The Cryosphere
The Cryosphere
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Articles | Volume 19, issue 11
Articles | Volume 19, issue 11
https://doi.org/10.5194/tc-19-6149-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-19-6149-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 11
Research article
 | 
25 Nov 2025
Research article |  | 25 Nov 2025

Seasonal drainage-system evolution beneath the Greenland Ice Sheet inferred from transient speed-up events

Grace Gjerde, Mark D. Behn, Laura A. Stevens, Sarah B. Das, and Ian Joughin

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Short summary
We characterize the magnitude and variability of transient speed-ups across a Global Positioning System (GPS) array in western Greenland in 2011 and 2012. While we find no relationship between speed-up and runoff, late-season events have larger speed-up amplitudes and are more spatially uniform compared to early season events. These results reflect an evolution toward a less efficient drainage system late in the melt season, with a pervasive system of open surface-to-bed conduits.
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