The Cryosphere
The Cryosphere
TC
Articles | Volume 20, issue 9
Articles | Volume 20, issue 9
https://doi.org/10.5194/tc-20-5247-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-20-5247-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 20, issue 9
Research article
 | 
21 Sep 2026
Research article |  | 21 Sep 2026

Temporal evolution of the Petermann Ice Shelf estuary constrained by satellite remote sensing observations

Michela Savignano, Alison F. Banwell, Waleed Abdalati, Robin E. Bell, Alexandra Boghosian, W. Roger Buck, Sarah E. Esenther, Emily Glazer, Adam L. LeWinter, Laurence C. Smith, and Leigh A. Stearns

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Short summary
Surface rivers can transport meltwater from floating ice-shelves into the ocean, limiting ponding. However, if a river channel deepens to sea level, seawater can flow up into it and form an ice-shelf estuary. This adds load to the ice shelf and increases stresses that weaken the ice. Using high-resolution satellite imagery, we develop a new way to measure how quickly these rivers deepen, which we use to constrain the timing of Petermann Ice Shelf’s estuary formation over multiple melt seasons.
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