Estimating Ice Discharge at Greenland's Three Largest Outlet Glaciers Using Local Bedrock Uplift
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Estimating Ice Discharge at Greenland's Three Largest Outlet Glaciers Using Local Bedrock Uplift. / Hansen, Karina; Truffer, Martin; Aschwanden, Andy; Mankoff, Kenneth; Bevis, Michael; Humbert, Angelika; van den Broeke, Michiel R.; Noël, Brice; Bjørk, Anders; Colgan, William; Kjær, Kurt H.; Adhikari, Surendra; Barletta, Valentina; Khan, Shfaqat A.
In: Geophysical Research Letters, Vol. 48, No. 14, e2021GL094252, 2021.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - Estimating Ice Discharge at Greenland's Three Largest Outlet Glaciers Using Local Bedrock Uplift
AU - Hansen, Karina
AU - Truffer, Martin
AU - Aschwanden, Andy
AU - Mankoff, Kenneth
AU - Bevis, Michael
AU - Humbert, Angelika
AU - van den Broeke, Michiel R.
AU - Noël, Brice
AU - Bjørk, Anders
AU - Colgan, William
AU - Kjær, Kurt H.
AU - Adhikari, Surendra
AU - Barletta, Valentina
AU - Khan, Shfaqat A.
N1 - Publisher Copyright: © 2021. The Authors.
PY - 2021
Y1 - 2021
N2 - We present a novel method to estimate dynamic ice loss of Greenland's three largest outlet glaciers: Jakobshavn Isbræ, Kangerlussuaq Glacier, and Helheim Glacier. We use Global Navigation Satellite System (GNSS) stations attached to bedrock to measure elastic displacements of the solid Earth caused by dynamic thinning near the glacier terminus. When we compare our results with discharge, we find a time lag between glacier speedup/slowdown and onset of dynamic thinning/thickening. Our results show that dynamic thinning/thickening on Jakobshavn Isbræ occurs 0.87 ± 0.07 years before speedup/slowdown. This implies that using GNSS time series we are able to predict speedup/slowdown of Jakobshavn Isbræ by up to 10.4 months. For Kangerlussuaq Glacier the lag between thinning/thickening and speedup/slowdown is 0.37 ± 0.17 years (4.4 months). Our methodology and results could be important for studies that attempt to model and understand mechanisms controlling short-term dynamic fluctuations of outlet glaciers in Greenland.
AB - We present a novel method to estimate dynamic ice loss of Greenland's three largest outlet glaciers: Jakobshavn Isbræ, Kangerlussuaq Glacier, and Helheim Glacier. We use Global Navigation Satellite System (GNSS) stations attached to bedrock to measure elastic displacements of the solid Earth caused by dynamic thinning near the glacier terminus. When we compare our results with discharge, we find a time lag between glacier speedup/slowdown and onset of dynamic thinning/thickening. Our results show that dynamic thinning/thickening on Jakobshavn Isbræ occurs 0.87 ± 0.07 years before speedup/slowdown. This implies that using GNSS time series we are able to predict speedup/slowdown of Jakobshavn Isbræ by up to 10.4 months. For Kangerlussuaq Glacier the lag between thinning/thickening and speedup/slowdown is 0.37 ± 0.17 years (4.4 months). Our methodology and results could be important for studies that attempt to model and understand mechanisms controlling short-term dynamic fluctuations of outlet glaciers in Greenland.
KW - glaciers
KW - Greenland
KW - ice discharge
KW - ice loss
KW - land uplift
KW - surface mass balance
U2 - 10.1029/2021GL094252
DO - 10.1029/2021GL094252
M3 - Letter
AN - SCOPUS:85111492929
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 14
M1 - e2021GL094252
ER -
ID: 281652553