Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions

Kuang-Yu Chang; William J. Riley; Sara H. Knox; Robert B. Jackson; Gavin McNicol; Benjamin Poulter; Mika Aurela; Dennis Baldocchi; Sheel Bansal; Gil Bohrer; David I. Campbell; Alessandro Cescatti; Housen Chu; Kyle B. Delwiche; Ankur R. Desai; Eugenie S. Euskirchen; Matthias Goeckede; Thomas Friborg; Kyle S. Hemes; Takashi Hirano; Hiroki Iwata; Manuel Helbig; Trevor F. Keenan; Minseok Kang; Ken Krauss; Annalea Lohila; Bhaskar Mitra; Ivan Mammarella; Akira Miyata; Mats B. Nilsson; Walter C. Oechel; Akso Noormets; Matthias Peichl; Michele L. Reba; Janne Rinne; Dario Papale; Benjamin R. K. Runkle; Youngryel Ryu; Torsten Sachs; Karina VR Schafer; Hans Peter Schmid; Narasinha Shurpali; Oliver Sonnentag; Angela Tang; Margaret S. Torn; Eeva-Stiina Tuittila; Carlo Trotta; Masahito Ueyama; Rodrigo Vargas; Timo Vesala; Lisamarie Windham-Myers; Zhen Zhang; Donatella Zona

doi:10.1038/s41467-021-22452-1

Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions

Nature Communications

By: Kuang-Yu Chang, William J. Riley, Sara H. Knox, Robert B. Jackson, Gavin McNicol, Benjamin Poulter, Mika Aurela, Dennis Baldocchi, Sheel Bansal, Gil Bohrer, David I. Campbell, Alessandro Cescatti, Housen Chu, Kyle B. Delwiche, Ankur R. Desai, Eugenie S. Euskirchen, Matthias Goeckede, Thomas Friborg, Kyle S. Hemes, Takashi Hirano, Hiroki Iwata, Manuel Helbig, Trevor F. Keenan, Minseok Kang, Ken Krauss, Annalea Lohila, Bhaskar Mitra, Ivan Mammarella, Akira Miyata, Mats B. Nilsson, Walter C. Oechel, Akso Noormets, Matthias Peichl, Michele L. Reba, Janne Rinne, Dario Papale, Benjamin R. K. Runkle, Youngryel Ryu, Torsten Sachs, Karina VR Schafer, Hans Peter Schmid, Narasinha Shurpali, Oliver Sonnentag, Angela Tang, Margaret S. Torn, Eeva-Stiina Tuittila, Carlo Trotta, Masahito Ueyama, Rodrigo Vargas, Timo Vesala, Lisamarie Windham-Myers, Zhen Zhang, and Donatella Zona

https://doi.org/10.1038/s41467-021-22452-1

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Abstract

Wetland methane (CH₄) emissions ( $FCH 4$ ) are important in global carbon budgets and climate change assessments. Currently, $FCH 4$ projections rely on prescribed static temperature sensitivity that varies among biogeochemical models. Meta-analyses have proposed a consistent $FCH 4$ temperature dependence across spatial scales for use in models; however, site-level studies demonstrate that $FCH 4$ are often controlled by factors beyond temperature. Here, we evaluate the relationship between $FCH 4$ and temperature using observations from the FLUXNET-CH₄ database. Measurements collected across the globe show substantial seasonal hysteresis between $FCH 4$ and temperature, suggesting larger $FCH 4$ 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.

Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions
Series title	Nature Communications
DOI	10.1038/s41467-021-22452-1
Volume	12
Publication Date	April 15, 2021
Year Published	2021
Language	English
Publisher	Springer
Contributing office(s)	Northern Prairie Wildlife Research Center
Description	2266, 10 p.