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Greenland Subglacial Lakes (Subglacial Lakes Observed (Surprising (Thought…
Greenland Subglacial Lakes
Subglacial Lakes Observed
Surface domes then forms depression
i.e. SW Greenland
Surprising
Thought water flowed too quicklu to pool
Yet it has (where surface melt rates = high)
Despite high throughput in subglacial envmt
Flade Isblink
Ice Cap
Very North Greenland
Basin opened up
in ~21 days or less
Surface lowered ~75 m
Crevassing fractured ice above lake
revealing lake outline
since drainage occurred so fast
oven mitt shape
Flade Isblink
Lake Drainage Events
1. Collapse from lake drainage
-
crevassing around edge
2. Supraglacial melt flows through crevasses
on basin margin
3. Lake recharged by surface meltwater
from ice divide eventually
Why 2012 drainage so rapid?
Esp extreme high melt season in 2012
∴ Lake filled (& ice rose) rapidly
(2013 less so...)