Geodetic measurements in Greenland and their implications
peer reviewed We describe results from an ongoing experiment in Greenland, in which we are using absolute gravity and continuous Global Positioning System (GPS) measurements to study vertical crustal motion at two locations along the edge of the ice sheet: Kellyville, located about one third of the...
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2001
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ftunivluxembourg:oai:orbilu.uni.lu:10993/762 2024-04-21T08:03:19+00:00 Geodetic measurements in Greenland and their implications Wahr, John van Dam, Tonie Larson, Kristine Francis, Olivier 2001 https://orbilu.uni.lu/handle/10993/762 https://doi.org/10.1029/2001JB000211 en eng American Geophysical Union urn:issn:2156-2202 https://orbilu.uni.lu/handle/10993/762 info:hdl:10993/762 doi:10.1029/2001JB000211 scopus-id:2-s2.0-0034803480 wos:000170365200033 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Journal of Geophysical Research, 106 (B8), 16567-16581 (2001) Greenland present-day ice mass changes GPS absolute gravity 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 2001 ftunivluxembourg https://doi.org/10.1029/2001JB000211 2024-03-27T14:10:06Z peer reviewed We describe results from an ongoing experiment in Greenland, in which we are using absolute gravity and continuous Global Positioning System (GPS) measurements to study vertical crustal motion at two locations along the edge of the ice sheet: Kellyville, located about one third of the way up the western ice margin, and Kulusuk, located along the eastern ice margin at about the same latitude as Kellyville. The GPS measurements suggest average crustal uplift rates of -5.8±1.0 mm/yr at Kellyville and -2.1±1.5 mm/yr at Kulusuk. There have not yet been enough absolute gravity occupations to permit useful secular gravity solutions at either location. The negative uplift rate at Kellyville is consistent with independent archeological and historical evidence that the southwestern edge of the continent has been subsiding over the last 3000 years, but it is inconsistent with estimates of the Earth's continuing viscoelastic response to melting ice during the early Holocene, which predict that Kellyville is likely to be uplifting, rather than subsiding, by 2.0±3.5 mm/yr. The resulting -7.8±3.6 mm/yr discrepancy between the observed and predicted uplift rates is too large to be caused by loading from present-day changes in nearby ice. However, it is consistent with independent suggestions that the western ice sheet margin in this region may have advanced by ≈50 km during the past 3000-4000 years. If this advance did occur and if the crustal subsidence it induces is not removed from altimeter measurements of Greenland ice sheet elevations, then the altimeter solutions could underestimate the true snow/ice thickness change by 5-10 mm/yr along portions of the western margin of the ice sheet. Article in Journal/Newspaper Greenland Ice Sheet Kulusuk University of Luxembourg: ORBilu - Open Repository and Bibliography Journal of Geophysical Research: Solid Earth 106 B8 16567 16581 |
institution |
Open Polar |
collection |
University of Luxembourg: ORBilu - Open Repository and Bibliography |
op_collection_id |
ftunivluxembourg |
language |
English |
topic |
Greenland present-day ice mass changes GPS absolute gravity Physical chemical mathematical & earth Sciences Physics Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Greenland present-day ice mass changes GPS absolute gravity Physical chemical mathematical & earth Sciences Physics Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Wahr, John van Dam, Tonie Larson, Kristine Francis, Olivier Geodetic measurements in Greenland and their implications |
topic_facet |
Greenland present-day ice mass changes GPS absolute gravity 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 describe results from an ongoing experiment in Greenland, in which we are using absolute gravity and continuous Global Positioning System (GPS) measurements to study vertical crustal motion at two locations along the edge of the ice sheet: Kellyville, located about one third of the way up the western ice margin, and Kulusuk, located along the eastern ice margin at about the same latitude as Kellyville. The GPS measurements suggest average crustal uplift rates of -5.8±1.0 mm/yr at Kellyville and -2.1±1.5 mm/yr at Kulusuk. There have not yet been enough absolute gravity occupations to permit useful secular gravity solutions at either location. The negative uplift rate at Kellyville is consistent with independent archeological and historical evidence that the southwestern edge of the continent has been subsiding over the last 3000 years, but it is inconsistent with estimates of the Earth's continuing viscoelastic response to melting ice during the early Holocene, which predict that Kellyville is likely to be uplifting, rather than subsiding, by 2.0±3.5 mm/yr. The resulting -7.8±3.6 mm/yr discrepancy between the observed and predicted uplift rates is too large to be caused by loading from present-day changes in nearby ice. However, it is consistent with independent suggestions that the western ice sheet margin in this region may have advanced by ≈50 km during the past 3000-4000 years. If this advance did occur and if the crustal subsidence it induces is not removed from altimeter measurements of Greenland ice sheet elevations, then the altimeter solutions could underestimate the true snow/ice thickness change by 5-10 mm/yr along portions of the western margin of the ice sheet. |
format |
Article in Journal/Newspaper |
author |
Wahr, John van Dam, Tonie Larson, Kristine Francis, Olivier |
author_facet |
Wahr, John van Dam, Tonie Larson, Kristine Francis, Olivier |
author_sort |
Wahr, John |
title |
Geodetic measurements in Greenland and their implications |
title_short |
Geodetic measurements in Greenland and their implications |
title_full |
Geodetic measurements in Greenland and their implications |
title_fullStr |
Geodetic measurements in Greenland and their implications |
title_full_unstemmed |
Geodetic measurements in Greenland and their implications |
title_sort |
geodetic measurements in greenland and their implications |
publisher |
American Geophysical Union |
publishDate |
2001 |
url |
https://orbilu.uni.lu/handle/10993/762 https://doi.org/10.1029/2001JB000211 |
genre |
Greenland Ice Sheet Kulusuk |
genre_facet |
Greenland Ice Sheet Kulusuk |
op_source |
Journal of Geophysical Research, 106 (B8), 16567-16581 (2001) |
op_relation |
urn:issn:2156-2202 https://orbilu.uni.lu/handle/10993/762 info:hdl:10993/762 doi:10.1029/2001JB000211 scopus-id:2-s2.0-0034803480 wos:000170365200033 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2001JB000211 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
106 |
container_issue |
B8 |
container_start_page |
16567 |
op_container_end_page |
16581 |
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1796943226410631168 |