Long-term intercomparison of two pCO2 instruments based on ship-of-opportunity measurements in a dynamic shelf sea environment.
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Macovei, Vlad A.
Voynova, Yoana G.
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The partial pressure of carbon dioxide (pCO2) in surface seawater is an important biogeochemical variable because, together with the pCO2 in the atmosphere, it determines the direction of air–sea carbon dioxide exchange. Large-scale observations of pCO2 are facilitated by Ships-of-Opportunity (SOOP-CO2) equipped with underway measuring instruments. The need for expanding the observation capacity and the challenges involving the sustainability and maintenance of traditional equilibrator systems led the community toward developing simpler and more autonomous systems. Here we performed a comparison between a membrane-based sensor and a showerhead equilibration sensor installed on two SOOP-CO2 between 2013 and 2018. We identified time- and space-adequate crossovers in the Skagerrak Strait, where the two ship routes often crossed. We found a mean total difference of 1.5 ± 10.6 μatm and a root mean square error of 11 μatm. The pCO2 values recorded by the two instruments showed a str.....
JournalLimnology and Oceanography: Methods
Page Rangepp. 37–50
Sustainable Development Goals (SDG)14.a
Essential Ocean Variables (EOV)N/A
Spatial CoverageSkagerrak Strait
CitationMacovei, V.A., Voynova, Y.G., Becker, M., Triest, J. and Petersen, W. (2021) Long-term intercomparison of two pCO2 instruments based on ship-of-opportunity measurements in a dynamic shelf sea environment. Limnology and Oceanography: Methods, 19, pp.37-50. DOI: https://doi.org/10.1002/lom3.10403
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