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

Increasing atmospheric methane (CH 4) concentrations have contributed to approximately 20% of anthropogenic climate change. Despite the importance of CH 4 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 CH 4 emissions from wetlands, the largest natural global CH 4 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 CH 4 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 CH 4 emissions. Despite uncertainties in wetland area mapping, our study shows that global wetland CH 4 emissions have not contributed significantly to the period of renewed atmospheric CH 4 growth, and is consistent with findings from studiesmore » that indicate some combination of increasing fossil fuel and agriculture-related CH 4 emissions, and a decrease in the atmospheric oxidative sink.« less
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [2] ;  [2] ;  [2] ;  [4] ;  [5] ; ORCiD logo [6] ;  [7] ;  [8] ; ORCiD logo [9] ;  [10] ;  [6] ;  [11] ;  [12] ;  [4] ;  [13] ;  [2] ;  [14] more »;  [15] ;  [11] ;  [10] ;  [8] ;  [16] ;  [5] ;  [2] ;  [5] ;  [7] ;  [17] ;  [16] ; ORCiD logo [18] ;  [19] « less
  1. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Montana State Univ., Bozeman, MT (United States)
  2. Lab. des Sciences du Climat et de l'Environment, Gif-sur-Yvette (France)
  3. CSIRO Marine and Atmospheric Research Oceans and Atmosphere, Canberra, ACT (Australia)
  4. Climate Research Division Environment Canada, Victoria, BC (Canada)
  5. Univ. of Sheffield, Sheffield (United Kingdom)
  6. Max Planck Institute for Meteorology, Hamburg (Germany)
  7. Met Office Hadley Centre, Exeter (United Kingdom)
  8. Univ. of Bern (Switzerland)
  9. Met Office Hadley Centre, Wallingford (United Kingdom)
  10. National Institute for Environmental Studies, Tsukuba (Japan)
  11. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  12. City Univ. of New York, New York, NY (United States)
  13. Univ. of Quebec at Montreal, Montreal, QC (Canada)
  14. Observatoire de Paris, Paris (France)
  15. Univ. of New Hampshire, Durham, NH (United States)
  16. Auburn Univ., Auburn, AL (United States)
  17. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  18. Montana State Univ., Bozeman, MT (United States); Swiss Federal Research Institute WSL, Birmensdorf (Switzerland)
  19. Northwest A&F Univ., Yangling (People's Republic of China)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Volume: 12; Journal Issue: 9; Journal ID: ISSN 1748-9326
Publisher:
IOP Publishing
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; methanogenesis; wetlands; methane
OSTI Identifier:
1408475