Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions

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Chang , K-Y , Riley , W J , Knox , S H , Jackson , R B , McNicol , G , Poulter , B , Aurela , M , Baldocchi , D , Bansal , S , Bohrer , G , Campbell , D , Cescatti , A , Chu , H , Delwiche , K B , Desai , A R , Euskirchen , E , Friborg , T , Goeckede , M , Helbig , M , Hemes , K S , Hirano , T , Iwata , H , Kang , M , Keenan , T , Krauss , K W , Lohila , A , Mammarella , I , Mitra , B , Miyata , A , Nilsson , M B , Noormets , A , Oechel , W C , Papale , D , Peichl , M , Reba , M L , Rinne , J , Runkle , B R K , Ryu , Y , Sachs , T , Schaefer , K V R , Schmid , H P , Shurpali , N , Sonnentag , O , Tang , A C , Torn , M S , Trotta , C , Tuittila , E-S , Ueyama , M , Vargas , R , Vesala , T , Windham-Myers , L , Zhang , Z & Zona , D 2021 , ' Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions ' , Nature Communications , vol. 12 , 2266 .

Title: Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions
Author: Chang, Kuang-Yu; Riley, William J.; Knox, Sara H.; Jackson, Robert B.; McNicol, Gavin; Poulter, Benjamin; Aurela, Mika; Baldocchi, Dennis; Bansal, Sheel; Bohrer, Gil; Campbell, David; Cescatti, Alessandro; Chu, Housen; Delwiche, Kyle B.; Desai, Ankur R.; Euskirchen, Eugenie; Friborg, Thomas; Goeckede, Mathias; Helbig, Manuel; Hemes, Kyle S.; Hirano, Takashi; Iwata, Hiroki; Kang, Minseok; Keenan, Trevor; Krauss, Ken W.; Lohila, Annalea; Mammarella, Ivan; Mitra, Bhaskar; Miyata, Akira; Nilsson, Mats B.; Noormets, Asko; Oechel, Walter C.; Papale, Dario; Peichl, Matthias; Reba, Michele L.; Rinne, Janne; Runkle, Benjamin R. K.; Ryu, Youngryel; Sachs, Torsten; Schaefer, Karina V. R.; Schmid, Hans Peter; Shurpali, Narasinha; Sonnentag, Oliver; Tang, Angela C.; Torn, Margaret S.; Trotta, Carlo; Tuittila, Eeva-Stiina; Ueyama, Masahito; Vargas, Rodrigo; Vesala, Timo; Windham-Myers, Lisamarie; Zhang, Zhen; Zona, Donatella
Contributor organization: Institute for Atmospheric and Earth System Research (INAR)
Micrometeorology and biogeochemical cycles
Department of Geosciences and Geography
Viikki Plant Science Centre (ViPS)
Ecosystem processes (INAR Forest Sciences)
Date: 2021-04-15
Language: eng
Number of pages: 10
Belongs to series: Nature Communications
ISSN: 2041-1723
Abstract: Wetland methane (CH4) emissions (FCH4) are important in global carbon budgets and climate change assessments. Currently, FCH4 projections rely on prescribed static temperature sensitivity that varies among biogeochemical models. Meta-analyses have proposed a consistent FCH4 temperature dependence across spatial scales for use in models; however, site-level studies demonstrate that FCH4 are often controlled by factors beyond temperature. Here, we evaluate the relationship between FCH4 and temperature using observations from the FLUXNET-CH4 database. Measurements collected across the globe show substantial seasonal hysteresis between FCH4 and temperature, suggesting larger FCH4 sensitivity to temperature later in the frost-free season (about 77% of site-years). Results derived from a machine-learning model and several regression models highlight the importance of representing the large spatial and temporal variability within site-years and ecosystem types. Mechanistic advancements in biogeochemical model parameterization and detailed measurements in factors modulating CH4 production are thus needed to improve global CH4 budget assessments. Wetland methane emissions contribute to global warming, and are oversimplified in climate models. Here the authors use eddy covariance measurements from 48 global sites to demonstrate seasonal hysteresis in methane-temperature relationships and suggest the importance of microbial processes.
1171 Geosciences
1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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