reference : Reduced biomass burning emissions reconcile conflicting estimates of the post-2006 atmospheric methane budget

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reftype Journal Article
Abstract Several viable but conflicting explanations have been proposed to explain the recent ~8 p.p.b. per year increase in atmospheric methane after 2006, equivalent to net emissions increase of ~25 Tg CH4 per year. A concurrent increase in atmospheric ethane implicates a fossil source; a concurrent decrease in the heavy isotope content of methane points toward a biogenic source, while other studies propose a decrease in the chemical sink (OH). Here we show that biomass burning emissions of methane decreased by 3.7 (+/-1.4) Tg CH4 per year from the 2001-2007 to the 2008-2014 time periods using satellite measurements of CO and CH4, nearly twice the decrease expected from prior estimates. After updating both the total and isotopic budgets for atmospheric methane with these revised biomass burning emissions (and assuming no change to the chemical sink), we find that fossil fuels contribute between 12-19 Tg CH4 per year to the recent atmospheric methane increase, thus reconciling the isotopic- and ethane-based results.
Accession Number 29263323
Author Worden, J. R.; Bloom, A. A.; Pandey, S.; Jiang, Z.; Worden, H. M.; Walker, T. W.; Houweling, S.; Rockmann, T.
Author Address Jet Propulsion Laboratory, California Institute for Technology, Pasadena, 91109, CA, USA. john.r.worden@jpl.nasa.gov. Jet Propulsion Laboratory, California Institute for Technology, Pasadena, 91109, CA, USA. Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, The Netherlands. SRON Netherlands Institute for Space Research, Utrecht, The Netherlands. National Center for Atmospheric Research, Boulder, 80301, CO, USA. Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
DOI 10.1038/s41467-017-02246-0
Date Dec 20
ISSN 2041-1723 (Electronic) 2041-1723 (Linking)
Issue 1
Journal Nature Communications
Notes Worden, John R Bloom, A Anthony Pandey, Sudhanshu Jiang, Zhe Worden, Helen M Walker, Thomas W Houweling, Sander Rockmann, Thomas eng England 2017/12/22 06:00 Nat Commun. 2017 Dec 20;8(1):2227. doi: 10.1038/s41467-017-02246-0.
PMCID PMC5738352
Pages 2227
Title Reduced biomass burning emissions reconcile conflicting estimates of the post-2006 atmospheric methane budget
Volume 8
Year 2017
Bibliographic identifiers
_record_number 164
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