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Science 17 November 2000:
Vol. 290. no. 5495, pp. 1342 - 1346
DOI: 10.1126/science.290.5495.1342
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Reports

Regional Changes in Carbon Dioxide Fluxes of Land and Oceans Since 1980 

Philippe Bousquet,12* Philippe Peylin,1 Philippe Ciais,1 Corinne Le Quéré,1dagger Pierre Friedlingstein,1 Pieter P. Tans3

We have applied an inverse model to 20 years of atmospheric carbon dioxide measurements to infer yearly changes in the regional carbon balance of oceans and continents. The model indicates that global terrestrial carbon fluxes were approximately twice as variable as ocean fluxes between 1980 and 1998. Tropical land ecosystems contributed most of the interannual changes in Earth's carbon balance over the 1980s, whereas northern mid- and high-latitude land ecosystems dominated from 1990 to 1995. Strongly enhanced uptake of carbon was found over North America during the 1992-1993 period compared to 1989-1990.

1 Laboratoire des Sciences du Climat et de l'Environnement (LSCE), F-91198 Gif-sur-Yvette Cedex, France.
2 Université de Versailles Saint Quentin en Yvelines (UVSQ), F-78035 Versailles Cedex, France.
3 National Oceanic and Atmospheric Administration (NOAA), Climate Monitoring and Diagnostics Laboratory, Boulder, CO 80303, USA.
*   To whom correspondence should be addressed. E-mail: pbousquet{at}cea.fr

dagger    Present address: Max-Planck-Institut für Biogeochemie, D-07701 Jena, Germany.

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