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Title: Rising methane emissions from northern wetlands associated with sea ice decline

The Arctic is rapidly transitioning toward a seasonal sea ice-free state, perhaps one of the most apparent examples of climate change in the world. This dramatic change has numerous consequences, including a large increase in air temperatures, which in turn may affect terrestrial methane emissions. Nonetheless, terrestrial and marine environments are seldom jointly analyzed. By comparing satellite observations of Arctic sea ice concentrations to methane emissions simulated by three process-based biogeochemical models, this study shows that rising wetland methane emissions are associated with sea ice retreat. Our analyses indicate that simulated high-latitude emissions for 2005-2010 were, on average, 1.7 Tg CH4 yr(-1) higher compared to 1981-1990 due to a sea ice-induced, autumn-focused, warming. Since these results suggest a continued rise in methane emissions with future sea ice decline, observation programs need to include measurements during the autumn to further investigate the impact of this spatial connection on terrestrial methane emissions.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [3] ;  [1] ;  [5]
  1. Lund Univ. (Sweden)
  2. Vrije Univ., Amsterdam (Netherlands)
  3. Purdue Univ., West Lafayette, IN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Alaska, Fairbanks, AK (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; SC0007007
Type:
Published Article
Journal Name:
Geophysical Research Letters (Online)
Additional Journal Information:
Journal Name: Geophysical Research Letters (Online); Journal Volume: 42; Journal Issue: 17; Journal ID: ISSN 1944-8007
Publisher:
American Geophysical Union (AGU)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1222499
Alternate Identifier(s):
OSTI ID: 1240459; OSTI ID: 1335325