GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss
We analyze 2006–2009 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 crustal motion due to the unloading of ice from Jakobshavn I...
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2010
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Online Access: | https://orbit.dtu.dk/en/publications/33edbb29-c932-4b18-8548-0bda7462d42c https://doi.org/10.1029/2010JB007490 https://backend.orbit.dtu.dk/ws/files/5781558/2010JB007490%5B1%5D.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/33edbb29-c932-4b18-8548-0bda7462d42c 2024-05-19T07:27:35+00:00 GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss Khan, Shfaqat Abbas Liu, Lin Wahr, John Howat, Ian Joughin, Ian van Dam, Tonie van Flemming, Kevin 2010 application/pdf https://orbit.dtu.dk/en/publications/33edbb29-c932-4b18-8548-0bda7462d42c https://doi.org/10.1029/2010JB007490 https://backend.orbit.dtu.dk/ws/files/5781558/2010JB007490%5B1%5D.pdf eng eng https://orbit.dtu.dk/en/publications/33edbb29-c932-4b18-8548-0bda7462d42c info:eu-repo/semantics/openAccess Khan , S A , Liu , L , Wahr , J , Howat , I , Joughin , I , van Dam , T V & Flemming , K 2010 , ' GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss ' , Journal of Geophysical Research: Atmospheres , vol. 115 , no. B9 , pp. B09405 . https://doi.org/10.1029/2010JB007490 article 2010 ftdtupubl https://doi.org/10.1029/2010JB007490 2024-04-24T00:28:05Z We analyze 2006–2009 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 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−1 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. Our estimate of Jakobshavn’s contribution to uplift rates at Kangia North and Ilulissat are 14.6 ± 1.7 mm yr−1 and 4.9 ± 1.1 mm yr−1, respectively. 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−1 between 2006 and 2009. At Kangia North and Ilulissat, the predicted uplift rates computed using thinning estimates from the ATM laser altimetry are 12.1 ± 0.9 mm yr−1 and 3.2 ± 0.3 mm yr−1, respectively. The observed rates are slightly larger than the predicted rates. 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. Article in Journal/Newspaper Airborne Topographic Mapper glacier Greenland Ilulissat Jakobshavn Jakobshavn isbræ Kangia Technical University of Denmark: DTU Orbit Journal of Geophysical Research 115 B9 |
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Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
description |
We analyze 2006–2009 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 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−1 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. Our estimate of Jakobshavn’s contribution to uplift rates at Kangia North and Ilulissat are 14.6 ± 1.7 mm yr−1 and 4.9 ± 1.1 mm yr−1, respectively. 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−1 between 2006 and 2009. At Kangia North and Ilulissat, the predicted uplift rates computed using thinning estimates from the ATM laser altimetry are 12.1 ± 0.9 mm yr−1 and 3.2 ± 0.3 mm yr−1, respectively. The observed rates are slightly larger than the predicted rates. 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 |
Article in Journal/Newspaper |
author |
Khan, Shfaqat Abbas Liu, Lin Wahr, John Howat, Ian Joughin, Ian van Dam, Tonie van Flemming, Kevin |
spellingShingle |
Khan, Shfaqat Abbas Liu, Lin Wahr, John Howat, Ian Joughin, Ian van Dam, Tonie van Flemming, Kevin GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss |
author_facet |
Khan, Shfaqat Abbas Liu, Lin Wahr, John Howat, Ian Joughin, Ian van Dam, Tonie van Flemming, Kevin |
author_sort |
Khan, Shfaqat Abbas |
title |
GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss |
title_short |
GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss |
title_full |
GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss |
title_fullStr |
GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss |
title_full_unstemmed |
GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss |
title_sort |
gps measurements of crustal uplift near jakobshavn isbræ due to glacial ice mass loss |
publishDate |
2010 |
url |
https://orbit.dtu.dk/en/publications/33edbb29-c932-4b18-8548-0bda7462d42c https://doi.org/10.1029/2010JB007490 https://backend.orbit.dtu.dk/ws/files/5781558/2010JB007490%5B1%5D.pdf |
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 , Liu , L , Wahr , J , Howat , I , Joughin , I , van Dam , T V & Flemming , K 2010 , ' GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss ' , Journal of Geophysical Research: Atmospheres , vol. 115 , no. B9 , pp. B09405 . https://doi.org/10.1029/2010JB007490 |
op_relation |
https://orbit.dtu.dk/en/publications/33edbb29-c932-4b18-8548-0bda7462d42c |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2010JB007490 |
container_title |
Journal of Geophysical Research |
container_volume |
115 |
container_issue |
B9 |
_version_ |
1799483562350608384 |