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Towards more physical modeling of frontal ablation of marine- and lake-terminating glaciers in a global glacier evolution model

Authors

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

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

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

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

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Citation

Yang, R., Ultee, L., Hock, R., Rounce, D. (2023): Towards more physical modeling of frontal ablation of marine- and lake-terminating glaciers in a global glacier evolution model, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4515


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021996
Abstract
Due to the poor understanding of marine- and lake-terminating glaciers dynamics, glacier mass loss through frontal ablation is still one of the major uncertainties in global mass change projections. Global glacier models have simulated frontal ablation, if at all, based on a simple empirical linear relationship based on water depth, ice thickness, and glacier width (so-called k-calving). Here we couple the Simple Estimator of Retreat Magnitude and ice flux (SERMeQ), which is a flowline network model of ice dynamics based on viscoplastic rheology, to the Python Glacier Evolution Model (PyGEM) to simulate the frontal ablation of water-terminating glaciers. We apply the model both to the idealized glacier and bedrock geometries as well as several water-terminating glaciers differing in size and climatic setting. Finally, we compare the frontal ablation simulated by SERMeQ with that by the ‘k-calving’ scheme and explore how the frontal ablation impact glacier mass change projections.