A physiology-based Earth observation model indicates stagnation in the global gross primary production during recent decades.
Earth system
GIMMS
climate change
land-atmosphere interactions
light use efficiency
photosynthesis
vegetation productivity
Journal
Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746
Informations de publication
Date de publication:
Feb 2021
Feb 2021
Historique:
received:
10
07
2020
accepted:
12
10
2020
pubmed:
31
10
2020
medline:
22
4
2021
entrez:
30
10
2020
Statut:
ppublish
Résumé
Earth observation-based estimates of global gross primary production (GPP) are essential for understanding the response of the terrestrial biosphere to climatic change and other anthropogenic forcing. In this study, we attempt an ecosystem-level physiological approach of estimating GPP using an asymptotic light response function (LRF) between GPP and incoming photosynthetically active radiation (PAR) that better represents the response observed at high spatiotemporal resolutions than the conventional light use efficiency approach. Modelled GPP is thereafter constrained with meteorological and hydrological variables. The variability in field-observed GPP, net primary productivity and solar-induced fluorescence was better or equally well captured by our LRF-based GPP when compared with six state-of-the-art Earth observation-based GPP products. Over the period 1982-2015, the LRF-based average annual global terrestrial GPP budget was 121.8 ± 3.5 Pg C, with a detrended inter-annual variability of 0.74 ± 0.13 Pg C. The strongest inter-annual variability was observed in semi-arid regions, but croplands in China and India also showed strong inter-annual variations. The trend in global terrestrial GPP during 1982-2015 was 0.27 ± 0.02 Pg C year
Identifiants
pubmed: 33124068
doi: 10.1111/gcb.15424
pmc: PMC7898396
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
836-854Subventions
Organisme : Swedish National Space Agency
ID : Dnr 95/16
Organisme : Swedish National Space Board
ID : 95
Organisme : Swedish National Space Board
ID : 16
Organisme : Danish Council for Independent Research
ID : DFF-6111-00258
Organisme : Belgian Federal Science Policy Office
ID : SR/00/339
Organisme : NASA
ID : NNX08AG87A
Pays : United States
Organisme : European Research Council
ID : 647423
Pays : International
Informations de copyright
© 2020 The Authors. Global Change Biology published by John Wiley & Sons Ltd.
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