Wintertime fCO2 variability in the subpolar North Atlantic since 2004

Fröb, Friederike; Olsen, A.; Becker, M.; Chafik, L.; Johannessen, T.; Reverdin, G.; Omar, A.

doi:10.1029/2018GL080554

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Wintertime fCO2 variability in the subpolar North Atlantic since 2004

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Fröb, Friederike
Ocean Biogeochemistry, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;
Geophysical Institute and Bjerknes Centre for Climate Research, University of Bergen;

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Citation

Fröb, F., Olsen, A., Becker, M., Chafik, L., Johannessen, T., Reverdin, G., et al. (2019). Wintertime fCO2 variability in the subpolar North Atlantic since 2004. Geophysical Research Letters, 46, 1580-1590. doi:10.1029/2018GL080554.

Cite as: https://hdl.handle.net/21.11116/0000-0003-1614-E

Abstract

Winter data of surface ocean temperature (SST), salinity (SSS) and CO 2 fugacity (fCO 2 ) 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 fCO 2 increased at a rate similar to the atmospheric CO 2 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 CO 2 alone. This is attributed to the cooling. In the Irminger Sea, fCO 2 exhibited additional interannual variations driven by atmospheric forcing through winter mixing. As winter fCO 2 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. ©2019. American Geophysical Union. All Rights Reserved.