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Spatially variable drag in the shear-controlled melt parameterisation below ice shelves in NEMO

Urheber*innen

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

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

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

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Zitation

Vallot, D., Jourdain, N., Mathiot, P. (2023): Spatially variable drag in the shear-controlled melt parameterisation below ice shelves in NEMO, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2515


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019373
Zusammenfassung
Currently, in NEMO and in most ocean models, melting parameterisation below ice shelves is controlled by shear stress, which depends on the mean flow in the boundary layer and the so-called coefficient of drag. This parameter, constant in space and time, is usually tuned to approach observed melt at a given ice shelf. This is equivalent to parameterise ice shelf bottoms as smooth surfaces, whereas, in reality, they can be very rough at different scales. As ice shelves are predicted to experience further damage in the future, applying a spatially varying drag might decrease uncertainties related to melt predictions below ice shelves.Here we present a study with a spatially variable coefficient of drag, which depends on the topography and on the first wet cell height. We use the ice shelf parameterisation of NEMO4.2 on a configuration of Amundsen Sea at 12th of a degree.