Regional and seasonal partitioning of water and temperature controls on global land carbon uptake variability

Wang, Kai; Bastos, Ana; Ciais, Philippe; Wang, Xuhui; Rödenbeck, Christian; Gentine, Pierre; Chevallier, Frédéric; Humphrey, Vincent W.; Huntingford, Chris ORCID: https://orcid.org/0000-0002-5941-7770; O’Sullivan, Michael; Seneviratne, Sonia I.; Sitch, Stephen; Piao, Shilong. 2022 Regional and seasonal partitioning of water and temperature controls on global land carbon uptake variability. Nature Communications, 13, 3469. 10.1038/s41467-022-31175-w

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Abstract/Summary

Global fluctuations in annual land carbon uptake (NEEIAV) depend on water and temperature variability, yet debate remains about local and seasonal controls of the global dependences. Here, we quantify regional and seasonal contributions to the correlations of globally-averaged NEEIAV against terrestrial water storage (TWS) and temperature, and respective uncertainties, using three approaches: atmospheric inversions, process-based vegetation models, and data-driven models. The three approaches agree that the tropics contribute over 63% of the global correlations, but differ on the dominant driver of the global NEEIAV, because they disagree on seasonal temperature effects in the Northern Hemisphere (NH, >25°N). In the NH, inversions and process-based models show inter-seasonal compensation of temperature effects, inducing a global TWS dominance supported by observations. Data-driven models show weaker seasonal compensation, thereby estimating a global temperature dominance. We provide a roadmap to fully understand drivers of global NEEIAV and discuss their implications for future carbon–climate feedbacks.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1038/s41467-022-31175-w
UKCEH and CEH Sections/Science Areas:	Hydro-climate Risks (Science Area 2017-)
ISSN:	2041-1723
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	carbon cycle
NORA Subject Terms:	Earth Sciences Ecology and Environment
Date made live:	24 Jun 2022 16:56 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532802

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