Integrated analysis of carbon dioxide and oxygen concentrations as a quality control of ocean float data

Wu, Yingxu, Bakker, Dorothee C. E., Achterberg, Eric P., Silva, Amavi N., Pickup, Daisy D., Li, Xiang, Hartman, Sue, Stappard, David, Qi, Di and Tyrrell, Toby (2022) Integrated analysis of carbon dioxide and oxygen concentrations as a quality control of ocean float data. Communications Earth & Environment, 3 (1). ISSN 2662-4435

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Abstract

The distributions of dissolved O2 and CO2 have not previously been systematically compared across the global surface ocean, despite their significance for life and climate. Here we analyze carbon dioxide and oxygen concentrations relative to saturation (equilibrium with the atmosphere) in surface waters, using two large datasets (ship-collected and float-collected data). When applied to a high-quality global ship-collected dataset, CO2 and O2 concentrations relative to saturation exhibit large seasonal and geographic variations. However, linear fits of CO2 and O2 deviations from saturation (ΔCO2 against ΔO2) yield y-intercepts close to zero, which suggests a requirement for data validity. We utilize this finding to investigate the accuracy of carbonate system data from biogeochemical-Argo floats. We find significant discrepancies in ΔCO2-ΔO2 y-intercepts compared to the global reference, implying overestimations of float-based CO2 release in the Southern Ocean. We conclude that this technique can be applied to data from autonomous platforms for quality assessment.

Item Type: Article
Additional Information: This work was jointly funded by the Swire Educational Trust, National Key Research and Development Program of China (2019YFE0114800, 2019YFC1509100), National Natural Science Foundation of China (42106222), Natural Science Foundation of Fujian Province, China (2020J05075), and Key Deployment Project of Centre for Ocean Mega-Research of Science, CAS (Grant No. COMS2020Q12). We acknowledge the work by the data providers and scientists carrying out data synthesis that led to the production of the datasets used here. We thank Wei-Jun Cai at the University of Delaware for helpful and constructive discussions.
Uncontrolled Keywords: sdg 13 - climate action ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: LivePure Connector
Date Deposited: 27 Apr 2022 08:35
Last Modified: 06 May 2022 03:55
URI: https://ueaeprints.uea.ac.uk/id/eprint/84804
DOI: 10.1038/s43247-022-00421-w

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