Wintertime Supraglacial Lake Drainage Cascade Triggers Large-Scale Ice Flow Response in Greenland
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Wintertime Supraglacial Lake Drainage Cascade Triggers Large-Scale Ice Flow Response in Greenland. / Maier, Nathan; Andersen, Jonas Kvist; Mouginot, Jeremie; Gimbert, Florent; Gagliardini, Olivier.
I: Geophysical Research Letters, Bind 50, Nr. 4, e2022GL102251, 2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Wintertime Supraglacial Lake Drainage Cascade Triggers Large-Scale Ice Flow Response in Greenland
AU - Maier, Nathan
AU - Andersen, Jonas Kvist
AU - Mouginot, Jeremie
AU - Gimbert, Florent
AU - Gagliardini, Olivier
PY - 2023
Y1 - 2023
N2 - Surface melt forces summertime ice-flow accelerations on glaciers and ice sheets. Here, we show that large meltwater-forced accelerations also occur during wintertime in Greenland. We document supraglacial lakes (SGLs) draining in cascades at unusually high elevation, causing an expansive flow acceleration over a similar to 5,200 km(2) region during winter. The three-component interferometric surface velocity field and decomposition modeling reveal the underlying flood propagation with unprecedented detail as it traveled over 160 km from the drainage site to the margin, providing novel constraints on subglacial water pathways, drainage morphology, and links with basal sliding. The triggering SGLs continuously grew over 40 years and suddenly released decades of stored meltwater, demonstrating surface melting can impact dynamics well beyond melt production. We show these events are likely common and thus their cumulative impact on dynamics should be further evaluated.
AB - Surface melt forces summertime ice-flow accelerations on glaciers and ice sheets. Here, we show that large meltwater-forced accelerations also occur during wintertime in Greenland. We document supraglacial lakes (SGLs) draining in cascades at unusually high elevation, causing an expansive flow acceleration over a similar to 5,200 km(2) region during winter. The three-component interferometric surface velocity field and decomposition modeling reveal the underlying flood propagation with unprecedented detail as it traveled over 160 km from the drainage site to the margin, providing novel constraints on subglacial water pathways, drainage morphology, and links with basal sliding. The triggering SGLs continuously grew over 40 years and suddenly released decades of stored meltwater, demonstrating surface melting can impact dynamics well beyond melt production. We show these events are likely common and thus their cumulative impact on dynamics should be further evaluated.
U2 - 10.1029/2022GL102251
DO - 10.1029/2022GL102251
M3 - Journal article
VL - 50
JO - Geophysical Research Letters (Online)
JF - Geophysical Research Letters (Online)
SN - 1944-8007
IS - 4
M1 - e2022GL102251
ER -
ID: 356885806