Deglacial ice sheet instabilities induced by proglacial lakes

Abstract

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Ice‐Marginal Proglacial Lakes Across Greenland: Present Status and a Possible Future

“…The presence/absence of a lake, water level, water temperature and any sudden changes in those lake properties could affect glacier dynamics within lake catchments. Importantly, the alpine literature (e.g., see citations within Carrivick et al., 2020) and numerical models (Hinck et al., 2020; Quiquet et al., 2021; Sutherland et al., 2020) show that these effects could persist many kilometres up‐ice from those lakes, especially where glaciers sit on retrograde bed slopes (i.e., overdeepened valleys/basins).…”

“…Increases in lake‐terminating ice‐marginal environments will also increase potential for more rapid ice sheet mass loss through both iceberg calving and lake‐enhanced melt of the ice margin itself (e.g., Schomacker, 2010). Ice‐marginal lakes have also been invoked as a potential catalyst for inducing exceptionally rapid ice margin retreat (Carrivick et al., 2020; Hinck et al., 2020; Quiquet et al., 2021; Sutherland et al., 2020), especially where there is progressive ice‐margin retreat down a retrograde bed slope (Truffer and Motyka, 2016) in a manner highlighted for marine termini by Crawford et al. (2021).…”

Glacial Isostatic Adjustment Shapes Proglacial Lakes Over Glacial Cycles

“…Including proglacial lakes explicitly or as boundary conditions in ice‐sheet models enhances ice loss through localized mechanical instabilities (Hinck et al., 2022; Quiquet et al., 2021; Sutherland et al., 2020), which Quiquet et al. (2021) termed “proglacial lake ice sheet instability” (PLISI). Modeling the Laurentide ice sheet, Quiquet et al.…”

“…Modeling the Laurentide ice sheet, Quiquet et al. (2021) found that ice margins retreat faster when abutting proglacial lakes especially if the bedrock dips toward the ice interior (often due to ice loading). This finding suggests that proglacial lakes influence ice‐sheet stability.…”

Patterns of ice recession and ice stream activity for the MIS 2 Laurentide Ice Sheet in Manitoba, Canada

“…In Manitoba, deglacial ice margins were in contact with Lake Agassiz, which likely affected the stability of the ice (Quiquet et al . 2021; Hinck et al . in press).…”