Accuracy of ocean CO2 uptake estimates at a risk by a reduction in the data collection

Dong, Yuanxu ORCID: https://orcid.org/0000-0002-1468-1623, Bakker, Dorothee C. E. ORCID: https://orcid.org/0000-0001-9234-5337 and Landschützer, Peter (2024) Accuracy of ocean CO2 uptake estimates at a risk by a reduction in the data collection. Geophysical Research Letters, 51 (9). ISSN 0094-8276

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Abstract

Observation-based quantification of ocean carbon dioxide (CO2) uptake relies on synthesis data sets such as the Surface Ocean CO2 ATlas (SOCAT). However, the data collection effort has dramatically declined and the number of annual data sets in SOCATv2023 decreased by ∼35% from 2017 to 2021. This decline has led to a 65% increase (from 0.15 to 0.25 Pg C yr−1) in the standard deviation of seven SOCAT-based air-sea CO2 flux estimates. Reducing the availability of the annual data to that in the year 2000 creates substantial bias (50%) in the long-term flux trend. The annual mean CO2 flux is insensitive to the seasonal skew of the SOCAT data and to the addition of the lower accuracy data set available in SOCAT. Our study highlights the need for sustained data collection and synthesis, to inform the Global Carbon Budget assessment, the UN-led climate negotiations, and measurement, reporting, and verification of ocean-based CO2 removal projects.

Item Type:	Article
Additional Information:	Data Availability Statement: Synthesis and gridded SOCATv2023: https://www.socat.info/index.php/data-access/ (https://doi.org/10.25921/r7xa-bt92). Global Carbon Budget 2022: https://globalcarbonbudgetdata.org/data-archive.html. Funding information: D. C. E. Bakker acknowledges the European Union's Horizon Europe research and innovation program under Grant agreement No 101056921 (project GreenFeedBack) and funding from UK Research and Innovation (UKRI) under Grant agreement 10040851 and Natural Environment Research Council (NERC)-funded PICCOLO Grants (R204504, NE/P021395/1).
Uncontrolled Keywords:	sdg 13 - climate action ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School:	Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups:	Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Related URLs:	https://agupubs.onlinelibrary.wiley.com/...
Depositing User:	LivePure Connector
Date Deposited:	01 May 2024 08:30
Last Modified:	06 May 2024 01:29
URI:	https://ueaeprints.uea.ac.uk/id/eprint/95049
DOI:	10.1029/2024GL108502

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