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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.
Campbell, D. I.
Delwiche, K. B.
Desai, A. R.
Hemes, K. S.
Krauss, K. W.
Nilsson, M. B.
Oechel, W. C.
Reba, M. L.
Runkle, B. R. K.
Schäfer, K. V. R.
Schmid, H. P.
Tang, A. C. I.
Torn, M. S.
|Journal:||NATURE COMMUNICATIONS||Issue Date:||2021||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
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
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
|URI:||http://hdl.handle.net/2067/43340||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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