Geodetic measurements of postglacial adjustments in Greenland
peer reviewed We analyze data from seven continuous Global Positioning System (GPS) receivers and one tide gauge, all located along the edge of the Greenland ice sheet, to determine vertical uplift rates. We compare our results with predictions based on the ICE-5G deglaciation model of Peltier (2004...
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American Geophysical Union (AGU)
2008
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Online Access: | https://orbilu.uni.lu/handle/10993/653 https://doi.org/10.1029/2007JB004956 |
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ftunivluxembourg:oai:orbilu.uni.lu:10993/653 2024-04-21T08:03:07+00:00 Geodetic measurements of postglacial adjustments in Greenland Khan, S. A. Wahr, J. Leuliette, E. van Dam, Tonie Larson, K. M. Francis, Olivier 2008 https://orbilu.uni.lu/handle/10993/653 https://doi.org/10.1029/2007JB004956 en eng American Geophysical Union (AGU) urn:issn:2156-2202 https://orbilu.uni.lu/handle/10993/653 info:hdl:10993/653 doi:10.1029/2007JB004956 scopus-id:2-s2.0-42149089217 wos:000253236400001 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Journal of Geophysical Research (2008) GIA Greenland GPS Physical chemical mathematical & earth Sciences Physics Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2008 ftunivluxembourg https://doi.org/10.1029/2007JB004956 2024-03-27T14:10:06Z peer reviewed We analyze data from seven continuous Global Positioning System (GPS) receivers and one tide gauge, all located along the edge of the Greenland ice sheet, to determine vertical uplift rates. We compare our results with predictions based on the ICE-5G deglaciation model of Peltier (2004). Results from the GPS receiver at Kellyville (-1.2 ± 1.1 mm/a) and from the tide gauge at Nuuk (-2.2 ± 1.3 mm/a), indicate that ICE-5G overestimates the subsidence rates at those locations by 2.1 and 1.1 mm/a, respectively. Kellyville and Nuuk are located along the southwestern margin of the Greenland ice sheet, and the observed negative uplift rates are consistent with independent evidence that the ice margin along the southwestern edge readvanced during the last ~8 ka to its current position. The ICE-5G glaciation-deglaciation history includes a readvance between the latitudes of 62°N and 72°N. The GPS measurements suggest the ICE-5G readvance may be too large or mistimed. Our GPS results at Qaqortoq, located at the southern tip of Greenland, suggest a secular subsidence rate of ????0.3 ± 1.1 mm/a, while ICE-5G predicts an uplift rate of 1.0 mm/a. ICE-5G assumes no ice sheet readvance in south Greenland, including no readvance of the Qassimiut lobe. The difference of 1.3 ± 1.1 mm/a can tentatively be explained as due to a ~33 km readvance of the Qassimiut lobe during the last ~3 ka. For the other GPS sites, the observed/predicted uplift rates are 3.6 ± 1.1/-0.1 mm/a at Thule, 0.0 ± 1.1/2.0 mm/a at Scoresbysund, and -0.4 ± 1.1/-1.7 mm/a at Kulusuk. For Thule, Kulusuk, and Scoresbysund the differences between the observed and predicted rates are on the order of 1.3 – 3.7 mm/a, though with opposite signs, and indicate that ICE-5G does not exactly reproduce the correct rebound signal at those locations. Article in Journal/Newspaper Greenland Ice Sheet Kulusuk Nuuk Qaqortoq Qassimiut Scoresbysund Thule University of Luxembourg: ORBilu - Open Repository and Bibliography Journal of Geophysical Research: Solid Earth 113 B2 |
institution |
Open Polar |
collection |
University of Luxembourg: ORBilu - Open Repository and Bibliography |
op_collection_id |
ftunivluxembourg |
language |
English |
topic |
GIA Greenland GPS Physical chemical mathematical & earth Sciences Physics Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
GIA Greenland GPS Physical chemical mathematical & earth Sciences Physics Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Khan, S. A. Wahr, J. Leuliette, E. van Dam, Tonie Larson, K. M. Francis, Olivier Geodetic measurements of postglacial adjustments in Greenland |
topic_facet |
GIA Greenland GPS Physical chemical mathematical & earth Sciences Physics Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed We analyze data from seven continuous Global Positioning System (GPS) receivers and one tide gauge, all located along the edge of the Greenland ice sheet, to determine vertical uplift rates. We compare our results with predictions based on the ICE-5G deglaciation model of Peltier (2004). Results from the GPS receiver at Kellyville (-1.2 ± 1.1 mm/a) and from the tide gauge at Nuuk (-2.2 ± 1.3 mm/a), indicate that ICE-5G overestimates the subsidence rates at those locations by 2.1 and 1.1 mm/a, respectively. Kellyville and Nuuk are located along the southwestern margin of the Greenland ice sheet, and the observed negative uplift rates are consistent with independent evidence that the ice margin along the southwestern edge readvanced during the last ~8 ka to its current position. The ICE-5G glaciation-deglaciation history includes a readvance between the latitudes of 62°N and 72°N. The GPS measurements suggest the ICE-5G readvance may be too large or mistimed. Our GPS results at Qaqortoq, located at the southern tip of Greenland, suggest a secular subsidence rate of ????0.3 ± 1.1 mm/a, while ICE-5G predicts an uplift rate of 1.0 mm/a. ICE-5G assumes no ice sheet readvance in south Greenland, including no readvance of the Qassimiut lobe. The difference of 1.3 ± 1.1 mm/a can tentatively be explained as due to a ~33 km readvance of the Qassimiut lobe during the last ~3 ka. For the other GPS sites, the observed/predicted uplift rates are 3.6 ± 1.1/-0.1 mm/a at Thule, 0.0 ± 1.1/2.0 mm/a at Scoresbysund, and -0.4 ± 1.1/-1.7 mm/a at Kulusuk. For Thule, Kulusuk, and Scoresbysund the differences between the observed and predicted rates are on the order of 1.3 – 3.7 mm/a, though with opposite signs, and indicate that ICE-5G does not exactly reproduce the correct rebound signal at those locations. |
format |
Article in Journal/Newspaper |
author |
Khan, S. A. Wahr, J. Leuliette, E. van Dam, Tonie Larson, K. M. Francis, Olivier |
author_facet |
Khan, S. A. Wahr, J. Leuliette, E. van Dam, Tonie Larson, K. M. Francis, Olivier |
author_sort |
Khan, S. A. |
title |
Geodetic measurements of postglacial adjustments in Greenland |
title_short |
Geodetic measurements of postglacial adjustments in Greenland |
title_full |
Geodetic measurements of postglacial adjustments in Greenland |
title_fullStr |
Geodetic measurements of postglacial adjustments in Greenland |
title_full_unstemmed |
Geodetic measurements of postglacial adjustments in Greenland |
title_sort |
geodetic measurements of postglacial adjustments in greenland |
publisher |
American Geophysical Union (AGU) |
publishDate |
2008 |
url |
https://orbilu.uni.lu/handle/10993/653 https://doi.org/10.1029/2007JB004956 |
genre |
Greenland Ice Sheet Kulusuk Nuuk Qaqortoq Qassimiut Scoresbysund Thule |
genre_facet |
Greenland Ice Sheet Kulusuk Nuuk Qaqortoq Qassimiut Scoresbysund Thule |
op_source |
Journal of Geophysical Research (2008) |
op_relation |
urn:issn:2156-2202 https://orbilu.uni.lu/handle/10993/653 info:hdl:10993/653 doi:10.1029/2007JB004956 scopus-id:2-s2.0-42149089217 wos:000253236400001 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2007JB004956 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
113 |
container_issue |
B2 |
_version_ |
1796943093767864320 |