Antarctic surface water intrusion triggering seasonal rapid basal melting of 
drygalski ice tongue, east Antarctica

Wang, Xianwei; Nicholls, Keith; Lee, Won Sang; Lee, Choon Ki; Stevens, Craig; Holland, David

doi:10.57757/IUGG23-1619

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Antarctic surface water intrusion triggering seasonal rapid basal melting of drygalski ice tongue, east Antarctica

Urheber*innen

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

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

Lee, Won Sang
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lee, Choon Ki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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Zitation

Wang, X., Nicholls, K., Lee, W. S., Lee, C. K., Stevens, C., Holland, D. (2023): Antarctic surface water intrusion triggering seasonal rapid basal melting of drygalski ice tongue, east Antarctica, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1619

Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017985

Zusammenfassung

Antarctic glaciers are losing ice rapidly to the ocean through basal melting of ice shelves/tongues. To better predicate future sea level rise, it is urgent to detect the rapid basal melting of ice shelves/tongues as well as ocean’s role in this process. In this study, basal melting of Drygalski Ice Tongue (DIT), the seaward extension of David Glacier in Northern Victoria Land, East Antarctica has been detected using a surface deployed Autonomous Phase-sensitive Radio-Echo-Sounder (ApRES). The ocean water changes adjacent to DIT front has been revealed using an ocean mooring. ApRES observation suggests a rapid basal melting > 10 m/a close to DIT front in February and mooring data shows a synchronous ocean warming in austral summer, indicating Antarctica Surface Water intrusion to the base of DIT. The mooring data has been used to simulate the basal melting of DIT front, which coincides with ApRES measurements. We conclude that rapid basal melting close to the tongue front was likely triggered by intrusion of Antarctica Surface Water in austral summer. Glacier-ocean interactions, such as glacier basal melting, can be detected from spaceborne, terrestrial and oceanic observations and are important processes to predict future sea level changes. To better understand the driving forces of glacier changes, multi-disciplinary observation and numerical modeling are required.