Seven years of recent European net terrestrial carbon dioxide exchange constrained by atmospheric observations

Peters, W, Krol, MC, Vander Werf, GR, Houweling, S, Jones, CD, Hughes, J, Schaefer, K, Masarie, KA, Jacobson, AR, Miller, JB, Cho, CH, Ramonet, M, Schmidt, M, Ciattaglia, L, Apadula, F, Heltai, D, Meindhardt, F, Di Sarra, AG, Piacentino, S, Sferlazzo, D, Aalto, T, Hatakka, J, Strom, J, Haszpra, L, Meijer, HAJ, Van Der Laan, S, Neubert, REM, Jordan, A, Rodo, X, Morgui, J-A, Vermeulen, AT, Popa, E, Rozanski, K, Zimnoch, M, Manning, AC ORCID:, Leuenberger, M, Uglietti, C, Dolman, AJ, Ciais, P, Heimann, M and Tans, P (2010) Seven years of recent European net terrestrial carbon dioxide exchange constrained by atmospheric observations. Global Change Biology, 16 (4). pp. 1317-1337. ISSN 1365-2486

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We present an estimate of net ecosystem exchange (NEE) of CO2 in Europe for the years 2001-2007. It is derived with a data assimilation that uses a large set of atmospheric CO2 mole fraction observations (~70 000) to guide relatively simple descriptions of terrestrial and oceanic net exchange, while fossil fuel and fire emissions are prescribed. Weekly terrestrial sources and sinks are optimized (i.e., a flux inversion) for a set of 18 large ecosystems across Europe in which prescribed climate, weather, and surface characteristics introduce finer scale gradients. We find that the terrestrial biosphere in Europe absorbed a net average of -165 Tg C yr-1 over the period considered. This uptake is predominantly in non-EU countries, and is found in the northern coniferous (-94 Tg C yr-1) and mixed forests (-30 Tg C yr-1) as well as the forest/field complexes of eastern Europe (-85 Tg C yr-1). An optimistic uncertainty estimate derived using three biosphere models suggests the uptake to be in a range of -122 to -258 Tg C yr-1, while a more conservative estimate derived from the a-posteriori covariance estimates is -165±437 Tg C yr-1. Note, however, that uncertainties are hard to estimate given the nature of the system and are likely to be significantly larger than this. Interannual variability in NEE includes a reduction in uptake due to the 2003 drought followed by 3 years of more than average uptake. The largest anomaly of NEE occurred in 2005 concurrent with increased seasonal cycles of observed CO2. We speculate these changes to result from the strong negative phase of the North Atlantic Oscillation in 2005 that lead to favorable summer growth conditions, and altered horizontal and vertical mixing in the atmosphere. All our results are available through

Item Type: Article
Uncontrolled Keywords: atmospheric co(2),carbon exchange,data assimilation,north-atlantic oscillation,transport models,tracer transport,complex terrain,regional-scale,co2 inversions,part 1,climate,fluxes,land,sdg 13 - climate action,sdg 15 - life on land ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School: Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017)
Faculty of Science > Research Groups > Atmospheric Chemistry (former - to 2018)
Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017)
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
University of East Anglia Schools > Faculty of Science > Tyndall Centre for Climate Change Research
Faculty of Science > Research Centres > Tyndall Centre for Climate Change Research
Depositing User: Rosie Cullington
Date Deposited: 15 Feb 2011 16:08
Last Modified: 23 Oct 2022 01:36
DOI: 10.1111/j.1365-2486.2009.02078.x

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