Preprints
https://doi.org/10.5194/egusphere-2025-4471
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egusphere-2025-4471
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
07 Nov 2025
| 07 Nov 2025
Status: this preprint is open for discussion and under review for The Cryosphere (TC).
Brief communication: Updated grounding line mapping in the Amundsen Sea Embayment, Antarctica, from 1-day repeat Sentinel-1 SAR data
Abstract. Knowledge of Antarctic glacier grounding lines, which mark the transition between grounded and floating ice, is a vital parameter in determining the stability of major ice shelves and hence the ice sheet. Rapid grounding line retreat and associated mass loss has been documented at numerous Antarctic glaciers, particularly in the Amundsen Sea Embayment. However, few comprehensive grounding line mappings exist, particularly from recent years. Here, we utilize a unique record of Sentinel-1 Synthetic Aperture Radar 1-day repeat-pass imagery to generate a comprehensive retrieval of grounding line location in the Amundsen Sea Embayment in 2025 and evaluate recent changes.
How to cite. Andersen, J. K., Millan, R., Rignot, E., Scheuchl, B., Barré, J. B., and Bjørk, A. A.: Brief communication: Updated grounding line mapping in the Amundsen Sea Embayment, Antarctica, from 1-day repeat Sentinel-1 SAR data, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-4471, 2025.
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Jonas Kvist Andersen
CORRESPONDING AUTHOR
Department of Geosciences and Natural Resource Management, University of Copenhagen, 1350 Copenhagen, Denmark
Romain Millan
Univ. Grenoble Alpes, CNRS, IRD, INRAE, Grenoble-INP, IGE (UMR 5001), 38000 Grenoble, France
Eric Rignot
Department of Earth System Science, University of California, Irvine, CA 92697
Radar Science and Engineering Section, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
Bernd Scheuchl
Department of Earth System Science, University of California, Irvine, CA 92697
Jean Baptiste Barré
Department of Earth System Science, University of California, Irvine, CA 92697
Anders Anker Bjørk
Department of Geosciences and Natural Resource Management, University of Copenhagen, 1350 Copenhagen, Denmark
Short summary
We used new satellite radar data from 2025 to map the border where Antarctic glaciers lose contact with the ground and begin to float. This updated map shows recent changes to many glaciers in the Amundsen Sea region, some of which have retreated by several kilometers. Our results help track how Antarctica is responding to climate change and highlight the value of future satellite missions for monitoring ice sheet stability.
We used new satellite radar data from 2025 to map the border where Antarctic glaciers lose...