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

Type Article
Date 2022-04
Language English
Author(s) Wu Yingxu1, 2, Bakker Dorothee C. E.3, Achterberg Eric P.4, Silva Amavi N.1, Pickup Daisy D.1, 3, Li Xiang5, Hartman Sue6, Stappard David1, Qi DiORCID2, Tyrrell Toby1
Affiliation(s) 1 : Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, UK
2 : Polar and Marine Research Institute, Jimei University, Xiamen, China
3 : Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK
4 : GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
5 : Department of Physics, George Washington University, Washington, DC, USA
6 : National Oceanography Centre, Southampton, UK
Source Communications Earth & Environment (2662-4435) (Springernature), 2022-04 , Vol. 3 , N. 1 , P. 92 (11p.)
DOI 10.1038/s43247-022-00421-w
WOS© Times Cited 10
Abstract

The distributions of dissolved O-2 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 O-2 concentrations relative to saturation exhibit large seasonal and geographic variations. However, linear fits of CO2 and O-2 deviations from saturation (Delta CO2 against Delta O-2) 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 Delta CO2-Delta O-2 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. Comparison of carbon dioxide and oxygen concentrations in ocean surface waters relative to saturation can be used to identify erroneous data collected by autonomous ocean platforms, suggests an analysis of data from multiple global datasets

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How to cite 

Wu Yingxu, Bakker Dorothee C. E., Achterberg Eric P., Silva Amavi N., Pickup Daisy D., Li Xiang, Hartman Sue, Stappard David, Qi Di, Tyrrell Toby (2022). Integrated analysis of carbon dioxide and oxygen concentrations as a quality control of ocean float data. Communications Earth & Environment, 3(1), 92 (11p.). Publisher's official version : https://doi.org/10.1038/s43247-022-00421-w , Open Access version : https://archimer.ifremer.fr/doc/00775/88661/