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Upper Deep Water: Where the ocean does not overturn

Authors

De Lavergne,  Casimir
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sallée,  Jean-Baptiste
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

Evans,  D. Gwyn
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Naveira Garabato,  Alberto
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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Citation

De Lavergne, C., Sallée, J.-B., Madec, G., Evans, D. G., Naveira Garabato, A., Zika, J., Klocker, A. (2023): Upper Deep Water: Where the ocean does not overturn, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1256


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017375
Abstract
The ocean's global overturning circulation is a network of currents that redistributes vast amounts of heat, carbon and nutrients across the planet. It is traditionally conceptualized as a conveyor belt that carries and joins all major water masses of the global deep ocean. Here we show that a voluminous mid-depth layer, termed Upper Deep Water, is excluded from the global conveyor belt. This exclusion results from topographic constraints on abyssal overturning, dynamical constraints on upwelling in the Antarctic Circumpolar Current, and ocean-sea ice interactions around Antarctica. The findings establish a revised schematic of the global overturning circulation and a dominant role of diffusive processes in the ventilation of Upper Deep Water.