CAMPBELL, J. E.; BERRY, J. A.; SEIBT, U.; SMITH, S. J.; MONTZKA, S. A.; LAUNOIS, Thomas; BELVISO, Sauveur; BOPP, Laurent; LAINE, M.

doi:10.1038/nature22030

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CAMPBELL, J. E.
Sierra Nevada Research Institute

BERRY, J. A.
Department of Global Ecology

SEIBT, U.
Department of Atmospheric and Oceanic Sciences [Los Angeles] [AOS]

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Article de revue

Ce document a été publié dans

Nature. 2017, vol. 544, n° 7648, p. 84-87

Nature Publishing Group

Résumé en anglais

Growth in terrestrial gross primary production (GPP)-the amount of carbon dioxide that is 'fixed' into organic material through the photosynthesis of land plants-may provide a negative feedback for climate change. It remains uncertain, however, to what extent biogeochemical processes can suppress global GPP growth. As a consequence, modelling estimates of terrestrial carbon storage, and of feedbacks between the carbon cycle and climate, remain poorly constrained. Here we present a global, measurement-based estimate of GPP growth during the twentieth century that is based on long-term atmospheric carbonyl sulfide (COS) records, derived from ice-core, firn and ambient air samples. We interpret these records using a model that simulates changes in COS concentration according to changes in its sources and sinks-including a large sink that is related to GPP. We find that the observation-based COS record is most consistent with simulations of climate and the carbon cycle that assume large GPP growth during the twentieth century (31% ± 5% growth; mean ± 95% confidence interval). Although this COS analysis does not directly constrain models of future GPP growth, it does provide a global-scale benchmark for historical carbon-cycle simulations.< Réduire

Mots clés

photosynthèse foliaire

teneur en dioxyde de carbone

production primaire brute

URI

https://oskar-bordeaux.fr/handle/20.500.12278/196587

DOI

http://dx.doi.org/10.1038/nature22030

Projet Européen

Coordinated Research in Earth Systems and Climate: Experiments, kNowledge, Dissemination and Outreach
Carbonic anhydrase: where the CO2, COS and H2O cycles meet

Origine

Importé de hal

Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391