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Over-winter persistence of supraglacial lakes on the Greenland Ice Sheet: results and insights from a new model
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2020
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Source: Journal of Glaciology, 66(257), 362-372
[PDF-1.54 MB]
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Journal Title:Journal of Glaciology
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Description:We present a newly developed 1-D numerical energy-balance and phase transition supraglacial lake model: GlacierLake. GlacierLake incorporates snowfall, in situ snow and ice melt, incoming water from the surrounding catchment, ice lid formation, basal freeze-up and thermal stratification. Snow cover and temperature are varied to test lake development through winter and the maximum lid thickness is recorded. Average wintertime temperatures of −2 to and total snowfall of 0 to 3.45 m lead to a range of the maximum lid thickness from 1.2 to 2.8 m after days, with snow cover exerting the dominant control. An initial ice temperature of with simulated advection of cold ice from upstream results in 0.6 m of basal freeze-up. This suggests that lakes with water depths above 1.3 to 3.4 m (dependent on winter snowfall and temperature) upon lid formation will persist through winter. These buried lakes can provide a sizeable water store at the start of the melt season, expedite future lake formation and warm underlying ice even in winter.
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Source:Journal of Glaciology, 66(257), 362-372
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Rights Information:CC BY
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Compliance:Submitted
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