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Conference Paper

Physical drivers of the recent Southern Ocean carbon uptake in an eddying ocean

Authors

Patara,  Lavinia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rieck,  Jan Klaus
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ödalen,  Malin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tanhua,  Toste
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Oschlies,  Andreas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hauck,  Judith
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Patara, L., Rieck, J. K., Ödalen, M., Tanhua, T., Oschlies, A., Hauck, J. (2023): Physical drivers of the recent Southern Ocean carbon uptake in an eddying ocean, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3196


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020502
Abstract
Owing to its cool temperatures and vigorous water mass formation, the strongly eddying Southern Ocean is a key region of ocean CO2 uptake. In this study we assess the role of 1) wind stress and buoyancy forcing and 2) the representation of mesoscale eddies, in affecting the mean and temporal variations of the Southern Ocean carbon uptake in the past 60 years. We analyze global ocean biogeochemistry simulations based on the NEMO-MOPS and FESOM-REcoM models and ranging from 1° and 0.5° resolutions (where eddies are parameterized) to eddy-rich 0.25° and 0.1° resolutions. The 0.25° model is also used to perform sensitivity experiments to unravel the relative role of wind stress and of buoyancy forcing for the carbon uptake variations. We find that eddy-rich models have steeper isopycnals across the Antarctic Circumpolar Current, which results in higher anthropogenic carbon uptake and storage than in models where eddies are parameterized. This, in combination with a somewhat lower outgassing of natural CO2, gives rise to a steeper trend of the Southern Ocean carbon uptake in the eddy-rich than in the eddy-parameterized models. Wind stress and buoyancy forcing are the main drivers of an increased outgassing of natural CO2 over the past decades and drive most of its interannual and decadal variability, with wind stress dominating at subpolar latitudes, and buoyancy forcing in water mass formation regions. However, our experiments indicate that the stalling of the Southern Ocean carbon uptake in the 1990s was mostly driven by a reduction of its anthropogenic carbon uptake.