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Title: Enhanced methane emissions from tropical wetlands during the 2011 La Niña

Abstract

Year-to-year variations in the atmospheric methane (CH 4) 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 CH 4 mole fractions. We use these surface measurements, retrievals of column-averaged CH 4 mole fractions from GOSAT, new wetland inundation estimates, and atmospheric δ 13C-CH 4 measurements to estimate the impact of this strong La Niña on the global atmospheric CH 4 budget. By performing atmospheric inversions, we find evidence of an increase in tropical CH 4 emissions of ~6–9 TgCH 4 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 CH 4 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.

Authors:
 [1];  [1];  [2];  [3];  [4];  [3];  [5];  [3];  [3];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13]
  1. Inst. for Marine and Atmospheric Research Utrecht (IMAU), Utrecht (Netherlands); SRON Netherlands Inst. for Space Research, Utrecht (Netherlands)
  2. Inst. for Marine and Atmospheric Research Utrecht (IMAU), Utrecht (Netherlands); SRON Netherlands Inst. for Space Research, Utrecht (Netherlands); Wageningen Univ. & Research (Netherlands). Dept. of Meteorology and Air Quality (MAQ)
  3. SRON Netherlands Inst. for Space Research, Utrecht (Netherlands)
  4. Lund Univ. (Sweden). Dept. of Physical Geography and Ecosystem Science
  5. NOAA Earth System Research Lab., Boulder, CO (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division; Chinese Academy of Sciences (CAS), Beijing (China). CAS Key Lab. of Regional Climate-Environment for Temperate East Asia. Inst. of Atmospheric Physics
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division
  8. Montana State Univ., Bozeman, MT (United States). Inst. on Ecosystems. Dept. of Ecology
  9. Swiss Federal Inst. for Forest, Snow and Landscape Research (WSL), Birmensdorf (Switzlerland)
  10. City College of New York, NY (United States)
  11. Inst. of Arctic and Alpine Research, Boulder, CO (United States)
  12. Lab. for Sciences of Climate and Environment (LSCE), Gif-sur-Yvette (France)
  13. Inst. for Marine and Atmospheric Research Utrecht (IMAU), Utrecht (Netherlands)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Inst. for Marine and Atmospheric Research Utrecht (IMAU), Utrecht (Netherlands); SRON Netherlands Inst. for Space Research, Utrecht (Netherlands)
Sponsoring Org.:
USDOE; Netherlands Organization for Scientific Research (NWO)
OSTI Identifier:
1476481
Grant/Contract Number:  
AC02-05CH11231; ALW-GO-AO/11-24
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; atmospheric chemistry; carbon cycle; projection and prediction

Citation Formats

Pandey, Sudhanshu, Houweling, Sander, Krol, Maarten, Aben, Ilse, Monteil, Guillaume, Nechita-Banda, Narcisa, Dlugokencky, Edward J., Detmers, Rob, Hasekamp, Otto, Xu, Xiyan, Riley, William J., Poulter, Benjamin, Zhang, Zhen, McDonald, Kyle C., White, James W. C., Bousquet, Philippe, and Röckmann, Thomas. Enhanced methane emissions from tropical wetlands during the 2011 La Niña. United States: N. p., 2017. Web. doi:10.1038/srep45759.
Pandey, Sudhanshu, Houweling, Sander, Krol, Maarten, Aben, Ilse, Monteil, Guillaume, Nechita-Banda, Narcisa, Dlugokencky, Edward J., Detmers, Rob, Hasekamp, Otto, Xu, Xiyan, Riley, William J., Poulter, Benjamin, Zhang, Zhen, McDonald, Kyle C., White, James W. C., Bousquet, Philippe, & Röckmann, Thomas. Enhanced methane emissions from tropical wetlands during the 2011 La Niña. United States. doi:10.1038/srep45759.
Pandey, Sudhanshu, Houweling, Sander, Krol, Maarten, Aben, Ilse, Monteil, Guillaume, Nechita-Banda, Narcisa, Dlugokencky, Edward J., Detmers, Rob, Hasekamp, Otto, Xu, Xiyan, Riley, William J., Poulter, Benjamin, Zhang, Zhen, McDonald, Kyle C., White, James W. C., Bousquet, Philippe, and Röckmann, Thomas. Mon . "Enhanced methane emissions from tropical wetlands during the 2011 La Niña". United States. doi:10.1038/srep45759. https://www.osti.gov/servlets/purl/1476481.
@article{osti_1476481,
title = {Enhanced methane emissions from tropical wetlands during the 2011 La Niña},
author = {Pandey, Sudhanshu and Houweling, Sander and Krol, Maarten and Aben, Ilse and Monteil, Guillaume and Nechita-Banda, Narcisa and Dlugokencky, Edward J. and Detmers, Rob and Hasekamp, Otto and Xu, Xiyan and Riley, William J. and Poulter, Benjamin and Zhang, Zhen and McDonald, Kyle C. and White, James W. C. and Bousquet, Philippe and Röckmann, Thomas},
abstractNote = {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.},
doi = {10.1038/srep45759},
journal = {Scientific Reports},
number = ,
volume = 7,
place = {United States},
year = {2017},
month = {4}
}

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