Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 1 2010 10.5194/bg-7-121-2010 http://www.biogeosciences.net/7/121/2010/ http://www.biogeosciences.net/7/121/2010/bg-7-121-2010.html http://www.biogeosciences.net/7/121/2010/bg-7-121-2010.pdf 121 149 2010-01-12 From biota to chemistry and climate: towards a comprehensive description of trace gas exchange between the biosphere and atmosphere A. Arneth almut.arneth@nateko.lu.se S. Sitch A. Bondeau K. Butterbach-Bahl P. Foster N. Gedney N. de Noblet-Ducoudré I. C. Prentice M. Sanderson K. Thonicke R. Wania S. Zaehle Department of Physical Geography and Ecosystem Analysis, Lund University, Lund, Sweden Met Office Hadley Centre, Joint Centre of Hydrometeorological Research, Wallingford, UK School of Geography, University of Leeds, LS2 9JT, UK Potsdam Institute for Climate Impact Research, P.O. Box 60 12 03, 14412 Potsdam, Germany Forschungszentrum Karlsruhe, Institute for Meteorology and Climate Research (IMK-IFU), Kreuzeckbahnstr. 19, 82467 Garmisch-Partenkirchen, Germany QUEST, Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol, BS8 1RJ, UK Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Orme des Merisiers, Bat. 712 91191 GIF-SUR-YVETTE CEDEX, France Met Office Hadley Centre, Exeter, UK Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol, BS8 1RJ, UK Max Planck Institute for Biogeochemistry, Department for Biogeochemical Systems, Hans-Knöll-Str. 10, 07745 Jena, Germany now at: School of Earth and Ocean Sciences, University of Victoria, BC, V8N 1P8, Canada Exchange of non-CO₂ trace gases between the land surface and the atmosphere plays an important role in atmospheric chemistry and climate. Recent studies have highlighted its importance for interpretation of glacial-interglacial ice-core records, the simulation of the pre-industrial and present atmosphere, and the potential for large climate-chemistry and climate-aerosol feedbacks in the coming century. However, spatial and temporal variations in trace gas emissions and the magnitude of future feedbacks are a major source of uncertainty in atmospheric chemistry, air quality and climate science. To reduce such uncertainties Dynamic Global Vegetation Models (DGVMs) are currently being expanded to mechanistically represent processes relevant to non-CO₂ trace gas exchange between land biota and the atmosphere. In this paper we present a review of important non-CO₂ trace gas emissions, the state-of-the-art in DGVM modelling of processes regulating these emissions, identify key uncertainties for global scale model applications, and discuss a methodology for model integration and evaluation. % vor jede Referenz Adams, J. 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