Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss
We analyze GPS data from four continuous Global Positioning System (GPS) receivers located between 5 and 150 km from the glacier Jakobshavn Isbræ, West Greenland. The GPS stations were established on bedrock to determine the vertical and horizontal crustal motion due to the unloading of ice from Jak...
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ftdtupubl:oai:pure.atira.dk:publications/6b2d5ddc-abc0-4ae5-a95d-2d9dc705413e 2024-09-15T17:35:21+00:00 Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss Khan, Shfaqat Abbas Wahr, John Liu, Lin Howat, Ian Joughin, Ian Nielsen, Karina van Dam, T 2011 https://orbit.dtu.dk/en/publications/6b2d5ddc-abc0-4ae5-a95d-2d9dc705413e eng eng https://orbit.dtu.dk/en/publications/6b2d5ddc-abc0-4ae5-a95d-2d9dc705413e info:eu-repo/semantics/restrictedAccess Khan , S A , Wahr , J , Liu , L , Howat , I , Joughin , I , Nielsen , K & van Dam , T 2011 , ' Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss ' , Geophysical Research Abstracts , vol. 13 . conferenceObject 2011 ftdtupubl 2024-07-01T23:52:53Z We analyze GPS data from four continuous Global Positioning System (GPS) receivers located between 5 and 150 km from the glacier Jakobshavn Isbræ, West Greenland. The GPS stations were established on bedrock to determine the vertical and horizontal crustal motion due to the unloading of ice from Jakobshavn Isbræ. All stations experienced uplift, but the uplift rate at Kangia North, only 5 km from the glacier front, was about 10 mm/yr larger than the rate at Ilulissat, located only 45 km further away. This suggests that most of the uplift is due to the unloading of the Earth’s surface as Jakobshavn thins and loses mass. The observed rates are consistent with a glacier thinning model based on repeat altimeter surveys from NASA’s Airborne Topographic Mapper (ATM), which shows that Jakobshavn lost mass at an average rate of 22 +- 2 km3/yr between 2006 and 2009. The fact that the GPS uplift rates are much larger closer to Jakobshavn than further away, and are consistent with rates inferred using the ATM-based glacier thinning model, shows that GPS measurements of crustal motion are a potentially useful method for assessing ice-mass change models. Conference Object Airborne Topographic Mapper glacier Greenland Ilulissat Jakobshavn Jakobshavn isbræ Kangia Technical University of Denmark: DTU Orbit |
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Open Polar |
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Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
description |
We analyze GPS data from four continuous Global Positioning System (GPS) receivers located between 5 and 150 km from the glacier Jakobshavn Isbræ, West Greenland. The GPS stations were established on bedrock to determine the vertical and horizontal crustal motion due to the unloading of ice from Jakobshavn Isbræ. All stations experienced uplift, but the uplift rate at Kangia North, only 5 km from the glacier front, was about 10 mm/yr larger than the rate at Ilulissat, located only 45 km further away. This suggests that most of the uplift is due to the unloading of the Earth’s surface as Jakobshavn thins and loses mass. The observed rates are consistent with a glacier thinning model based on repeat altimeter surveys from NASA’s Airborne Topographic Mapper (ATM), which shows that Jakobshavn lost mass at an average rate of 22 +- 2 km3/yr between 2006 and 2009. The fact that the GPS uplift rates are much larger closer to Jakobshavn than further away, and are consistent with rates inferred using the ATM-based glacier thinning model, shows that GPS measurements of crustal motion are a potentially useful method for assessing ice-mass change models. |
format |
Conference Object |
author |
Khan, Shfaqat Abbas Wahr, John Liu, Lin Howat, Ian Joughin, Ian Nielsen, Karina van Dam, T |
spellingShingle |
Khan, Shfaqat Abbas Wahr, John Liu, Lin Howat, Ian Joughin, Ian Nielsen, Karina van Dam, T Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss |
author_facet |
Khan, Shfaqat Abbas Wahr, John Liu, Lin Howat, Ian Joughin, Ian Nielsen, Karina van Dam, T |
author_sort |
Khan, Shfaqat Abbas |
title |
Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss |
title_short |
Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss |
title_full |
Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss |
title_fullStr |
Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss |
title_full_unstemmed |
Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss |
title_sort |
vertical and horizontal bedrock displacements near jakobshavn isbræ due to glacial ice mass loss |
publishDate |
2011 |
url |
https://orbit.dtu.dk/en/publications/6b2d5ddc-abc0-4ae5-a95d-2d9dc705413e |
genre |
Airborne Topographic Mapper glacier Greenland Ilulissat Jakobshavn Jakobshavn isbræ Kangia |
genre_facet |
Airborne Topographic Mapper glacier Greenland Ilulissat Jakobshavn Jakobshavn isbræ Kangia |
op_source |
Khan , S A , Wahr , J , Liu , L , Howat , I , Joughin , I , Nielsen , K & van Dam , T 2011 , ' Vertical and horizontal bedrock displacements near Jakobshavn Isbræ due to glacial ice mass loss ' , Geophysical Research Abstracts , vol. 13 . |
op_relation |
https://orbit.dtu.dk/en/publications/6b2d5ddc-abc0-4ae5-a95d-2d9dc705413e |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1810453455525904384 |