Relevance of field observations as boundary conditions for understanding ice-sheet-ocean interactions


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Olaf.Eisen [ at ] awi.de

Abstract

The direct contact of warm ocean water with the front and base of ice shelves is the main driver for accelerated mass loss of the Antarctic ice sheet. We present a compilation of observations from various projects and methodological approaches applied over the last decade along the Dronning Maud Land coast and highlight their importance for understanding the ice-ocean interactions. With a focus on the Ekström ice shelf, these include spatially continuous seismic observations in combination with airborne gravity inversion to yield sub-shelf bathymetry and geomorphological evidence of past ice-flow activity; ice-dynamic numerical modelling to investigate the role of seafloor/subglacial substrate characteristics to enhance or reduce ice-sheet extent and advance/retreat rates; sub-shelf CTD measurements to determine ocean properties driving basal melting; satellitebased remote sensing to determine ice-shelf height changes and spatially-distributed basal melting; and point measurements of basal melt with surface-based phase-sensitive radar to determine ocean-driven melt and validate remote-sensing products. As the Dronning Maud Land coast plays a critical role in preconditioning the water mass of the coastal current before it enters the Filcher ice-shelf cavity, we argue that a coordinated inter- and transdisciplinary observational network is required to facilitate monitoring a potential ice-sheet mass loss in this part of Antarctica.



Item Type
Conference (Talk)
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Primary Division
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Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
Forum for Research into Ice Shelf Processes (FRISP), Virtual conference.
Eprint ID
52324
Cite as
Eisen, O. , Smith, E. C. , Schannwell, C. , Eisermann, H. , Hattermann+, T. , Zeising, O. , Ötting, A. , Berger, S. , Hofstede, C. , Drews, R. , Ehlers, T. , Mayer, C. , Lambrecht, A. , Gromig, R. , Kuhn, G. , Tiedemann, R. , Wilhelms, F. , Läufer, A. , Franke, D. , Gaedicke, C. and Pattyn, F. (2020): Relevance of field observations as boundary conditions for understanding ice-sheet-ocean interactions , Forum for Research into Ice Shelf Processes (FRISP), Virtual conference .


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