Wintertime fCO2 variability in the subpolar North Atlantic since 2004

Winter data of surface ocean temperature (SST), salinity (SSS) and CO2 fugacity (fCO2) collected on the VOS M/V Nuka Arctica in the subpolar North Atlantic between 2004 and 2017 are used to establish trends, drivers, and interannual variability. Over the period, waters cooled and freshened, and the...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Fröb, Friederike, Olsen, Are, Becker, Meike, Chafik, Leon Martin, Johannessen, Truls, Reverdin, Gilles, Omar, Abdirahman
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Irminger Sea
North Atlantic
Online Access:https://hdl.handle.net/11250/2648938
https://doi.org/10.1029/2018GL080554
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Summary:Winter data of surface ocean temperature (SST), salinity (SSS) and CO2 fugacity (fCO2) collected on the VOS M/V Nuka Arctica in the subpolar North Atlantic between 2004 and 2017 are used to establish trends, drivers, and interannual variability. Over the period, waters cooled and freshened, and the fCO2 increased at a rate similar to the atmospheric CO2 growth rate. When accounting for the freshening, the inferred increase in dissolved inorganic carbon (DIC) was found to be approximately twice that expected from atmospheric CO2 alone. This is attributed to the cooling. In the Irminger Sea, fCO2 exhibited additional interannual variations driven by atmospheric forcing through winter mixing. As winter fCO2 in the region is close to the atmospheric, the subpolar North Atlantic has varied between being slightly supersaturated and slightly undersaturated over the investigated period. publishedVersion

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