Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions.
Nat Commun
; 12(1): 2266, 2021 04 15.
Article
en En
| MEDLINE
| ID: mdl-33859182
ABSTRACT
Wetland methane (CH4) emissions ([Formula see text]) are important in global carbon budgets and climate change assessments. Currently, [Formula see text] projections rely on prescribed static temperature sensitivity that varies among biogeochemical models. Meta-analyses have proposed a consistent [Formula see text] temperature dependence across spatial scales for use in models; however, site-level studies demonstrate that [Formula see text] are often controlled by factors beyond temperature. Here, we evaluate the relationship between [Formula see text] and temperature using observations from the FLUXNET-CH4 database. Measurements collected across the globe show substantial seasonal hysteresis between [Formula see text] and temperature, suggesting larger [Formula see text] 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.
Texto completo:
1
Base de datos:
MEDLINE
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Idioma:
En
Revista:
Nat Commun
Asunto de la revista:
BIOLOGIA
/
CIENCIA
Año:
2021
Tipo del documento:
Article
País de afiliación:
Estados Unidos