Article

 

Enhanced methane emissions from tropical wetlands during the 2011 La Niña. 公开 Deposited

https://scholar.colorado.edu/concern/articles/kd17ct54n
Abstract
  • Year-to-year variations in the atmospheric methane (CH4) growth rate show significant correlation with climatic drivers. The second half of 2010 and the first half of 2011 experienced the strongest La Niña since the early 1980s, when global surface networks started monitoring atmospheric CH4 mole fractions. We use these surface measurements, retrievals of column-averaged CH4 mole fractions from GOSAT, new wetland inundation estimates, and atmospheric δ13C-CH4 measurements to estimate the impact of this strong La Niña on the global atmospheric CH4 budget. By performing atmospheric inversions, we find evidence of an increase in tropical CH4 emissions of ∼6-9 TgCH4 yr-1 during this event. Stable isotope data suggest that biogenic sources are the cause of this emission increase. We find a simultaneous expansion of wetland area, driven by the excess precipitation over the Tropical continents during the La Niña. Two process-based wetland models predict increases in wetland area consistent with observationally-constrained values, but substantially smaller per-area CH4 emissions, highlighting the need for improvements in such models. Overall, tropical wetland emissions during the strong La Niña were at least by 5% larger than the long-term mean.

Creator
Date Issued
  • 2017-04-10
Academic Affiliation
Journal Title
Journal Volume
  • 7
File Extent
  • 45759-45759
最新修改
  • 2020-01-30
Identifier
  • PubMed ID: 28393869
Resource Type
权利声明
DOI
ISSN
  • 2045-2322
Language
License

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