Substantial hysteresis in emergent temperature sensitivity of global wetland CH$_{4}$ emissions
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. I.; Cescatti, A.; Chu, H.; Delwiche, K. B.; Desai, A. R.; Euskirchen, E.; Friborg, T.; Goeckede, M.; Helbig, M.; ... mehrHemes, 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.; Schäfer, K. V. R.; Schmid, H. P. 1; Shurpali, N.; Sonnentag, O.; Tang, A. C. I.; Torn, M. S.; Trotta, C.; Tuittila, E.-S.; Ueyama, M.; Vargas, R.; Vesala, T.; Windham-Myers, L.; Zhang, Z.; Zona, D.
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)
Abstract:
Wetland methane (CH$_{4}$) emissions (F$_{CH_{4}}$) are important in global carbon budgets and climate change assessments. Currently, F$_{CH_{4}}$ projections rely on prescribed static temperature sensitivity that varies among biogeochemical models. Meta-analyses have proposed a consistent F$_{CH_{4}}$ temperature dependence across spatial scales for use in models; however, site-level studies demonstrate that F$_{CH_{4}}$ are often controlled by factors beyond temperature. Here, we evaluate the relationship between F$_{CH_{4}}$ and temperature using observations from the FLUXNET-CH$_{4}$ database. Measurements collected across the globe show substantial seasonal hysteresis between F$_{CH_{4}}$ and temperature, suggesting larger F$_{CH_{4}}$ 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 CH$_{4}$ production are thus needed to improve global CH$_{4}$ budget assessments.
Zugehörige Institution(en) am KIT |
Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU) |
Publikationstyp |
Zeitschriftenaufsatz |
Publikationsjahr |
2021 |
Sprache |
Englisch |
Identifikator |
ISSN: 2041-1723
KITopen-ID: 1000132349 |
HGF-Programm |
12.11.31 (POF IV, LK 01) New observational systems and cross platform integration |
Erschienen in |
Nature communications |
Verlag |
Nature Research |
Band |
12 |
Heft |
1 |
Seiten |
Art.-Nr.: 2266 |
Nachgewiesen in |
Dimensions Scopus Web of Science
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