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Large discrepancies in the estimates of ice discharge from the Antarctic Peninsula when using different ice-thickness datasets

Authors

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

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

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

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

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

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Citation

Shahateet, K., Navarro, F., Seehaus, T., Fürst, J., Braun, M. (2023): Large discrepancies in the estimates of ice discharge from the Antarctic Peninsula when using different ice-thickness datasets, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2336


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018453
Abstract
The Antarctic Peninsula Ice Sheet (APIS) has become a significant contributor to sea-level rise over the last decades. It is crucial to estimate the ice discharge from the APIS outlet glaciers to understand the overall mass balance of Antarctica. In this study, we calculated the ice discharge from the APIS outlet glaciers north of 70 ºS employing four widely used ice-thickness reconstructions. By using a common surface velocity field and flux gates, we found that the estimation of the total volumetric ice discharge between 2014 and 2017 ranges from 52 to 134 km3/y, with a mean of 85 ± 37 km3/y. The significant differences between the results of the total ice discharge, as well as a multi-model normalized root-mean-squared deviation of 1.20 for the whole data set reveal large differences and inconsistencies between the ice-thickness models. This highlights a fundamental issue: the limited availability of accurate ice-thickness measurements and the challenges faced by current models in reconstructing the distribution of ice-thickness in this complex region.