Brief communication: Updated grounding line mapping in the Amundsen Sea Embayment, Antarctica, from one day repeat Sentinel-1 SAR data

Andersen, Jonas K.; Millan, Romain; Rignot, Eric; Gimenes, Lucille; Scheuchl, Bernd; Barré, Jean Baptiste; Bjørk, Anders A.

doi:10.5194/tc-20-1589-2026

Articles | Volume 20, issue 3

https://doi.org/10.5194/tc-20-1589-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/tc-20-1589-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 3

Brief communication

|

16 Mar 2026

Brief communication |

| 16 Mar 2026

Brief communication: Updated grounding line mapping in the Amundsen Sea Embayment, Antarctica, from one day repeat Sentinel-1 SAR data

Jonas K. Andersen, Romain Millan, Eric Rignot, Lucille Gimenes, Bernd Scheuchl, Jean Baptiste Barré, and Anders A. Bjørk

Supplement

https://doi.org/10.5194/tc-20-1589-2026-supplement

Data sets

Updated grounding line mapping in the Amundsen Sea Embayment, Antarctica, from 1 d repeat Sentinel-1 SAR data J. K. Andersen et al. https://doi.org/10.5281/ZENODO.18503724

MEaSUREs Antarctic Grounding Line from Differential Satellite Radar Interferometry E. Rignot et al. https://doi.org/10.5067/IKBWW4RYHF1Q

MEaSUREs InSAR-Based Antarctica Ice Velocity Map E. Rignot et al. https://doi.org/10.5067/D7GK8F5J8M8R

Grounding line for key glaciers, Antarctica, derived from ERS-1/2, TerraSAR-X and Copernicus Sentinel-1 data acquired in 1994–2021 ESA AIS CCI https://climate.esa.int/en/projects/ice-sheets-antarctic/

The Reference Elevation Model of Antarctica – Mosaics I. Howat et al. https://doi.org/10.7910/DVN/EBW8UC

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.