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Tidewater-glacier response to supraglacial lake drainage

https://doi.org/10.1038/s41467-022-33763-2

Stevens, Laura A. ; Nettles, Meredith ; Davis, James L. ; Creyts, Timothy T. ; Kingslake, Jonathan ; Hewitt, Ian J. ; Stubblefield, Aaron ( October 2022 , Nature Communications)

Abstract
The flow speed of the Greenland Ice Sheet changes dramatically in inland regions when surface meltwater drains to the bed. But ice-sheet discharge to the ocean is dominated by fast-flowing outlet glaciers, where the effect of increasing surface melt on annual discharge is unknown. Observations of a supraglacial lake drainage at Helheim Glacier, and a consequent velocity pulse propagating down-glacier, provide a natural experiment for assessing the impact of changes in injected meltwater, and allow us to interrogate the subglacial hydrological system. We find a highly efficient subglacial drainage system, such that summertime lake drainage has little net effect on ice discharge. Our results question the validity of common remote-sensing approaches for inferring subglacial conditions, knowledge of which is needed for improved projections of sea-level rise.

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