Estimating Ice Discharge at Greenland's Three Largest Outlet Glaciers Using Local Bedrock Uplift
Hansen, Karina,
Truffer, Martin,
Aschwanden, A.,
Mankoff, Kenneth D.,
Bevis, Michael,
Humbert, Angelika
ORCID: https://orcid.org/0000-0002-0244-8760,
Broeke, M. R. van den,
Noël, Brice P. Y.,
Bjørk, Anders A.,
Colgan, William,
Kjær, K.,
Adhikari, Surendra,
Barletta, Valentina and
Khan, Shfaqat Abbas
;
Contact
Angelika.Humbert [ at ] awi.de
Abstract
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.
Item Type
Article
Authors
Hansen, Karina,
Truffer, Martin,
Aschwanden, A.,
Mankoff, Kenneth D.,
Bevis, Michael,
Humbert, Angelika
ORCID: https://orcid.org/0000-0002-0244-8760,
Broeke, M. R. van den,
Noël, Brice P. Y.,
Bjørk, Anders A.,
Colgan, William,
Kjær, K.,
Adhikari, Surendra,
Barletta, Valentina and
Khan, Shfaqat Abbas
;
Divisions
Primary Division
Programs
Primary Topic
Helmholtz Cross Cutting Activity (2021-2027)
Publication Status
Published
Eprint ID
55266
DOI
10.1029/2021GL094252
Cite as
Hansen, K.
,
Truffer, M.
,
Aschwanden, A.
,
Mankoff, K. D.
,
Bevis, M.
,
Humbert, A.
,
Broeke, M. R. v. d.
,
Noël, B. P. Y.
,
Bjørk, A. A.
,
Colgan, W.
,
Kjær, K.
,
Adhikari, S.
,
Barletta, V.
and
Khan, S. A.
(2021):
Estimating Ice Discharge at Greenland's Three Largest Outlet Glaciers Using Local Bedrock Uplift
,
Geophysical Research Letters,
48
(14)
.
doi: 10.1029/2021GL094252
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