Improved global wetland carbon isotopic signatures support post-2006 microbial methane emission increase - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Communications Earth & Environment Year : 2022

Improved global wetland carbon isotopic signatures support post-2006 microbial methane emission increase

Youmi Oh
  • Function : Author
Qianlai Zhuang
  • Function : Author
Lisa R. Welp
  • Function : Author
Licheng Liu
  • Function : Author
Xin Lan
  • Function : Author
Sourish Basu
  • Function : Author
Edward J. Dlugokencky
  • Function : Author
Lori Bruhwiler
  • Function : Author
John B. Miller
  • Function : Author
Sylvia E. Michel
  • Function : Author
Stefan Schwietzke
  • Function : Author
Pieter Tans
  • Function : Author
Jeffrey P. Chanton
  • Function : Author

Abstract

Atmospheric concentrations of methane, a powerful greenhouse gas, have strongly increased since 2007. Measurements of stable carbon isotopes of methane can constrain emissions if the isotopic compositions are known; however, isotopic compositions of methane emissions from wetlands are poorly constrained despite their importance. Here, we use a process-based biogeochemistry model to calculate the stable carbon isotopic composition of global wetland methane emissions. We estimate a mean global signature of −61.3 ± 0.7‰ and find that tropical wetland emissions are enriched by ~11‰ relative to boreal wetlands. Our model shows improved resolution of regional, latitudinal and global variations in isotopic composition of wetland emissions. Atmospheric simulation scenarios with the improved wetland isotopic composition suggest that increases in atmospheric methane since 2007 are attributable to rising microbial emissions. Our findings substantially reduce uncertainty in the stable carbon isotopic composition of methane emissions from wetlands and improve understanding of the global methane budget.
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insu-03824347 , version 1 (21-10-2022)

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Youmi Oh, Qianlai Zhuang, Lisa R. Welp, Licheng Liu, Xin Lan, et al.. Improved global wetland carbon isotopic signatures support post-2006 microbial methane emission increase. Communications Earth & Environment, 2022, 3, ⟨10.1038/s43247-022-00488-5⟩. ⟨insu-03824347⟩
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