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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
CO
2
surface fluxes at grid point scale estimated from a global 21 year reanalysis of atmospheric measurements
Journal of Geophysical Research Atmospheres, Volume 115, No. 21, Article D21307, Year 2010
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Description
This paper documents a global Bayesian variational inversion of CO 2 surface fluxes during the period 1988-2008. Weekly fluxes are estimated on a 3.75 × 2.5 (longitude-latitude) grid throughout the 21 years. The assimilated observations include 128 station records from three large data sets of surface CO2 mixing ratio measurements. A Monte Carlo approach rigorously quantifies the theoretical uncertainty of the inverted fluxes at various space and time scales, which is particularly important for proper interpretation of the inverted fluxes. Fluxes are evaluated indirectly against two independent CO2 vertical profile data sets constructed from aircraft measurements in the boundary layer and in the free troposphere. The skill of the inversion is evaluated by the improvement brought over a simple benchmark flux estimation based on the observed atmospheric growth rate. Our error analysis indicates that the carbon budget from the inversion should be more accurate than the a priori carbon budget by 20% to 60% for terrestrial fluxes aggregated at the scale of subcontinental regions in the Northern Hemisphere and over a year, but the inversion cannot clearly distinguish between the regional carbon budgets within a continent. On the basis of the independent observations, the inversion is seen to improve the fluxes compared to the benchmark: the atmospheric simulation of CO2 with the Bayesian inversion method is better by about 1 ppm than the benchmark in the free troposphere, despite possible systematic transport errors. The inversion achieves this improvement by changing the regional fluxes over land at the seasonal and at the interannual time scales. Copyright © 2010 by the American Geophysical Union.
Authors & Co-Authors
Chevallier, Frédéric
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Ciais, Philippe
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Conway, T. J.
United States, Boulder
Noaa Earth System Research Laboratory
Aalto, T.
Finland, Helsinki
Finnish Meteorological Institute
Anderson, B. E.
United States, Hampton
Nasa Langley Research Center
Bousquet, Philippe
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Brunke, Ernst Günther
South Africa, Pretoria
South African Weather Service
Ciattaglia, L.
Italy, Rome
Consiglio Nazionale Delle Ricerche
Esaki, Y.
Japan, Tokyo
Japan Meteorological Agency
Fröhlich, M.
Austria, Vienna
Environment Agency Austria
Gomez, A.
New Zealand, Auckland
National Institute of Water and Atmospheric Research
Gomez-Pelaez, A. J.
Spain, Santa Cruz de Tenerife
Meteorological State Agency of Spain
Haszpra, L.
Hungary, Budapest
Országos Meteorológiai Szolgálat
Krummel, Paul B.
Australia, Hobart
Csiro Marine and Atmospheric Research
Langenfelds, Ray L.
Australia, Hobart
Csiro Marine and Atmospheric Research
Leuenberger, Markus
Switzerland, Bern
University of Bern
MacHida, T.
Japan, Tsukuba
National Institute for Environmental Studies of Japan
Maignan, F.
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Matsueda, H.
Japan, Tsukuba
Meteorological Research Institute
Morguí, J. A.
Spain, Barcelona
Laboratori de Recerca Del Clima
Mukai, H.
Japan, Tsukuba
National Institute for Environmental Studies of Japan
Nakazawa, T.
Japan, Sendai
Tohoku University
Peylin, P.
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Ramonet, Michel
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Rivier, L.
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Sawa, Y.
Japan, Tsukuba
Meteorological Research Institute
Schmidt, Martina
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Steele, Lloyd Paul
Australia, Hobart
Csiro Marine and Atmospheric Research
Vay, S. A.
United States, Hampton
Nasa Langley Research Center
Vermeulen, A. T.
Netherlands, The Hague
Nederlandse Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek- Tno
Wofsy, S.
United States, Cambridge
Harvard University
Worthy, Douglas E.J.
Canada, Gatineau
Environment and Climate Change Canada
Statistics
Citations: 402
Authors: 32
Affiliations: 20
Identifiers
Doi:
10.1029/2010JD013887
ISSN:
01480227
Research Areas
Environmental