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Source attribution of the changes in atmospheric methane for 2006–2008

Bousquet, P. and Ringeval, B. and Pison, I. and Dlugokencky, E. J. and Brunke, E.-G. and Carouge, Claire C. and Chevallier, F. and Fortems-Cheiney, A. and Frankenberg, C. and Hauglustaine, D. A. and Krummel, P. B. and Langenfelds, R. L. and Ramonet, M. and Schmidt, M. and Steele, L. P. and Szopa, S. and Yver, C. and Viovy, N. and Ciais, P. (2011) Source attribution of the changes in atmospheric methane for 2006–2008. Atmospheric Chemistry and Physics, 11 (8). pp. 3689-3700. ISSN 1680-7316. https://resolver.caltech.edu/CaltechAUTHORS:20150508-133833330

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.5194/acp-11-3689-2011DOIArticle
http://www.atmos-chem-phys.net/11/3689/2011/acp-11-3689-2011.htmlPublisherArticle
http://dx.doi.org/10.5194/acp-12-9381-2012ErrataCorrigendum
http://www.atmos-chem-phys.net/12/9381/2012/acp-12-9381-2012.htmlErrataCorrigendum
ORCID:
AuthorORCID
Dlugokencky, E. J.0000-0003-0612-6985
Chevallier, F.0000-0002-4327-3813
Frankenberg, C.0000-0002-0546-5857
Ciais, P.0000-0001-8560-4943
Additional Information:© Author(s) 2011. CC Attribution 3.0 License. Received 27 October 2010; Published in Atmos. Chem. Phys. Discuss. 12 November 2010; Revised 29 March 2011; Accepted 8 April 2011; Published 20 April 2011. French Atomic agency (CEA) and Laboratoire des Sciences du Climat et de l’Environnement (LSCE) are to be thanked for providing computing time to this work. Part of this work is funded by French CNRS and by EU projects HYMN (Peter van Velthoven) and NITROEUROPE (inversion component: Peter Bergamaschi). We acknowledge G. Van der Werf for providing CH_4 emissions from fires and J. Kaplan for providing the CH_4 emission maps from wetlands, to the NITROEUROPE project. We acknowledge the TRANSCOM community for the region map used in this work. Nathalie de Noblet (LSCE) and Pierre Friedlingstein (University of Bristol/LSCE) must be thanked for fruitful discussion on ORCHIDEE model. C. Prigent (Paris observatory) and F. Papa (GISS/USA) can be thanked to have provided the inundation maps used in ORCHIDEE model for 1993–2000.
Funders:
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
European Union Project HYMNUNSPECIFIED
European Union Project NITROEUROPEUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20150508-133833330
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150508-133833330
Official Citation:Bousquet, P., Ringeval, B., Pison, I., Dlugokencky, E. J., Brunke, E. G., Carouge, C., . . . Ciais, P. (2011). Source attribution of the changes in atmospheric methane for 2006–2008. Atmos. Chem. Phys., 11(8), 3689-3700. doi: 10.5194/acp-11-3689-2011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57384
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:11 May 2015 23:03
Last Modified:09 Mar 2020 13:18

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