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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Source attribution of the changes in atmospheric methane for 2006-2008
Atmospheric Chemistry and Physics, Volume 11, No. 8, Year 2011
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Description
The recent increase of atmospheric methane is investigated by using two atmospheric inversions to quantify the distribution of sources and sinks for the 2006-2008 period, and a process-based model of methane emissions by natural wetland ecosystems. Methane emissions derived from the two inversions are consistent at a global scale: emissions are decreased in 2006 (-7 Tg) and increased in 2007 (+21 Tg) and 2008 (+18 Tg), as compared to the 1999-2006 period. The agreement on the latitudinal partition of the flux anomalies for the two inversions is fair in 2006, good in 2007, and not good in 2008. In 2007, a positive anomaly of tropical emissions is found to be the main contributor to the global emission anomalies (∼60-80%) for both inversions, with a dominant share attributed to natural wetlands (∼2/3), and a significant contribution from high latitudes (∼25%). The wetland ecosystem model produces smaller and more balanced positive emission anomalies between the tropics and the high latitudes for 2006, 2007 and 2008, mainly due to precipitation changes during these years. At a global scale, the agreement between the ecosystem model and the inversions is good in 2008 but not satisfying in 2006 and 2007. Tropical South America and Boreal Eurasia appear to be major contributors to variations in methane emissions consistently in the inversions and the ecosystem model. Finally, changes in OH radicals during 2006-2008 are found to be less than 1% in inversions, with only a small impact on the inferred methane emissions. © 2011 Author(s).
Authors & Co-Authors
Bousquet, Philippe
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
France, Versailles
Université de Versailles Saint-quentin-en-yvelines
Ringeval, Bruno
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Pison, Isabelle C.
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Dlugokencky, Edward J.
United States, Washington, D.c.
National Oceanic and Atmospheric Administration
Brunke, Ernst Günther
South Africa, Pretoria
South African Weather Service
Carouge, Claire
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Chevallier, Frédéric
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Fortems-Cheiney, Audrey
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Frankenberg, Christian
United States, Pasadena
Jet Propulsion Laboratory
Hauglustaine, Didier A.
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Krummel, Paul B.
Australia, Hobart
Csiro Marine and Atmospheric Research
Langenfelds, Ray L.
United States, Pasadena
Jet Propulsion Laboratory
Ramonet, Michel
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Schmidt, Martina
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Steele, Lloyd Paul
United States, Pasadena
Jet Propulsion Laboratory
Szopa, Sophie
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Yver Kwok, Camille
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Viovy, Nicolas
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Ciais, Philippe
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Statistics
Citations: 275
Authors: 19
Affiliations: 6
Identifiers
Doi:
10.5194/acp-11-3689-2011
ISSN:
16807316
e-ISSN:
16807324
Research Areas
Environmental