Global wetland contribution to 2000–2012 atmospheric methane growth rate dynamics

Poulter, Benjamin; Bousquet, Philippe; Canadell, Josep G.; Ciais, Philippe; Peregon, Anna; Saunois, Marielle; Arora, Vivek K.; Beerling, David J.; Brovkin, Victor; Jones, Chris D.; Joos, Fortunat; Gedney, Nicola; Ito, Akihito; Kleinen, Thomas; Koven, Charles D.; McDonald, Kyle; Melton, Joe R.; Peng, Changhui; Peng, Shushi; Prigent, Catherine; Schroeder, Ronny; Riley, William J.; Saito, Makoto; Spahni, Renato; Tian, Hanqin; Taylor, Lyla; Viovy, Nicolas; Wilton, David; Wiltshire, Andy; Xu, Xiyan; Zhang, Bowen; Zhang, Zhen; Zhu, Qiuan

doi:10.1088/1748-9326/aa8391

Title: Global wetland contribution to 2000–2012 atmospheric methane growth rate dynamics

Journal Article · Wed Sep 13 00:00:00 EDT 2017 · Environmental Research Letters

DOI:https://doi.org/10.1088/1748-9326/aa8391· OSTI ID:1408475

^[1]; Bousquet, Philippe ^[2];

^[3]; Ciais, Philippe ^[2]; Peregon, Anna ^[2]; Saunois, Marielle ^[2]; Arora, Vivek K. ^[4]; Beerling, David J. ^[5];

^[6]; Jones, Chris D. ^[7]; Joos, Fortunat ^[8];

^[9]; Ito, Akihito ^[10]; Kleinen, Thomas ^[6]; Koven, Charles D. ^[11]; McDonald, Kyle ^[12]; Melton, Joe R. ^[4]; Peng, Changhui ^[13]; Peng, Shushi ^[2]; Prigent, Catherine ^[14] more »

NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Montana State Univ., Bozeman, MT (United States)
Lab. des Sciences du Climat et de l'Environment, Gif-sur-Yvette (France)
CSIRO Marine and Atmospheric Research Oceans and Atmosphere, Canberra, ACT (Australia)
Climate Research Division Environment Canada, Victoria, BC (Canada)
Univ. of Sheffield, Sheffield (United Kingdom)
Max Planck Institute for Meteorology, Hamburg (Germany)
Met Office Hadley Centre, Exeter (United Kingdom)
Univ. of Bern (Switzerland)
Met Office Hadley Centre, Wallingford (United Kingdom)
National Institute for Environmental Studies, Tsukuba (Japan)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
City Univ. of New York, New York, NY (United States)
Univ. of Quebec at Montreal, Montreal, QC (Canada)
Observatoire de Paris, Paris (France)
Univ. of New Hampshire, Durham, NH (United States)
Auburn Univ., Auburn, AL (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Montana State Univ., Bozeman, MT (United States); Swiss Federal Research Institute WSL, Birmensdorf (Switzerland)
Northwest A&F Univ., Yangling (People's Republic of China)

Increasing atmospheric methane (CH₄) concentrations have contributed to approximately 20% of anthropogenic climate change. Despite the importance of CH₄ as a greenhouse gas, its atmospheric growth rate and dynamics over the past two decades, which include a stabilization period (1999–2006), followed by renewed growth starting in 2007, remain poorly understood. We provide an updated estimate of CH₄ emissions from wetlands, the largest natural global CH₄ source, for 2000–2012 using an ensemble of biogeochemical models constrained with remote sensing surface inundation and inventory-based wetland area data. Between 2000–2012, boreal wetland CH₄ emissions increased by 1.2 Tg yr^–1 (–0.2–3.5 Tg yr^–1), tropical emissions decreased by 0.9 Tg yr^–1 (–3.2–1.1 Tg yr^–1), yet globally, emissions remained unchanged at 184 ± 22 Tg yr^–1. Changing air temperature was responsible for increasing high-latitude emissions whereas declines in low-latitude wetland area decreased tropical emissions; both dynamics are consistent with features of predicted centennial-scale climate change impacts on wetland CH₄ emissions. Despite uncertainties in wetland area mapping, our study shows that global wetland CH₄ emissions have not contributed significantly to the period of renewed atmospheric CH₄ growth, and is consistent with findings from studies that indicate some combination of increasing fossil fuel and agriculture-related CH₄ emissions, and a decrease in the atmospheric oxidative sink.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1408475

Journal Information:: Environmental Research Letters, Vol. 12, Issue 9; ISSN 1748-9326

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 111 works

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References (112)

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