Europe's terrestrial biosphere absorbs 7 to 12% of European anthropogenic CO2 emissions |
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| Authors: | Janssens Ivan A Freibauer Annette Ciais Philippe Smith Pete Nabuurs Gert-Jan Folberth Gerd Schlamadinger Bernhard Hutjes Ronald W A Ceulemans Reinhart Schulze E-Detlef Valentini Riccardo Dolman A Johannes |
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| Institution: | Department of Biology, Universiteit Antwerpen, B-2160 Antwerpen, Belgium. ijanssen@uia.ua.ac.be |
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| Abstract: | Most inverse atmospheric models report considerable uptake of carbon dioxide in Europe's terrestrial biosphere. In contrast, carbon stocks in terrestrial ecosystems increase at a much smaller rate, with carbon gains in forests and grassland soils almost being offset by carbon losses from cropland and peat soils. Accounting for non-carbon dioxide carbon transfers that are not detected by the atmospheric models and for carbon dioxide fluxes bypassing the ecosystem carbon stocks considerably reduces the gap between the small carbon-stock changes and the larger carbon dioxide uptake estimated by atmospheric models. The remaining difference could be because of missing components in the stock-change approach, as well as the large uncertainty in both methods. With the use of the corrected atmosphere- and land-based estimates as a dual constraint, we estimate a net carbon sink between 135 and 205 teragrams per year in Europe's terrestrial biosphere, the equivalent of 7 to 12% of the 1995 anthropogenic carbon emissions. |
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