Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions
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 I.; 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; Schäfer, Karina V. R.; Schmid, Hans Peter; Shurpali, Narasinha; Sonnentag, Oliver; Tang, Angela C. I.; Torn, Margaret S.; Trotta, Carlo; Tuittila, Eeva-Stiina; Ueyama, Masahito; Vargas, Rodrigo; Vesala, Timo; Windham-Myers, Lisamarie; Zhang, Zhen; Zona, Donatella (2021)
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 I.
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
Schäfer, Karina V. R.
Schmid, Hans Peter
Shurpali, Narasinha
Sonnentag, Oliver
Tang, Angela C. I.
Torn, Margaret S.
Trotta, Carlo
Tuittila, Eeva-Stiina
Ueyama, Masahito
Vargas, Rodrigo
Vesala, Timo
Windham-Myers, Lisamarie
Zhang, Zhen
Zona, Donatella
Julkaisusarja
Nature communications
Volyymi
12
Numero
1
Sivut
10 p.
Springer Nature
2021
Julkaisun pysyvä osoite on
http://urn.fi/URN:NBN:fi-fe2021121360240
http://urn.fi/URN:NBN:fi-fe2021121360240
Tiivistelmä
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.
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