Monitoring ice-calving at the Astrolabe glacier (Antarctica) with seismological and Sentinel-2 satellite data
International audience Better understanding the global (e.g. ice mass balance, ice motion) and local (e.g. fissures and calving processes, basal melting, sea-ice interactions) dynamics of tidewater Antarctic outlet glaciers is of paramount importance to simulate the ice-sheet response to global warm...
Main Authors: | , , , , |
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Other Authors: | , , , , , , , , |
Format: | Conference Object |
Language: | English |
Published: |
HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-03442663 https://hal.archives-ouvertes.fr/hal-03442663/document https://hal.archives-ouvertes.fr/hal-03442663/file/Resif2021_1Slide_Astrolabe_Provost.pdf |
Summary: | International audience Better understanding the global (e.g. ice mass balance, ice motion) and local (e.g. fissures and calving processes, basal melting, sea-ice interactions) dynamics of tidewater Antarctic outlet glaciers is of paramount importance to simulate the ice-sheet response to global warming. The Astrolable glacier is located in Terre Adélie (140°E, 67°S) near the Dumont d'Urville French research station. Recently, a large fissure of around 3km has been observed in the western shore of the glacier which could lead to a calving of ca. 28km2. We used two monitoring techniques: optical remote sensing and seismology to analyze changes in the activity of the glacier. We computed the surface velocity and strain rates from time series of multispectral Sentinel-2 imagery. The joint analysis of the seismological data and the velocity and strain maps are discussed with the recent evolution of the ice-shelf. The strain maps show complex patterns of extension and compression areas with a seasonal increase during the summer months. The number of calving events significantly increased during 2016-2021 in comparison with the period 2012-2016. |
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