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Title: Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions
Authors: 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.
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.
Schäfer, K. V. R.
Schmid, H. P.
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.
Issue Date: 2021
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
temperature dependence across spatial scales for use in models; however, sitelevel
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.
ISSN: 2041-1723
DOI: 10.1038/s41467-021-22452-1
Rights: Attribution 3.0 United States
Appears in Collections:A1. Articolo in rivista

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