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Title: Role of regional wetland emissions in atmospheric methane variability
Authors: McNorton, J.
Gloor, E.
Wilson, C.
Hayman, G. D.
Gedney, N.
Comyn-Platt, E.
Marthews, T.
Parker, R. J.
Boesch, H.
Chipperfield, M. P.
First Published: 19-Oct-2016
Publisher: American Geophysical Union (AGU), Wiley
Citation: Geophysical Research Letters, 2016 in press
Abstract: Atmospheric methane (CH4) accounts for ~20% of the total direct anthropogenic radiative forcing by long-lived greenhouse gases. Surface observations show a pause (1999-2006) followed by a resumption in CH4 growth, which remain largely unexplained. Using a land surface model, we estimate wetland CH4 emissions from 1993 to 2014 and study the regional contributions to changes in atmospheric CH4. Atmospheric model simulations using these emissions, together with other sources, compare well with surface and satellite CH4 data. Modelled global wetland emissions vary by ±3%/yr (σ = 4.8 Tg), mainly due to precipitation-induced changes in wetland area, but the integrated effect makes only a small contribution to the pause in CH4 growth from 1999 to 2006. Increasing temperature, which increases wetland area, drives a long-term trend in wetland CH4 emissions of +0.2%/yr (1999 to 2014). The increased growth post-2006 was partly caused by increased wetland emissions (+3%), mainly from Tropical Asia, Sourthern Africa and Australia.
DOI Link: 10.1002/2016GL070649
ISSN: 0094-8276
eISSN: 1944-8007
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website.
Description: All model data used in this study are available through the University of Leeds ftp server, for access please contact
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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