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Sensitivity of simulated water mass transformation on the Antarctic shelf to tides, topography and model resolution

Urheber*innen

Boeira Dias,  Fabio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

Galton-Fenzi,  Benjamin
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;

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

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

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Zitation

Boeira Dias, F., Rintoul, S., Richter, O., Galton-Fenzi, B., Zika, J., Pellichero, V., Uotila, P. (2023): Sensitivity of simulated water mass transformation on the Antarctic shelf to tides, topography and model resolution, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2687


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019187
Zusammenfassung
Water mass transformation (WMT) around the Antarctic margin controls Antarctica Bottom Water formation and the abyssal limb of the global meridional overturning circulation, besides mediating ocean-ice shelf exchange, ice sheet stability and its contribution to sea level rise. However, the mechanisms controlling the rate of WMT in the Antarctic shelf are poorly understood due to the lack of observations and the inability of climate models to simulate those mechanisms, particularly beneath the floating ice shelves. We used a circum-Antarctic ocean-ice shelf model to assess the contribution of surface fluxes, mixing, and ocean-ice shelf interaction to the WMT on the continental shelf. The salt budget dominates the WMT rates, with the basal melt of ice shelves driving buoyancy gain at lighter density classes and salt input at coastal polynyas driving buoyancy loss at heavier densities. We found a considerable sensitivity of the WMT rates to model horizontal resolution, tides and topography within the Filchner-Ronne, East and West Antarctica ice shelf cavities. In the Filchner-Ronne Ice Shelf, an anticyclonic circulation in front of the Ronne Depression regulates the rates of basal melting/refreezing and WMT and is substantially affected by tides and model resolution. Model resolution is also found to affect the Antarctic Slope Current in both East and West Antarctica, impacting the on-shelf heat delivery, basal melt and WMT. These results highlight the importance of resolving tides and small-scale features of the flow and topography to adequately represent water mass transformations on the shelf that directly influence the abyssal global overturning circulation.