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Article Dans Une Revue Geophysical Research Letters Année : 2022

A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers

Adrien Gilbert
Kjetil Thøgersen
Thomas V Schuler
Andreas Kääb

Résumé

Flow variability of ice sheets and glaciers adds a large uncertainty to projections of their evolution and their future contribution to sea level rise (e.g., Mouginot et al., 2019; Ritz et al., 2015; Shepherd et al., 2019). Ice flow variability arises from the complex relationship between sliding speed, stress balance, water pressure, and temperature at the glacier base, all of which, in addition, depend on the properties of the substrate beneath the ice (Cuffey & Paterson, 2010). In particular, the difficulty in computing basal water pressure (e.g., Downs et al., 2018; Flowers, 2015) limits the predictive power of current ice sheet models (Ritz et al., 2015), and therefore the ability to project the future of the cryosphere under climate change. Two-way coupled models of ice flow and subglacial hydrology, in which sliding velocity has an effect on subglacial hydrology and vice-versa (e.g., Hewitt, 2013; Hoffman & Price, 2014; Pimentel et al., 2010), provide useful tools to test the sensitivity of ice dynamics to melt water supply. These models are also needed to evaluate the subglacial hydrology and friction theories by confronting modeled with observed ice velocities (Brinkerhoff et al., 2021). Ice flow and subglacial hydrology models are usually linked by a friction law that relates water pressure, basal shear stress, and sliding velocity, and an equation linking the sliding speed to the efficiency of the distributed drainage system (e.g., Bueler & van Pelt, 2015; Gagliardini & Werder, 2018; Hoffman & Price, 2014). The distributed subglacial drainage system under hard-bedded glaciers consists of a network of connected cavities (
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Dates et versions

hal-03852633 , version 1 (15-11-2022)

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Adrien Gilbert, Florent Gimbert, Kjetil Thøgersen, Thomas V Schuler, Andreas Kääb. A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard‐Bedded Glaciers. Geophysical Research Letters, 2022, 49 (3), ⟨10.1029/2021gl097507⟩. ⟨hal-03852633⟩
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