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  3. Global wetland contribution to 2000–2012 atmospheric methane growth rate dynamics
 

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

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BORIS DOI
10.7892/boris.106533
Date of Publication
2017
Publication Type
Article
Division/Institute

Physikalisches Instit...

Author
Poulter, Benjamin
Bousquet, Philippe
Canadell, Josep G
Ciais, Philippe
Peregon, Anna
Saunois, Marielle
Arora, Vivek K
Beerling, David J
Brovkin, Victor
Jones, Chris D
Joos, Fortunatorcid-logo
Physikalisches Institut, Klima- und Umweltphysik (KUP)
Gedney, Nicola
Ito, Akihito
Kleinen, Thomas
Koven, Charles D
McDonald, Kyle
Melton, Joe R
Peng, Changhui
Peng, Shushi
Prigent, Catherine
Schroeder, Ronny
Riley, William J
Saito, Makoto
Spahni, Renato
Physikalisches Institut, Klima- und Umweltphysik (KUP)
Tian, Hanqin
Taylor, Lyla
Viovy, Nicolas
Wilton, David
Wiltshire, Andy
Xu, Xiyan
Zhang, Bowen
Zhang, Zhen
Zhu, Qiuan
Subject(s)

500 - Science::530 - ...

Series
Environmental Research Letters
ISSN or ISBN (if monograph)
1748-9326
Publisher
IOP Publishing
Language
English
Publisher DOI
10.1088/1748-9326/aa8391
Description
Increasing atmospheric methane (CH₄) concentrations have contributed to approximately 20% of anthropogenic climate change. Despite the importance of CH₄ 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 CH₄ emissions from wetlands, the largest natural global CH₄ 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 CH4 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 CH₄ emissions. Despite uncertainties in wetland area mapping, our study shows that global wetland CH₄ emissions have not contributed significantly to the period of renewed atmospheric CH₄ growth, and is consistent with findings from studies that indicate some combination of increasing fossil fuel and agriculture-related CH₄ emissions, and a decrease in the atmospheric oxidative sink.
Handle
https://boris-portal.unibe.ch/handle/20.500.12422/155293
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poulter17erl.pdftextAdobe PDF2.54 MBAttribution (CC BY 4.0)publishedOpen
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