Monitoring ice-calving at the Astrolabe glacier (Antarctica) with seismological and Sentinel-2 satellite data

• Main Authors: Provost, Floriane, Malet, Jean-Philippe, Zigone, Dimitri, Le Meur, Emmanuel, Hibert, Clément
• Other Authors: Université Laval Québec (ULaval), Institut Terre Environnement Strasbourg (ITES), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Ecole et Observatoire des Sciences de la Terre (EOST), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Résif
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2021
• Subjects: RESIF; Seismology; Epos-France; Sismologie; [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]; Antarc*; Antarctic; Antarctica; Astrolabe Glacier; Ice Sheet; Ice Shelf; Sea ice; Tidewater
• Online Access: https://hal.science/hal-03442663; https://hal.science/hal-03442663/document; https://hal.science/hal-03442663/file/Resif2021_1Slide_Astrolabe_Provost.pdf

Dans le cadre de l’intégration aux dispositions européens EPOS, Résif s'est transformé en octobre 2023 en Epos-France, une nouvelle infrastructure de recherche aux contours thématiques plus larges et en accord avec ceux de sa grande sœur européenne. 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.