Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations
Constraining glacial isostatic adjustment (GIA) i.e. the Earth’s viscoelastic response to past ice changes, is an important task, because GIA is a significant correction in gravity-based ice sheet mass balance estimates. Here, we investigate how temporal variations in the observed and modeled crusta...
Main Authors: | , , , , , |
---|---|
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer
2014
|
Subjects: | |
Online Access: | https://orbit.dtu.dk/en/publications/1b1e0cbc-336f-418e-a403-3d58c8e08bae https://backend.orbit.dtu.dk/ws/files/80913070/nielsen2014.pdf |
id |
ftdtupubl:oai:pure.atira.dk:publications/1b1e0cbc-336f-418e-a403-3d58c8e08bae |
---|---|
record_format |
openpolar |
spelling |
ftdtupubl:oai:pure.atira.dk:publications/1b1e0cbc-336f-418e-a403-3d58c8e08bae 2024-09-15T18:09:10+00:00 Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations Nielsen, Karina Sørensen, Louise Sandberg Khan, Shfaqat Abbas Spada, Giorgio Simonsen, Sebastian Bjerregaard Forsberg, René Rizos, C. Willis, P. 2014 application/pdf https://orbit.dtu.dk/en/publications/1b1e0cbc-336f-418e-a403-3d58c8e08bae https://backend.orbit.dtu.dk/ws/files/80913070/nielsen2014.pdf eng eng Springer https://orbit.dtu.dk/en/publications/1b1e0cbc-336f-418e-a403-3d58c8e08bae urn:ISBN:978-3-642-37221-6 info:eu-repo/semantics/restrictedAccess Nielsen , K , Sørensen , L S , Khan , S A , Spada , G , Simonsen , S B & Forsberg , R 2014 , Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations . in C Rizos & P Willis (eds) , Earth on the Edge: Science for a Sustainable Planet . Springer , International Association of Geodesy Symposia , vol. 139 , pp. 325-331 , 2011 IAG General Assembly , Melbourne , Australia , 28/06/2011 . contributionToPeriodical 2014 ftdtupubl 2024-07-01T23:52:53Z Constraining glacial isostatic adjustment (GIA) i.e. the Earth’s viscoelastic response to past ice changes, is an important task, because GIA is a significant correction in gravity-based ice sheet mass balance estimates. Here, we investigate how temporal variations in the observed and modeled crustal displacements due to the Earth’s response to ongoing ice mass changes can contribute to the process of constraining GIA. We use mass change grids of the Greenland ice sheet (GrIS) derived from NASA’s high resolution Ice, Cloud and land Elevation Satellite (ICESat) data in three overlapping time spans covering the period 2004–2009 to estimate temporal variations in the elastic response due to present day ice mass loss. The modeled crustal displacements (elastic + GIA) are compared with GPS time series from five permanent sites (KELY, KULU, QAQ1, THU2, and SCOR). We find, that the modeled pattern of elastic crustal displacements shows pronounced variation during the observation period, where an increase in elastic displacement is found at the northwest coast of Greenland, while a decrease is found at the southeast coast. This pattern of temporal changes is supported by the GPS observations. We find, that the temporal behavior of the ICESat-based modeled elastic response agrees well with the GPS observations at the sites KELY, QAQ1, and SCOR. This suggests, that our elastic models are able to resolve the temporal changes in the observed uplift, which indicates that the elastic uplift models are reliable at these sites. Therefore, we conclude that these sites are useful for constraining GIA. Article in Journal/Newspaper Greenland Ice Sheet Technical University of Denmark: DTU Orbit |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Constraining glacial isostatic adjustment (GIA) i.e. the Earth’s viscoelastic response to past ice changes, is an important task, because GIA is a significant correction in gravity-based ice sheet mass balance estimates. Here, we investigate how temporal variations in the observed and modeled crustal displacements due to the Earth’s response to ongoing ice mass changes can contribute to the process of constraining GIA. We use mass change grids of the Greenland ice sheet (GrIS) derived from NASA’s high resolution Ice, Cloud and land Elevation Satellite (ICESat) data in three overlapping time spans covering the period 2004–2009 to estimate temporal variations in the elastic response due to present day ice mass loss. The modeled crustal displacements (elastic + GIA) are compared with GPS time series from five permanent sites (KELY, KULU, QAQ1, THU2, and SCOR). We find, that the modeled pattern of elastic crustal displacements shows pronounced variation during the observation period, where an increase in elastic displacement is found at the northwest coast of Greenland, while a decrease is found at the southeast coast. This pattern of temporal changes is supported by the GPS observations. We find, that the temporal behavior of the ICESat-based modeled elastic response agrees well with the GPS observations at the sites KELY, QAQ1, and SCOR. This suggests, that our elastic models are able to resolve the temporal changes in the observed uplift, which indicates that the elastic uplift models are reliable at these sites. Therefore, we conclude that these sites are useful for constraining GIA. |
author2 |
Rizos, C. Willis, P. |
format |
Article in Journal/Newspaper |
author |
Nielsen, Karina Sørensen, Louise Sandberg Khan, Shfaqat Abbas Spada, Giorgio Simonsen, Sebastian Bjerregaard Forsberg, René |
spellingShingle |
Nielsen, Karina Sørensen, Louise Sandberg Khan, Shfaqat Abbas Spada, Giorgio Simonsen, Sebastian Bjerregaard Forsberg, René Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations |
author_facet |
Nielsen, Karina Sørensen, Louise Sandberg Khan, Shfaqat Abbas Spada, Giorgio Simonsen, Sebastian Bjerregaard Forsberg, René |
author_sort |
Nielsen, Karina |
title |
Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations |
title_short |
Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations |
title_full |
Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations |
title_fullStr |
Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations |
title_full_unstemmed |
Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations |
title_sort |
towards constraining glacial isostatic adjustment in greenland using icesat and gps observations |
publisher |
Springer |
publishDate |
2014 |
url |
https://orbit.dtu.dk/en/publications/1b1e0cbc-336f-418e-a403-3d58c8e08bae https://backend.orbit.dtu.dk/ws/files/80913070/nielsen2014.pdf |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Nielsen , K , Sørensen , L S , Khan , S A , Spada , G , Simonsen , S B & Forsberg , R 2014 , Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations . in C Rizos & P Willis (eds) , Earth on the Edge: Science for a Sustainable Planet . Springer , International Association of Geodesy Symposia , vol. 139 , pp. 325-331 , 2011 IAG General Assembly , Melbourne , Australia , 28/06/2011 . |
op_relation |
https://orbit.dtu.dk/en/publications/1b1e0cbc-336f-418e-a403-3d58c8e08bae urn:ISBN:978-3-642-37221-6 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1810446577322426368 |