Wintertime supraglacial lake drainage cascade triggers large-scale ice flow response in Greenland

Nathan Maier*, Jonas Kvist Andersen, Jérémie Mouginot, Florent Gimbert, Olivier Gagliardini

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Abstract Surface melt forces summertime ice-flow accelerations on glaciers and ice sheets. Here, we show that large meltwater-forced accelerations also occur during wintertime in Greenland. We document supraglacial lakes (SGLs) draining in cascades at unusually high elevation, causing an expansive flow acceleration over a ∼5200 km2 region during winter. The three-component interferometric surface velocity field and decomposition modeling reveals the underlying flood propagation with unprecedented detail as it traveled over 160 km from the drainage site to the margin, providing novel constraints on subglacial water pathways, drainage morphology, and links with basal sliding. The triggering SGLs continuously grew over 40 years and suddenly released decades of stored meltwater, demonstrating surface melting can impact dynamics well beyond melt production. We show these events are likely common and thus their cumulative impact on dynamics should be further evaluated.
Original languageEnglish
Article number e2022GL102251
JournalGeophysical Research Letters
Volume50
Issue number4
Number of pages11
ISSN0094-8276
DOIs
Publication statusPublished - 2023

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