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Reconstructing glacier ice thickness of major Patagonian outlet glaciers

Urheber*innen

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

Blindow,  Norbert
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;

Skvarca,  Piedro
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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Zitation

Koch, M., Blindow, N., Fürst, J., Skvarca, P., Braun, M. (2023): Reconstructing glacier ice thickness of major Patagonian outlet glaciers, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4200


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021639
Zusammenfassung
The southern Patagonian icefield is one of the regions experiencing fast and increasing mass loss of glaciers over the last decades. However, the ice thickness distribution is not well measured but an important input for the reconstruction. In March and April 2022, we conducted an extensive helicopter borne ground penetration radar measurements over two of the largest Argentinian outlet glaciers Perito Moreno and Viedma. During the campaign we achieved 201 km of radar transects revealing more than 110 km of bedrock depths. With a 25 MHz-antenna system attached 20 m below a helicopter of the type EC350 we were able to measure ice thickness of up to 700 m revealing the complex basal topography and over deepening in the glacier troughs close to their terminus. Our findings could be validated by prior bathymetric studies. With the additional thickness observations, we apply a high-resolution mass-conserving approach for glacier ice thickness reconstruction. The inversion technique comprises among others of Sentinel-1 surface velocity fields, TanDEM-X elevation change maps, GPR profiles, bathymetry information and recent surface mass balance and climatic mass balance models. The data set will form the base for future sensitivity experiments considering different climatic forcing and environmental settings.