Constraining the trend in the ocean CO2 sink during 2000–2022

Mayot, Nicolas ORCID: https://orcid.org/0000-0003-4255-5939, Buitenhuis, Erik T. ORCID: https://orcid.org/0000-0001-6274-5583, Wright, Rebecca M. ORCID: https://orcid.org/0000-0003-2333-6247, Hauck, Judith, Bakker, Dorothee C. E. ORCID: https://orcid.org/0000-0001-9234-5337 and Le Quéré, Corinne ORCID: https://orcid.org/0000-0003-2319-0452 (2024) Constraining the trend in the ocean CO2 sink during 2000–2022. Nature Communications, 15. ISSN 2041-1723

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Abstract

The ocean will ultimately store most of the CO2 emitted to the atmosphere by human activities. Despite its importance, estimates of the 2000−2022 trend in the ocean CO2 sink differ by a factor of two between observation-based products and process-based models. Here we address this discrepancy using a hybrid approach that preserves the consistency of known processes but constrains the outcome using observations. We show that the hybrid approach reproduces the stagnation of the ocean CO2 sink in the 1990s and its reinvigoration in the 2000s suggested by observation-based products and matches their amplitude. It suggests that process-based models underestimate the amplitude of the decadal variability in the ocean CO2 sink, but that observation-based products on average overestimate the decadal trend in the 2010s. The hybrid approach constrains the 2000−2022 trend in the ocean CO2 sink to 0.42 ± 0.06 Pg C yr−1 decade−1, and by inference the total land CO2 sink to 0.28 ± 0.13 Pg C yr−1 decade−1.

Item Type: Article
Additional Information: Data available here: https://osf.io/2kzps/?view_only=6ad809f1887342a0a19907e40a33e7cf
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: University of East Anglia Schools > Faculty of Science > Tyndall Centre for Climate Change Research
Faculty of Science > Research Centres > Tyndall Centre for Climate Change Research
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Depositing User: LivePure Connector
Date Deposited: 01 Oct 2024 09:30
Last Modified: 01 Oct 2024 09:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/96849
DOI: 10.1038/s41467-024-52641-7

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