish aquaculture operates in nearshore areas where data on ocean acidification parameters are limited. We show daily and seasonal variability in pH and saturation states of calcium carbonate at nearshore aquaculture sites in British Columbia, Canada, and determine the contributing drivers of this variability. We find that nearshore locations have greater variability than open waters and that the uptake of carbon by phytoplankton is the major driver of pH and saturation state variability.
S. Alejandra Castillo Cieza, Rachel H. R. Stanley, Pierre Marrec, Diana N. Fontaine, E. Taylor Crockford, Dennis J. McGillicuddy Jr., Arshia Mehta, Susanne Menden-Deuer, Emily E. Peacock, Tatiana A. Rynearson, Zoe O. Sandwith, Weifeng Zhang, and Heidi M. Sosik
Biogeosciences, 21, 1235–1257, https://doi.org/10.5194/bg-21-1235-2024, https://doi.org/10.5194/bg-21-1235-2024, 2024
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The coastal ocean in the northeastern USA provides many services, including fisheries and habitats for threatened species. In summer 2019, a bloom occurred of a large unusual phytoplankton, the diatom Hemiaulus, with nitrogen-fixing symbionts. This led to vast changes in productivity and grazing rates in the ecosystem. This work shows that the emergence of one species can have profound effects on ecosystem function. Such changes may become more prevalent as the ocean warms due to climate change.
Claudine Hauri, Brita Irving, Sam Dupont, Rémi Pagés, Donna D. W. Hauser, and Seth L. Danielson
Biogeosciences, 21, 1135–1159, https://doi.org/10.5194/bg-21-1135-2024, https://doi.org/10.5194/bg-21-1135-2024, 2024
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Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. We present pH and pCO2 time series (2016–2020) from the Chukchi Ecosystem Observatory and analyze the drivers of the current conditions to get a better understanding of how climate change and ocean acidification could affect the ecological niches of organisms.
William Hiles, Lucy C. Miller, Craig Smeaton, and William E. N. Austin
Biogeosciences, 21, 929–948, https://doi.org/10.5194/bg-21-929-2024, https://doi.org/10.5194/bg-21-929-2024, 2024
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Saltmarsh soils may help to limit the rate of climate change by storing carbon. To understand their impacts, they must be accurately mapped. We use drone data to estimate the size of three saltmarshes in NE Scotland. We find that drone imagery, combined with tidal data, can reliably inform our understanding of saltmarsh size. When compared with previous work using vegetation communities, we find that our most reliable new estimates of stored carbon are 15–20 % smaller than previously estimated.
De'Marcus Robinson, Anh L. D. Pham, David J. Yousavich, Felix Janssen, Frank Wenzhöfer, Eleanor C. Arrington, Kelsey M. Gosselin, Marco Sandoval-Belmar, Matthew Mar, David L. Valentine, Daniele Bianchi, and Tina Treude
Biogeosciences, 21, 773–788, https://doi.org/10.5194/bg-21-773-2024, https://doi.org/10.5194/bg-21-773-2024, 2024
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The present study suggests that high release of ferrous iron from the seafloor of the oxygen-deficient Santa Barabara Basin (California) supports surface primary productivity, creating positive feedback on seafloor iron release by enhancing low-oxygen conditions in the basin.
David J. Yousavich, De'Marcus Robinson, Xuefeng Peng, Sebastian J. E. Krause, Frank Wenzhöfer, Felix Janssen, Na Liu, Jonathan Tarn, Franklin Kinnaman, David L. Valentine, and Tina Treude
Biogeosciences, 21, 789–809, https://doi.org/10.5194/bg-21-789-2024, https://doi.org/10.5194/bg-21-789-2024, 2024
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Declining oxygen (O2) concentrations in coastal oceans can threaten people’s ways of life and food supplies. Here, we investigate how mats of bacteria that proliferate on the seafloor of the Santa Barbara Basin sustain and potentially worsen these O2 depletion events through their unique chemoautotrophic metabolism. Our study shows how changes in seafloor microbiology and geochemistry brought on by declining O2 concentrations can help these mats grow as well as how that growth affects the basin.
Lucas Porz, Wenyan Zhang, Nils Gerrit Christiansen, Jan Kossack, Ute Daewel, and Corinna Schrum
EGUsphere, https://doi.org/10.5194/egusphere-2024-399, https://doi.org/10.5194/egusphere-2024-399, 2024
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Seafloor sediments store a large amount of carbon, helping to naturally regulate Earth's climate. If disturbed, some sediment particles can turn into CO2, but this effect is not well understood. Using computer simulations, we found that bottom-contacting fishing gears release about 1 million tons of CO2 per year in the North Sea, one of the most heavily fished regions globally. We show how protecting certain areas could reduce these emissions while also benefitting seafloor-living animals.
Krysten Rutherford, Katja Fennel, Lina Garcia Suarez, and Jasmin G. John
Biogeosciences, 21, 301–314, https://doi.org/10.5194/bg-21-301-2024, https://doi.org/10.5194/bg-21-301-2024, 2024
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We downscaled two mid-century (~2075) ocean model projections to a high-resolution regional ocean model of the northwest North Atlantic (NA) shelf. In one projection, the NA shelf break current practically disappears; in the other it remains almost unchanged. This leads to a wide range of possible future shelf properties. More accurate projections of coastal circulation features would narrow the range of possible outcomes of biogeochemical projections for shelf regions.
Lennart Thomas Bach
Biogeosciences, 21, 261–277, https://doi.org/10.5194/bg-21-261-2024, https://doi.org/10.5194/bg-21-261-2024, 2024
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Ocean alkalinity enhancement (OAE) is a widely considered marine carbon dioxide removal method. OAE aims to accelerate chemical rock weathering, which is a natural process that slowly sequesters atmospheric carbon dioxide. This study shows that the addition of anthropogenic alkalinity via OAE can reduce the natural release of alkalinity and, therefore, reduce the efficiency of OAE for climate mitigation. However, the additionality problem could be mitigated via a variety of activities.
Tsuneo Ono, Daisuke Muraoka, Masahiro Hayashi, Makiko Yorifuji, Akihiro Dazai, Shigeyuki Omoto, Takehiro Tanaka, Tomohiro Okamura, Goh Onitsuka, Kenji Sudo, Masahiko Fujii, Ryuji Hamanoue, and Masahide Wakita
Biogeosciences, 21, 177–199, https://doi.org/10.5194/bg-21-177-2024, https://doi.org/10.5194/bg-21-177-2024, 2024
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We carried out parallel year-round observations of pH and related parameters in five stations around the Japan coast. It was found that short-term acidified situations with Omega_ar less than 1.5 occurred at four of five stations. Most of such short-term acidified events were related to the short-term low salinity event, and the extent of short-term pH drawdown at high freshwater input was positively correlated with the nutrient concentration of the main rivers that flow into the coastal area.
K. Mareike Paul, Martijn Hermans, Sami A. Jokinen, Inda Brinkmann, Helena L. Filipsson, and Tom Jilbert
Biogeosciences, 20, 5003–5028, https://doi.org/10.5194/bg-20-5003-2023, https://doi.org/10.5194/bg-20-5003-2023, 2023
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Seawater naturally contains trace metals such as Mo and U, which accumulate under low oxygen conditions on the seafloor. Previous studies have used sediment Mo and U contents as an archive of changing oxygen concentrations in coastal waters. Here we show that in fjords the use of Mo and U for this purpose may be impaired by additional processes. Our findings have implications for the reliable use of Mo and U to reconstruct oxygen changes in fjords.
Hannah Sharpe, Michel Gosselin, Catherine Lalande, Alexandre Normandeau, Jean-Carlos Montero-Serrano, Khouloud Baccara, Daniel Bourgault, Owen Sherwood, and Audrey Limoges
Biogeosciences, 20, 4981–5001, https://doi.org/10.5194/bg-20-4981-2023, https://doi.org/10.5194/bg-20-4981-2023, 2023
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We studied the impact of submarine canyon processes within the Pointe-des-Monts system on biogenic matter export and phytoplankton assemblages. Using data from three oceanographic moorings, we show that the canyon experienced two low-amplitude sediment remobilization events in 2020–2021 that led to enhanced particle fluxes in the deep-water column layer > 2.6 km offshore. Sinking phytoplankton fluxes were lower near the canyon compared to background values from the lower St. Lawrence Estuary.
David González-Santana, María Segovia, Melchor González-Dávila, Librada Ramírez, Aridane G. González, Leonardo J. Pozzo, Veronica Arnone, Victor Vázquez, Ulf Riebesell, and J. Magdalena Santana-Casiano
EGUsphere, https://doi.org/10.5194/egusphere-2023-2868, https://doi.org/10.5194/egusphere-2023-2868, 2023
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In a recent experiment off the coast of Gran Canaria (Spain), scientists explored a method called Ocean Alkalinization Enhancement (OAE), where carbonate minerals were added to seawater. This process changed the levels of certain ions in the water, affecting its pH and buffering capacity. The researchers were particularly interested in how this could impact the levels of essential trace metals in the water.
Dewi Langlet, Florian Mermillod-Blondin, Noémie Deldicq, Arthur Bauville, Gwendoline Duong, Lara Konecny, Mylène Hugoni, Lionel Denis, and Vincent M. P. Bouchet
Biogeosciences, 20, 4875–4891, https://doi.org/10.5194/bg-20-4875-2023, https://doi.org/10.5194/bg-20-4875-2023, 2023
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Benthic foraminifera are single-cell marine organisms which can move in the sediment column. They were previously reported to horizontally and vertically transport sediment particles, yet the impact of their motion on the dissolved fluxes remains unknown. Using microprofiling, we show here that foraminiferal burrow formation increases the oxygen penetration depth in the sediment, leading to a change in the structure of the prokaryotic community.
Masahiko Fujii, Ryuji Hamanoue, Lawrence Patrick Cases Bernardo, Tsuneo Ono, Akihiro Dazai, Shigeyuki Oomoto, Masahide Wakita, and Takehiro Tanaka
Biogeosciences, 20, 4527–4549, https://doi.org/10.5194/bg-20-4527-2023, https://doi.org/10.5194/bg-20-4527-2023, 2023
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This is the first study of the current and future impacts of climate change on Pacific oyster farming in Japan. Future coastal warming and acidification may affect oyster larvae as a result of longer exposure to lower-pH waters. A prolonged spawning period may harm oyster processing by shortening the shipping period and reducing oyster quality. To minimize impacts on Pacific oyster farming, in addition to mitigation measures, local adaptation measures may be required.
Sandy E. Tenorio and Laura Farías
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-185, https://doi.org/10.5194/bg-2023-185, 2023
Revised manuscript accepted for BG
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Time series studies show that CH4 is highly dynamic on the coastal ocean surface and that planktonic communities are linked to CH4 accumulation as is found in coastal upwelling off Central Chile. We’ve identified the crucial role of picoplankton (>3μm) in CH4 recycling, especially with the addition of methylated substrates (TMA and MPn) during upwelling and non-upwelling periods. These insights improve understanding of surface ocean CH4 recycling, aiding accurate CH4 emissions estimates.
Jiaying A. Guo, Robert F. Strzepek, Kerrie M. Swadling, Ashley T. Townsend, and Lennart T. Bach
EGUsphere, https://doi.org/10.5194/egusphere-2023-2120, https://doi.org/10.5194/egusphere-2023-2120, 2023
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Ocean alkalinity enhancement (OAE) aims to increase atmospheric CO2 sequestration in the oceans by spreading ground alkaline materials into the ocean. To assess the environmental impacts of OAE, we used 53 L microcosms to test how coastal plankton communities respond to OAE with olivine or steel slag as alkalinity sources. Overall, steel slag is much more efficient for CO2 removal than olivine and appears to be induce less changes in the phytoplankton and zooplankton communities.
Taketoshi Kodama, Atsushi Nishimoto, Ken-ichi Nakamura, Misato Nakae, Naoki Iguchi, Yosuke Igeta, and Yoichi Kogure
Biogeosciences, 20, 3667–3682, https://doi.org/10.5194/bg-20-3667-2023, https://doi.org/10.5194/bg-20-3667-2023, 2023
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Carbon and nitrogen are essential elements for organisms; their stable isotope ratios (13C : 12C, 15N : 14N) are useful tools for understanding turnover and movement in the ocean. In the Sea of Japan, the environment is rapidly being altered by human activities. The 13C : 12C of small organic particles is increased by active carbon fixation, and phytoplankton growth increases the values. The 15N : 14N variations suggest that nitrates from many sources contribute to organic production.
Aubin Thibault de Chanvalon, George W. Luther, Emily R. Estes, Jennifer Necker, Bradley M. Tebo, Jianzhong Su, and Wei-Jun Cai
Biogeosciences, 20, 3053–3071, https://doi.org/10.5194/bg-20-3053-2023, https://doi.org/10.5194/bg-20-3053-2023, 2023
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The intensity of the oceanic trap of CO2 released by anthropogenic activities depends on the alkalinity brought by continental weathering. Between ocean and continent, coastal water and estuaries can limit or favour the alkalinity transfer. This study investigate new interactions between dissolved metals and alkalinity in the oxygen-depleted zone of estuaries.
Joonas J. Virtasalo, Peter Österholm, and Eero Asmala
Biogeosciences, 20, 2883–2901, https://doi.org/10.5194/bg-20-2883-2023, https://doi.org/10.5194/bg-20-2883-2023, 2023
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We mixed acidic metal-rich river water from acid sulfate soils and seawater in the laboratory to study the flocculation of dissolved metals and organic matter in estuaries. Al and Fe flocculated already at a salinity of 0–2 to large organic flocs (>80 µm size). Precipitation of Al and Fe hydroxide flocculi (median size 11 µm) began when pH exceeded ca. 5.5. Mn transferred weakly to Mn hydroxides and Co to the flocs. Up to 50 % of Cu was associated with the flocs, irrespective of seawater mixing.
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell
Biogeosciences, 20, 2595–2612, https://doi.org/10.5194/bg-20-2595-2023, https://doi.org/10.5194/bg-20-2595-2023, 2023
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The sinking velocity of marine particles affects how much atmospheric CO2 is stored inside our oceans. We measured particle sinking velocities in the Peruvian upwelling system and assessed their physical and biochemical drivers. We found that sinking velocity was mainly influenced by particle size and porosity, while ballasting minerals played only a minor role. Our findings help us to better understand the particle sinking dynamics in this highly productive marine system.
Giovanni Galli, Sarah Wakelin, James Harle, Jason Holt, and Yuri Artioli
EGUsphere, https://doi.org/10.5194/egusphere-2023-1049, https://doi.org/10.5194/egusphere-2023-1049, 2023
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In this work we looked at the projected change in bottom water oxygen content in an ensemble of ocean climate change models of the North Western European Shelf. What emerged is that, 1. oxygen decreases in all models, 2. in the models with the most warming, a change in circulation patterns is tied to the emergence of low oxygen hotspots in the Eastern North Sea, and, 3. in relatively shallow coastal areas increasing in primary production partially mitigates oxygen decline.
Kyle E. Hinson, Marjorie A. M. Friedrichs, Raymond G. Najjar, Maria Herrmann, Zihao Bian, Gopal Bhatt, Pierre St-Laurent, Hanqin Tian, and Gary Shenk
Biogeosciences, 20, 1937–1961, https://doi.org/10.5194/bg-20-1937-2023, https://doi.org/10.5194/bg-20-1937-2023, 2023
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Climate impacts are essential for environmental managers to consider when implementing nutrient reduction plans designed to reduce hypoxia. This work highlights relative sources of uncertainty in modeling regional climate impacts on the Chesapeake Bay watershed and consequent declines in bay oxygen levels. The results demonstrate that planned water quality improvement goals are capable of reducing hypoxia levels by half, offsetting climate-driven impacts on terrestrial runoff.
Linquan Mu, Jaime B. Palter, and Hongjie Wang
Biogeosciences, 20, 1963–1977, https://doi.org/10.5194/bg-20-1963-2023, https://doi.org/10.5194/bg-20-1963-2023, 2023
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Enhancing ocean alkalinity accelerates carbon dioxide removal from the atmosphere. We hypothetically added alkalinity to the Amazon River and examined the increment of the carbon uptake by the Amazon plume. We also investigated the minimum alkalinity addition in which this perturbation at the river mouth could be detected above the natural variability.
Karl M. Attard, Anna Lyssenko, and Iván F. Rodil
Biogeosciences, 20, 1713–1724, https://doi.org/10.5194/bg-20-1713-2023, https://doi.org/10.5194/bg-20-1713-2023, 2023
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Aquatic plants produce a large amount of organic matter through photosynthesis that, following erosion, is deposited on the seafloor. In this study, we show that plant detritus can trigger low-oxygen conditions (hypoxia) in shallow coastal waters, making conditions challenging for most marine animals. We propose that the occurrence of hypoxia may be underestimated because measurements typically do not consider the region closest to the seafloor, where detritus accumulates.
M. James McLaughlin, Cindy Bessey, Gary A. Kendrick, John Keesing, and Ylva S. Olsen
Biogeosciences, 20, 1011–1026, https://doi.org/10.5194/bg-20-1011-2023, https://doi.org/10.5194/bg-20-1011-2023, 2023
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Coral reefs face increasing pressures from environmental change at present. The coral reef framework is produced by corals and calcifying algae. The Kimberley region of Western Australia has escaped land-based anthropogenic impacts. Specimens of the dominant coral and algae were collected from Browse Island's reef platform and incubated in mesocosms to measure calcification and production patterns of oxygen. This study provides important data on reef building and climate-driven effects.
Patricia Ayón Dejo, Elda Luz Pinedo Arteaga, Anna Schukat, Jan Taucher, Rainer Kiko, Helena Hauss, Sabrina Dorschner, Wilhelm Hagen, Mariona Segura-Noguera, and Silke Lischka
Biogeosciences, 20, 945–969, https://doi.org/10.5194/bg-20-945-2023, https://doi.org/10.5194/bg-20-945-2023, 2023
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Ocean upwelling regions are highly productive. With ocean warming, severe changes in upwelling frequency and/or intensity and expansion of accompanying oxygen minimum zones are projected. In a field experiment off Peru, we investigated how different upwelling intensities affect the pelagic food web and found failed reproduction of dominant zooplankton. The changes projected could severely impact the reproductive success of zooplankton communities and the pelagic food web in upwelling regions.
Mathilde Jutras, Alfonso Mucci, Gwenaëlle Chaillou, William A. Nesbitt, and Douglas W. R. Wallace
Biogeosciences, 20, 839–849, https://doi.org/10.5194/bg-20-839-2023, https://doi.org/10.5194/bg-20-839-2023, 2023
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The deep waters of the lower St Lawrence Estuary and gulf have, in the last decades, experienced a strong decline in their oxygen concentration. Below 65 µmol L-1, the waters are said to be hypoxic, with dire consequences for marine life. We show that the extent of the hypoxic zone shows a seven-fold increase in the last 20 years, reaching 9400 km2 in 2021. After a stable period at ~ 65 µmol L⁻¹ from 1984 to 2019, the oxygen level also suddenly decreased to ~ 35 µmol L-1 in 2020.
Sachi Umezawa, Manami Tozawa, Yuichi Nosaka, Daiki Nomura, Hiroji Onishi, Hiroto Abe, Tetsuya Takatsu, and Atsushi Ooki
Biogeosciences, 20, 421–438, https://doi.org/10.5194/bg-20-421-2023, https://doi.org/10.5194/bg-20-421-2023, 2023
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We conducted repetitive observations in Funka Bay, Japan, during the spring bloom 2019. We found nutrient concentration decreases in the dark subsurface layer during the bloom. Incubation experiments confirmed that diatoms could consume nutrients at a substantial rate, even in darkness. We concluded that the nutrient reduction was mainly caused by nutrient consumption by diatoms in the dark.
Dirk Jong, Lisa Bröder, Tommaso Tesi, Kirsi H. Keskitalo, Nikita Zimov, Anna Davydova, Philip Pika, Negar Haghipour, Timothy I. Eglinton, and Jorien E. Vonk
Biogeosciences, 20, 271–294, https://doi.org/10.5194/bg-20-271-2023, https://doi.org/10.5194/bg-20-271-2023, 2023
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With this study, we want to highlight the importance of studying both land and ocean together, and water and sediment together, as these systems function as a continuum, and determine how organic carbon derived from permafrost is broken down and its effect on global warming. Although on the one hand it appears that organic carbon is removed from sediments along the pathway of transport from river to ocean, it also appears to remain relatively ‘fresh’, despite this removal and its very old age.
Georgia Filippi, Manos Dassenakis, Vasiliki Paraskevopoulou, and Konstantinos Lazogiannis
Biogeosciences, 20, 163–189, https://doi.org/10.5194/bg-20-163-2023, https://doi.org/10.5194/bg-20-163-2023, 2023
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The pollution of the western Saronikos Gulf from heavy metals has been examined through the study of marine sediment cores. It is a deep gulf (maximum depth 440 m) near Athens affected by industrial and volcanic activity. Eight cores were received from various stations and depths and analysed for their heavy metal content and geochemical characteristics. The results were evaluated by using statistical methods, environmental indicators and comparisons with old data.
Jing He and Michael D. Tyka
Biogeosciences, 20, 27–43, https://doi.org/10.5194/bg-20-27-2023, https://doi.org/10.5194/bg-20-27-2023, 2023
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Recently, ocean alkalinity enhancement (OAE) has gained interest as a scalable way to address the urgent need for negative CO2 emissions. In this paper we examine the capacity of different coastlines to tolerate alkalinity enhancement and the time scale of CO2 uptake following the addition of a given quantity of alkalinity. The results suggest that OAE has significant potential and identify specific favorable and unfavorable coastlines for its deployment.
Arnaud Laurent, Haiyan Zhang, and Katja Fennel
Biogeosciences, 19, 5893–5910, https://doi.org/10.5194/bg-19-5893-2022, https://doi.org/10.5194/bg-19-5893-2022, 2022
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The Changjiang is the main terrestrial source of nutrients to the East China Sea (ECS). Nutrient delivery to the ECS has been increasing since the 1960s, resulting in low oxygen (hypoxia) during phytoplankton decomposition in summer. River phosphorus (P) has increased less than nitrogen, and therefore, despite the large nutrient delivery, phytoplankton growth can be limited by the lack of P. Here, we investigate this link between P limitation, phytoplankton production/decomposition, and hypoxia.
Coline Poppeschi, Guillaume Charria, Anne Daniel, Romaric Verney, Peggy Rimmelin-Maury, Michaël Retho, Eric Goberville, Emilie Grossteffan, and Martin Plus
Biogeosciences, 19, 5667–5687, https://doi.org/10.5194/bg-19-5667-2022, https://doi.org/10.5194/bg-19-5667-2022, 2022
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This paper aims to understand interannual changes in the initiation of the phytoplankton growing period (IPGP) in the current context of global climate changes over the last 20 years. An important variability in the timing of the IPGP is observed with a trend towards a later IPGP during this last decade. The role and the impact of extreme events (cold spells, floods, and wind burst) on the IPGP is also detailed.
Lin Yang, Jing Zhang, Anja Engel, and Gui-Peng Yang
Biogeosciences, 19, 5251–5268, https://doi.org/10.5194/bg-19-5251-2022, https://doi.org/10.5194/bg-19-5251-2022, 2022
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Enrichment factors of dissolved organic matter (DOM) in the eastern marginal seas of China exhibited a significant spatio-temporal variation. Photochemical and enrichment processes co-regulated DOM enrichment in the sea-surface microlayer (SML). Autochthonous DOM was more frequently enriched in the SML than terrestrial DOM. DOM in the sub-surface water exhibited higher aromaticity than that in the SML.
Mona Norbisrath, Johannes Pätsch, Kirstin Dähnke, Tina Sanders, Gesa Schulz, Justus E. E. van Beusekom, and Helmuth Thomas
Biogeosciences, 19, 5151–5165, https://doi.org/10.5194/bg-19-5151-2022, https://doi.org/10.5194/bg-19-5151-2022, 2022
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Total alkalinity (TA) regulates the oceanic storage capacity of atmospheric CO2. TA is also metabolically generated in estuaries and influences coastal carbon storage through its inflows. We used water samples and identified the Hamburg port area as the one with highest TA generation. Of the overall riverine TA load, 14 % is generated within the estuary. Using a biogeochemical model, we estimated potential effects on the coastal carbon storage under possible anthropogenic and climate changes.
Le Zhang and Z. George Xue
Biogeosciences, 19, 4589–4618, https://doi.org/10.5194/bg-19-4589-2022, https://doi.org/10.5194/bg-19-4589-2022, 2022
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We adopt a high-resolution carbon model for the Gulf of Mexico (GoM) and calculate the decadal trends of important carbon system variables in the GoM from 2001 to 2019. The GoM surface CO2 values experienced a steady increase over the past 2 decades, and the ocean surface pH is declining. Although carbonate saturation rates remain supersaturated with aragonite, they show a slightly decreasing trend. The northern GoM is a stronger carbon sink than we thought.
Michael M. Whitney
Biogeosciences, 19, 4479–4497, https://doi.org/10.5194/bg-19-4479-2022, https://doi.org/10.5194/bg-19-4479-2022, 2022
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Coastal hypoxia is a major environmental problem of increasing severity. The 21st-century projections analyzed indicate global coastal waters will warm and experience rapid declines in oxygen. The forecasted median coastal trends for increasing sea surface temperature and decreasing oxygen capacity are 48 % and 18 % faster than the rates observed over the last 4 decades. Existing hypoxic areas are expected to worsen, and new hypoxic areas likely will emerge under these warming-related pressures.
Bryce Van Dam, Nele Lehmann, Mary A. Zeller, Andreas Neumann, Daniel Pröfrock, Marko Lipka, Helmuth Thomas, and Michael Ernst Böttcher
Biogeosciences, 19, 3775–3789, https://doi.org/10.5194/bg-19-3775-2022, https://doi.org/10.5194/bg-19-3775-2022, 2022
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We quantified sediment–water exchange at shallow sites in the North and Baltic seas. We found that porewater irrigation rates in the former were approximately twice as high as previously estimated, likely driven by relatively high bioirrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from −35 µmol m−2 h−1 (uptake) to 53 µmol m−2 h−1 (release). We attribute this to low net denitrification, carbonate mineral (re-)precipitation, and sulfide (re-)oxidation.
Jiaying Abby Guo, Robert Strzepek, Anusuya Willis, Aaron Ferderer, and Lennart Thomas Bach
Biogeosciences, 19, 3683–3697, https://doi.org/10.5194/bg-19-3683-2022, https://doi.org/10.5194/bg-19-3683-2022, 2022
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Ocean alkalinity enhancement is a CO2 removal method with significant potential, but it can lead to a perturbation of the ocean with trace metals such as nickel. This study tested the effect of increasing nickel concentrations on phytoplankton growth and photosynthesis. We found that the response to nickel varied across the 11 phytoplankton species tested here, but the majority were rather insensitive. We note, however, that responses may be different under other experimental conditions.
Malcolm E. Scully, W. Rockwell Geyer, David Borkman, Tracy L. Pugh, Amy Costa, and Owen C. Nichols
Biogeosciences, 19, 3523–3536, https://doi.org/10.5194/bg-19-3523-2022, https://doi.org/10.5194/bg-19-3523-2022, 2022
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For two consecutive summers, the bottom waters in southern Cape Cod Bay became severely depleted of dissolved oxygen. Low oxygen levels in bottom waters have never been reported in this area before, and this unprecedented occurrence is likely the result of a new algae species that recently began blooming during the late-summer months. We present data suggesting that blooms of this new species are the result of regional climate change including warmer waters and changes in summer winds.
Zheng Chen, Bin Wang, Chuang Xu, Zhongren Zhang, Shiyu Li, and Jiatang Hu
Biogeosciences, 19, 3469–3490, https://doi.org/10.5194/bg-19-3469-2022, https://doi.org/10.5194/bg-19-3469-2022, 2022
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Deterioration of low-oxygen conditions in the coastal waters off Hong Kong was revealed by monitoring data over two decades. The declining wind forcing and the increasing nutrient input contributed significantly to the areal expansion and intense deterioration of low-oxygen conditions. Also, the exacerbated eutrophication drove a shift in the dominant source of organic matter from terrestrial inputs to in situ primary production, which has probably led to an earlier onset of hypoxia in summer.
Stella-Theresa Stoicescu, Jaan Laanemets, Taavi Liblik, Māris Skudra, Oliver Samlas, Inga Lips, and Urmas Lips
Biogeosciences, 19, 2903–2920, https://doi.org/10.5194/bg-19-2903-2022, https://doi.org/10.5194/bg-19-2903-2022, 2022
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Coastal basins with high input of nutrients often suffer from oxygen deficiency. In summer 2018, the extent of oxygen depletion was exceptional in the Gulf of Riga. We analyzed observational data and found that extensive oxygen deficiency appeared since the water layer close to the seabed, where oxygen is consumed, was separated from the surface layer. The problem worsens if similar conditions restricting vertical transport of oxygen occur more frequently in the future.
Justin C. Tiano, Jochen Depestele, Gert Van Hoey, João Fernandes, Pieter van Rijswijk, and Karline Soetaert
Biogeosciences, 19, 2583–2598, https://doi.org/10.5194/bg-19-2583-2022, https://doi.org/10.5194/bg-19-2583-2022, 2022
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This study gives an assessment of bottom trawling on physical, chemical, and biological characteristics in a location known for its strong currents and variable habitats. Although trawl gears only removed the top 1 cm of the seabed surface, impacts on reef-building tubeworms significantly decreased carbon and nutrient cycling. Lighter trawls slightly reduced the impact on fauna and nutrients. Tubeworms were strongly linked to biogeochemical and faunal aspects before but not after trawling.
Inda Brinkmann, Christine Barras, Tom Jilbert, Tomas Næraa, K. Mareike Paul, Magali Schweizer, and Helena L. Filipsson
Biogeosciences, 19, 2523–2535, https://doi.org/10.5194/bg-19-2523-2022, https://doi.org/10.5194/bg-19-2523-2022, 2022
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The concentration of the trace metal barium (Ba) in coastal seawater is a function of continental input, such as riverine discharge. Our geochemical records of the severely hot and dry year 2018, and following wet year 2019, reveal that prolonged drought imprints with exceptionally low Ba concentrations in benthic foraminiferal calcium carbonates of coastal sediments. This highlights the potential of benthic Ba / Ca to trace past climate extremes and variability in coastal marine records.
Cited articles
Alkire, M. B., D'Asaro, E., Lee, C., Jane Perry, M., Gray, A., Cetinić,
I., Briggs, N., Rehm, E., Kallin, E., Kaiser, J., and González-Posada,
A.: Estimates of net community production and export using high-resolution,
Lagrangian measurements of O2, NO3, and POC through the evolution of a
spring diatom bloom in the North Atlantic, Deep-Sea Res. Pt. I, 64, 157–174,
https://doi.org/10.1016/j.dsr.2012.01.012, 2012.
Alkire, M. B., Lee, C., D'Asaro, E., Perry, M. J., Nathan Briggs, I. C., and
Gray, A.: Net community production and export from Seaglider measurements in
the North Atlantic after the spring bloom, J. Geophys. Res.-Oceans, 119,
6121–6139, https://doi.org/10.1002/2014JC010105, 2014.
Anderson, L. A. and Sarmiento, J. L.: Redfield ratios of remineralization
determined by nutrient data analysis, Global Biogeochem. Cy., 8,
65–80, https://doi.org/10.1029/93GB03318, 1994.
Beale, R., Johnson, M. T., Liss, P. S., and Nightingale, P. D.: Air-Sea
Exchange of Marine Trace Gases, in: Treatise On Geochemistry, edited by:
Holland, H. D. and Turekian, K. K., chap. 603, Elsevier Science &
Technology, 2nd edn.,
https://doi.org/10.1016/B978-0-08-095975-7.00603-3, 2013.
Benson, B. B. and Krause, D.: The concentration and isotopic fractionation of
oxygen dissolved in freshwater and seawater in equilibrium with the
atmosphere, Limnol. Oceanogr., 29, 620–632,
https://doi.org/10.4319/lo.1984.29.3.0620, 1984.
Blauw, A. N., Benincà, E., Laane, R. W. P. M., Greenwood, N., and
Huisman, J.: Dancing with the Tides: Fluctuations of Coastal Phytoplankton
Orchestrated by Different Oscillatory Modes of the Tidal Cycle, PLoS ONE, 7,
e49319, https://doi.org/10.1371/journal.pone.0049319, 2012.
Bozec, Y., Thomas, H., Schiettecatte, L.-S., Borges, A. V., Elkalay, K., and
de Baar, H. J. W.: Assessment of the processes controlling the seasonal
variations of dissolved inorganic carbon in the North Sea, Limnol. Oceanogr.,
51, 2746–2762, https://doi.org/10.4319/lo.2006.51.6.2746, 2006.
Braeckman, U., Van Colen, C., Guilini, K., Van Gansbeke, D., Soetaert, K.,
Vincx, M., and Vanaverbeke, J.: Empirical evidence reveals seasonally
dependent reduction in nitrification in coastal sediments subjected to near
future ocean acidification, PloS one, 9, e108153,
https://doi.org/10.1371/journal.pone.0108153, 2014.
Bushinsky, S. M. and Emerson, S.: A method for in-situ calibration of
Aanderaa oxygen sensors on surface moorings, Mar. Chem., 155, 22–28, 2013.
Carnell, R.: lhs: Latin Hypercube Samples,
https://cran.r-project.org/web/packages/lhs/, 2012.
D'Asaro, E. A. and McNeil, C.: Calibration and Stability of Oxygen Sensors on
Autonomous Floats, J. Atmos. Ocean. Technol., 30,
1896–1906, https://doi.org/10.1175/JTECH-D-12-00222.1, 2013.
Duarte, C. M., Regaudie-de Gioux, A., Arrieta, J. M., Delgado-Huertas, A.,
and Agustí, S.: The oligotrophic ocean is heterotrophic., Annu. Rev.
Mar. Sci., 5, 551–69, https://doi.org/10.1146/annurev-marine-121211-172337, 2013.
Ducklow, H. W. and Doney, S. C.: What is the metabolic state of the
oligotrophic ocean? A debate., Annu. Rev. Mar. Sci., 5, 525–33,
https://doi.org/10.1146/annurev-marine-121211-172331, 2013.
Emerson, S.: Seasonal oxygen cycles and biological new production in surface
waters of the subarctic Pacific Ocean, J. Geophys. Res., 92, 6535,
https://doi.org/10.1029/JC092iC06p06535, 1987.
Emerson, S.: Annual net community production and the biological carbon flux
in the ocean, Global Biogeochem. Cy., 28, 1–12, https://doi.org/10.1002/2013GB004680,
2014.
Emerson, S. and Stump, C.: Net biological oxygen production in the ocean-II:
Remote in situ measurements of O2 and N2 in subarctic pacific surface
waters, Deep-Sea Res. Pt. I, 57, 1255–1265, https://doi.org/10.1016/j.dsr.2010.06.001,
2010.
Emerson, S., Stump, C., and Nicholson, D.: Net biological oxygen production
in the ocean: Remote in situ measurements of O2 and N2 in surface
waters, Global Biogeochem. Cy., 22, GB3023, https://doi.org/10.1029/2007GB003095, 2008.
Fernand, L., Weston, K., Morris, T., Greenwood, N., Brown, J., and Jickells,
T.: The contribution of the deep chlorophyll maximum to primary production in
a seasonally stratified shelf sea, the North Sea, Biogeochemistry, 113,
153–166, https://doi.org/10.1007/s10533-013-9831-7, 2013.
Foden, J., Sivyer, D., Mills, D., and Devlin, M.: Spatial and temporal
distribution of chromophoric dissolved organic matter (CDOM) fluorescence and
its contribution to light attenuation in UK waterbodies, Estuar. Coast. Shelf
Sci., 79, 707–717, https://doi.org/10.1016/j.ecss.2008.06.015, 2008.
Foden, J., Devlin, M. J., Mills, D. K., and Malcolm, S. J.: Searching for
undesirable disturbance: an application of the OSPAR eutrophication
assessment method to marine waters of England and Wales, Biogeochemistry,
106, 157–175, https://doi.org/10.1007/s10533-010-9475-9, 2010.
Frew, N. M.: The role of organic films in air-sea gas exchange, in: The Sea
Surface and Global Change, edited by: Liss, P. S. and Duce, R. A., 121–172,
Cambridge University Press, https://doi.org/10.1017/CBO9780511525025.006, 1997.
García, H. E. and Gordon, L. I.: Oxygen solubility in seawater: Better
fitting equations, Limnol. Oceanogr., 37, 1307–1312,
https://doi.org/10.4319/lo.1992.37.6.1307, 1992.
Greenwood, N., Parker, E. R., Fernand, L., Sivyer, D. B., Weston, K.,
Painting, S. J., Kröger, S., Forster, R. M., Lees, H. E., Mills, D. K.,
and Laane, R. W. P. M.: Detection of low bottom water oxygen concentrations
in the North Sea; implications for monitoring and assessment of ecosystem
health, Biogeosciences, 7, 1357–1373, https://doi.org/10.5194/bg-7-1357-2010, 2010.
Guo, X., Cai, W.-J., Huang, W.-J., Wang, Y., Chen, F., Murrell, M. C.,
Lohrenz, S. E., Jiang, L.-Q., Dai, M., Hartmann, J., Lin, Q., and Culp, R.:
Carbon dynamics and community production in the Mississippi River plume,
Limnol. Oceanogr., 57, 1–17, https://doi.org/10.4319/lo.2012.57.1.0001, 2012.
Hansen, H. P.: Determination of oxygen, in: Methods of Seawater Analysis,
edited by Grasshoff, K., Kremling, K., and Ehrhardt, M., chap. 4, Wiley-VCH
Verlag GmbH, https://doi.org/10.1002/9783527613984.ch4, 1999.
Hedges, J., Baldock, J., Gélinas, Y., Lee, C., Peterson, M., and
Wakeham, S.: The biochemical and elemental compositions of marine plankton: A
NMR perspective, Mar. Chem., 78, 47–63, https://doi.org/10.1016/S0304-4203(02)00009-9,
2002.
Helm, I., Jalukse, L., Vilbaste, M., and Leito, I.: Micro-Winkler titration
method for dissolved oxygen concentration measurement, Anal. Chim. Ac., 648,
167–73, https://doi.org/10.1016/j.aca.2009.06.067, 2009.
Hull, T. and Johnson, M.: Airsea: R tools for air-sea gas exchange studies
(0.2), Zenodo, https://doi.org/10.5281/zenodo.45656, 2015.
Jickells, T. D.: Nutrient Biogeochemistry of the Coastal Zone, Science, 281,
217–222, https://doi.org/10.1126/science.281.5374.217, 1998.
Kaiser, J., Reuer, M. K., Barnett, B., and Bende, M. L.: Marine productivity
estimates from continuous O2/Ar ratio measurements by membrane inlet mass
spectrometry, Geophys. Res. Lett., 32, L19605, https://doi.org/10.1029/2005GL023459,
2005.
Kaiser, J. and Gist, N.: The metabolic balance of the surface ocean along two
Atlantic Meridional Transects, Geophysical Research Abstracts, 8, 08599,
2006.
Karl, D. M., Laws, E. A., Morris, P., Williams, P. J. L., and Emerson, S.:
Global carbon cycle: metabolic balance of the open sea, Nature, 426, 32,
https://doi.org/10.1038/426032a, 2003.
Keeling, R. F. and Shertz, S. R.: Seasonal and interannual variations in
atmospheric oxygen and implications for the global carbon cycle, Nature, 358,
723–727, https://doi.org/10.1038/358723a0, 1992.
Kitidis, V., Tilstone, G. H., Serret, P., Smyth, T. J., Torres, R., and
Robinson, C.: Oxygen photolysis in the Mauritanian upwelling: Implications
for net community production, Limnol. Oceanogr., 59, 299–310,
https://doi.org/10.4319/lo.2014.59.2.0299, 2014.
Large, W. G. and Pond, S.: Open Ocean Momentum Flux Measurements in Moderate
to Strong Winds, J. Phys. Oceanogr., 11, 324–336,
https://doi.org/10.1175/1520-0485(1981)011<0324:OOMFMI>2.0.CO;2, 1981.
Liang, J.-H., Deutsch, C., McWilliams, J. C., Baschek, B., Sullivan, P. P.,
and Chiba, D.: Parameterizing bubble-mediated air-sea gas exchange and its
effect on ocean ventilation, Global Biogeochem. Cy., 894–905,
https://doi.org/10.1002/gbc.20080, 2013.
Liu, W., Tang, W., and Xie, X.: Wind Power at Sea as Observed from Space, in:
Wind power, edited by: Muyeen, S. M., June, chap. 14, InTech,
https://doi.org/10.5772/8344, 2010.
Marino, S., Hogue, I. B., Ray, C. J., and Kirschner, D. E.: A methodology for
performing global uncertainty and sensitivity analysis in systems biology,
https://doi.org/10.1016/j.jtbi.2008.04.011, 2008.
McNeil, C. L. and D'Asaro, E. a.: A calibration equation for oxygen optodes
based on physical properties of the sensing foil, Limnol. Oceanogr., Methods,
12, 139–154, https://doi.org/10.4319/lom.2014.12.139, 2014.
Mills, D., Greenwood, N., Kröger, S., Devlin, M., Sivyer, D., Pearce,
D., Cutchey, S., and Malcolm, S.: New approaches to improve the detection of
eutrophication in UK coastal waters, Environmental Research, Engineering and
Management, 2, 36–42, 2005.
Mouriño-Carballido, B. and Anderson, L. a.: Net community production of
oxygen derived from in vitro and in situ 1-D modeling techniques in a
cyclonic mesoscale eddy in the Sargasso Sea, Biogeosciences, 6, 1799–1810,
https://doi.org/10.5194/bg-6-1799-2009, 2009.
Neukermans, G., Ruddick, K. G., and Greenwood, N.: Diurnal variability of
turbidity and light attenuation in the southern North Sea from the SEVIRI
geostationary sensor, Remote Sens. Environ., 124, 564–580,
https://doi.org/10.1016/j.rse.2012.06.003, 2012.
Nicholson, D., Emerson, S., and Eriksen, C. C.: Net community production in
the deep euphotic zone of the subtropical North Pacific gyre from glider
surveys, Limnol. Oceanogr., 53, 2226–2236,
https://doi.org/10.4319/lo.2008.53.5_part_2.2226, 2008.
Nightingale, P. D., Malin, G., Law, C. S., Watson, A. J., Liss, P. S.,
Liddicoat, M. I., Boutin, J., and Upstill-Goddard, R. C.: In situ evaluation
of air-sea gas exchange parameterizations using novel conservative and
volatile tracers, Global Biogeochem. Cy., 14, 373–387,
https://doi.org/10.1029/1999GB900091, 2000.
Nunes, T., Stevenson, M., Heuer, C., Marshall, J., Sanchez, J., Thornton, R.,
Reiczigel, J., Robison-Cox, J., Sebastiani, P., Solymos, P., and Yoshida, K.:
epiR: An R package for the analysis of epidemiological data, 2014.
Ostle, C., Johnson, M., Landschützer, P., Schuster, U., Hartman, S.,
Hull, T., and Robinson, C.: Net Community Production in the North Atlantic
Ocean derived from Volunteer Observing Ship data, Global Biogeochem. Cy.,
80–95, https://doi.org/10.1002/2014GB004868, 2014.
Palevsky, H. I., Ribalet, F., Swalwell, J. E., Cosca, C. E., Cokelet, E. D.,
Feely, R. A., Armbrust, E. V., and Quay, P. D.: The influence of net
community production and phytoplankton community structure on CO2 uptake
in the Gulf of Alaska, Global Biogeochem. Cy., 27, 664–676,
https://doi.org/10.1002/gbc.20058, 2013.
Platt, T. and Sathyendranath, S.: Ecological indicators for the pelagic zone
of the ocean from remote sensing, Remote Sens. Environ., 112, 3426–3436,
https://doi.org/10.1016/j.rse.2007.10.016, 2008.
Polton, J. A., Palmer, M. R., and Howarth, M.: The vertical structure of
time-mean estuarine circulation in a shallow, rotating, semi-enclosed coastal
bay: A Liverpool Bay case study with application for monitoring, Cont.
Shelf Res., 59, 115–126, 2013.
Pujol, G., Iooss, B., and Janon, A.: Sensitivity,
https://cran.r-project.org/web/packages/sensitivity/, 2014.
Reuer, M. K., Barnett, B. a., Bender, M. L., Falkowski, P. G., and Hendricks,
M. B.: New estimates of Southern Ocean biological production rates from O2/Ar
ratios and the triple isotope composition of O2, Deep-Sea Res. Pt. I, 54,
951–974, https://doi.org/10.1016/j.dsr.2007.02.007, 2007.
Riser, S. C. and Johnson, K. S.: Net production of oxygen in the subtropical
ocean., Nature, 451, 323–5, https://doi.org/10.1038/nature06441, 2008.
Saltelli, A., Chan, K., and Scott, E. M.: Sensitivity analysis, J. Wiley &
sons, 2000.
Sanchez, M. A. and Blower, S. M.: Uncertainty and sensitivity analysis of the
basic reproductive rate. Tuberculosis as an example, Am. J. Epidemiol., 145,
1127–37, 1997.
Stanley, R. H. R., Jenkins, W. J., Lott, D. E., and Doney, S. C.: Noble gas
constraints on air-sea gas exchange and bubble fluxes, J. Geophys. Res., 114,
C11020, https://doi.org/10.1029/2009JC005396, 2009.
Stanley, R. H. R., Kirkpatrick, J. B., Cassar, N., Barnett, B. a., and
Bender, M. L.: Net community production and gross primary production rates in
the western equatorial Pacific, Global Biogeochem. Cy., 24, GB4001,
https://doi.org/10.1029/2009GB003651, 2010.
Stocki, R.: A method to improve design reliability using optimal Latin
hypercube sampling, Computer Assisted Mechanics and Engineering Sciences, 12,
393–411, 2005.
Sullivan, P. P., Romero, L., McWilliams, J. C., and Melville, W. K.:
Transient Evolution of Langmuir Turbulence in Ocean Boundary Layers Driven by
Hurricane Winds and Waves, J. Phys. Oceanogr., 42, 1959–1980,
https://doi.org/10.1175/JPO-D-12-025.1, 2012.
Takagaki, N. and Komori, S.: Effects of rainfall on mass transfer across the
air-water interface, J. Geophys. Res., 112, C06006,
https://doi.org/10.1029/2006JC003752, 2007.
Tengberg, A., Hovdenes, J., Andersson, H., Brocandel, O., Diaz, R., Hebert,
D., Arnerich, T., Huber, C., Kortzinger, A., Khripounoff, A., Rey, F.,
Ronning, C., Schimanski, J., Sommer, S., and Stangelmayer, A.: Evaluation of
a lifetime-based optode to measure oxygen in aquatic systems, Limnol.
Oceanogr.-Methods, 4, 7–17, 2006.
Thomas, A., Byrne, D., and Weatherbee, R.: Coastal sea surface temperature
variability from Landsat infrared data, Remote Sens. Environ., 81, 262–272,
https://doi.org/10.1016/S0034-4257(02)00004-4, 2002.
Tijssen, S. and Eijgenraam, A.: Primary and community production in the
southern bight of the north sea deduced from oxygen concentration variations
in the spring of 1980, Neth. J. Sea Res., 16, 247–259,
https://doi.org/10.1016/0077-7579(82)90034-5, 1982.
Tilstone, G. H., Xie, Y., Robinson, C., Serret, P., Raitsos, D. E., Powell,
T., Aranguren-Gassis, M., Garcia-Martin, E. E., Kitidis, V.: Satellite
estimates of net community production indicate predominance of net autotrophy
in the Atlantic Ocean, Remote Sens. Environ., 164, 254–269,
https://doi.org/10.1016/j.rse.2015.03.017, 2015.
Trimmer, M., Nedwell, D., Sivyer, D., and Malcolm, S.: Seasonal benthic
organic matter mineralisation measured by oxygen uptake and denitrification
along a transect of the inner and outer River Thames estuary, UK, Mar.
Ecol.-Progr. Ser., 197, 103–119, https://doi.org/10.3354/meps197103, 2000.
Wanninkhof, R.: Relationship between wind speed and gas exchange over the
ocean revisited, Limnol. Oceanogr.-Methods, 12, 351–362,
https://doi.org/10.4319/lom.2014.12.351, 2014.
Wanninkhof, R., Asher, W. E., Ho, D. T., Sweeney, C., and McGillis, W. R.:
Advances in Quantifying Air-Sea Gas Exchange and Environmental Forcing*,
Annu. Rev. Mar. Sci., 1, 213–244,
https://doi.org/10.1146/annurev.marine.010908.163742, 2009.
Weston, K.: Primary production in the deep chlorophyll maximum of the central
North Sea, J. Plankton Res., 27, 909–922, https://doi.org/10.1093/plankt/fbi064, 2005.
Weston, K., Greenwood, N., Fernand, L., Pearce, D. J., and Sivyer, D. B.:
Environmental controls on phytoplankton community composition in the Thames
plume, UK, J. Sea Res., 60, 246–254, https://doi.org/10.1016/j.seares.2008.09.003,
2008.
Wikner, J., Panigrahi, S., Nydahl, A., Lundberg, E., Bamstedt, U., and
Tengberg, A.: Precise continuous measurements of pelagic respiration in
coastal waters with Oxygen Optodes, Limnol. Oceanogr.-Methods, 11, 1–15,
https://doi.org/10.4319/lom.2013.11.1, 2013.
Wiliams, P. J. L. and Jenkinson, N. W.: A transportable
microprocessor-controlled precise Winkler titration suitable for field
station and shipboard use, Limnol. Oceanogr., 27, 576–584,
https://doi.org/10.4319/lo.1982.27.3.0576, 1982.
Williams, P. J. L.: On the definition of plankton production terms, ICES
Marine Science Symposia, 197, 9–19, 1993.
Williams, P. J. L. B., Quay, P. D., Westberry, T. K., and Behrenfeld, M. J.:
The oligotrophic ocean is autotrophic., Annu. Rev. Mar. Sci., 5, 535–49,
https://doi.org/10.1146/annurev-marine-121211-172335, 2013.
Woolf, D. K. and Thorpe, S. A.: Bubbles and the air-sea exchange of gases in
near-saturation conditions, J. Mar. Res., 49, 435–466,
https://doi.org/10.1357/002224091784995765, 1991.
Short summary
We explore the estimation of NCP using an oxygen time series from a surface mooring located in the River Thames plume. Our study site is identified as a region of net heterotrophy with strong seasonal variability. Short-term daily variability in oxygen and horizontal advection is demonstrated to make accurate estimates challenging. The effects of bubble-induced supersaturation is shown to have a large influence on cumulative annual estimates.
We explore the estimation of NCP using an oxygen time series from a surface mooring located in...
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