Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift
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 ca...
Published in: | Geophysical Research Letters |
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2021
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ftdtupubl:oai:pure.atira.dk:publications/ae0b6c7b-f4cc-4536-99d2-1968d58ee10a 2024-09-15T18:07:40+00:00 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 Broeke, Michiel R. Noël, Brice Bjørk, Anders Colgan, William Kjær, Kurt H Adhikari, Surendra Barletta, Valentina Khan, Shfaqat A. 2021 application/pdf https://orbit.dtu.dk/en/publications/ae0b6c7b-f4cc-4536-99d2-1968d58ee10a https://doi.org/10.1029/2021GL094252 https://backend.orbit.dtu.dk/ws/files/259139508/2021GL094252_1_.pdf eng eng https://orbit.dtu.dk/en/publications/ae0b6c7b-f4cc-4536-99d2-1968d58ee10a info:eu-repo/semantics/openAccess Hansen , K , Truffer , M , Aschwanden , A , Mankoff , K , Bevis , M , Humbert , A , Broeke , M R , Noël , B , Bjørk , A , Colgan , W , Kjær , K H , Adhikari , S , Barletta , V & Khan , S A 2021 , ' Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift ' , Geophysical Research Letters , vol. 48 , no. 14 , e2021GL094252 . https://doi.org/10.1029/2021GL094252 article 2021 ftdtupubl https://doi.org/10.1029/2021GL094252 2024-08-13T00:03:06Z 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. Article in Journal/Newspaper glacier Greenland Jakobshavn Jakobshavn isbræ Kangerlussuaq Technical University of Denmark: DTU Orbit Geophysical Research Letters 48 14 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Hansen, Karina Truffer, Martin Aschwanden, Andy Mankoff, Kenneth Bevis, Michael Humbert, Angelika Broeke, Michiel R. Noël, Brice Bjørk, Anders Colgan, William Kjær, Kurt H Adhikari, Surendra Barletta, Valentina Khan, Shfaqat A. |
spellingShingle |
Hansen, Karina Truffer, Martin Aschwanden, Andy Mankoff, Kenneth Bevis, Michael Humbert, Angelika Broeke, Michiel R. Noël, Brice Bjørk, Anders Colgan, William Kjær, Kurt H Adhikari, Surendra Barletta, Valentina Khan, Shfaqat A. Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift |
author_facet |
Hansen, Karina Truffer, Martin Aschwanden, Andy Mankoff, Kenneth Bevis, Michael Humbert, Angelika Broeke, Michiel R. Noël, Brice Bjørk, Anders Colgan, William Kjær, Kurt H Adhikari, Surendra Barletta, Valentina Khan, Shfaqat A. |
author_sort |
Hansen, Karina |
title |
Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift |
title_short |
Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift |
title_full |
Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift |
title_fullStr |
Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift |
title_full_unstemmed |
Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift |
title_sort |
estimating ice discharge at greenland's three largest outlet glaciers using local bedrock uplift |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/ae0b6c7b-f4cc-4536-99d2-1968d58ee10a https://doi.org/10.1029/2021GL094252 https://backend.orbit.dtu.dk/ws/files/259139508/2021GL094252_1_.pdf |
genre |
glacier Greenland Jakobshavn Jakobshavn isbræ Kangerlussuaq |
genre_facet |
glacier Greenland Jakobshavn Jakobshavn isbræ Kangerlussuaq |
op_source |
Hansen , K , Truffer , M , Aschwanden , A , Mankoff , K , Bevis , M , Humbert , A , Broeke , M R , Noël , B , Bjørk , A , Colgan , W , Kjær , K H , Adhikari , S , Barletta , V & Khan , S A 2021 , ' Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift ' , Geophysical Research Letters , vol. 48 , no. 14 , e2021GL094252 . https://doi.org/10.1029/2021GL094252 |
op_relation |
https://orbit.dtu.dk/en/publications/ae0b6c7b-f4cc-4536-99d2-1968d58ee10a |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2021GL094252 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
14 |
_version_ |
1810445042430509056 |