The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland
We describe how GPS measurements of horizontal crustal motion can be used to augment vertical crustal motion measurements, to improve and extend GPS studies of surface loading. We show that the ratio of the vertical displacement to the horizontal displacement, combined with the direction of the hori...
Published in: | Journal of Geophysical Research: Solid Earth |
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Language: | English |
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Online Access: | https://orbit.dtu.dk/en/publications/2cb75dca-0dd6-4ce6-b14f-35479a054f07 https://doi.org/10.1002/jgrb.50104 |
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ftdtupubl:oai:pure.atira.dk:publications/2cb75dca-0dd6-4ce6-b14f-35479a054f07 2024-09-15T18:07:39+00:00 The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland Wahr, John Khan, Shfaqat Abbas van Dam, Tonie Lui, Lin van Angelen, Jan H. van den Broeke, Michiel R. Meertens, Charles M. 2013 https://orbit.dtu.dk/en/publications/2cb75dca-0dd6-4ce6-b14f-35479a054f07 https://doi.org/10.1002/jgrb.50104 eng eng https://orbit.dtu.dk/en/publications/2cb75dca-0dd6-4ce6-b14f-35479a054f07 info:eu-repo/semantics/closedAccess Wahr , J , Khan , S A , van Dam , T , Lui , L , van Angelen , J H , van den Broeke , M R & Meertens , C M 2013 , ' The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland ' , Journal of Geophysical Research: Atmospheres , vol. 118 , no. 4 , pp. 1795-1806 . https://doi.org/10.1002/jgrb.50104 GPS Loading Greenland article 2013 ftdtupubl https://doi.org/10.1002/jgrb.50104 2024-07-29T23:50:17Z We describe how GPS measurements of horizontal crustal motion can be used to augment vertical crustal motion measurements, to improve and extend GPS studies of surface loading. We show that the ratio of the vertical displacement to the horizontal displacement, combined with the direction of the horizontal motion, can help determine whether nearby loading is concentrated in a small region (for example, in a single lake or glacier), and where that region is. We illustrate this method by applying it to two specific cases: an analysis of GPS data from northern California to monitor the level of Lake Shasta, and the analysis of data from a single GPS site in southeast Greenland to determine mass variability of two large, nearby outlet glaciers: Helheim Glacier and Midgaard Glacier. The California example serves largely as a proof-of-concept, where the results can be assessed by comparing with independent observations (Lake Shasta tide gauge data, in this case). Our Greenland results show that both Helheim and Midgaard have experienced notable interannual variations in mass loss rate over the last decade. Helheim's mass loss accelerated rapidly in mid-2003, decelerated in late 2005, and increased again in 2008–2009 before returning to about its pre-2003 rate in late 2010. Midgaard's mass loss accelerated in mid-2004, and remained more-or-less constant before returning to its pre-2003 rate in late 2008. Article in Journal/Newspaper glacier Greenland Technical University of Denmark: DTU Orbit Journal of Geophysical Research: Solid Earth 118 4 1795 1806 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
GPS Loading Greenland |
spellingShingle |
GPS Loading Greenland Wahr, John Khan, Shfaqat Abbas van Dam, Tonie Lui, Lin van Angelen, Jan H. van den Broeke, Michiel R. Meertens, Charles M. The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland |
topic_facet |
GPS Loading Greenland |
description |
We describe how GPS measurements of horizontal crustal motion can be used to augment vertical crustal motion measurements, to improve and extend GPS studies of surface loading. We show that the ratio of the vertical displacement to the horizontal displacement, combined with the direction of the horizontal motion, can help determine whether nearby loading is concentrated in a small region (for example, in a single lake or glacier), and where that region is. We illustrate this method by applying it to two specific cases: an analysis of GPS data from northern California to monitor the level of Lake Shasta, and the analysis of data from a single GPS site in southeast Greenland to determine mass variability of two large, nearby outlet glaciers: Helheim Glacier and Midgaard Glacier. The California example serves largely as a proof-of-concept, where the results can be assessed by comparing with independent observations (Lake Shasta tide gauge data, in this case). Our Greenland results show that both Helheim and Midgaard have experienced notable interannual variations in mass loss rate over the last decade. Helheim's mass loss accelerated rapidly in mid-2003, decelerated in late 2005, and increased again in 2008–2009 before returning to about its pre-2003 rate in late 2010. Midgaard's mass loss accelerated in mid-2004, and remained more-or-less constant before returning to its pre-2003 rate in late 2008. |
format |
Article in Journal/Newspaper |
author |
Wahr, John Khan, Shfaqat Abbas van Dam, Tonie Lui, Lin van Angelen, Jan H. van den Broeke, Michiel R. Meertens, Charles M. |
author_facet |
Wahr, John Khan, Shfaqat Abbas van Dam, Tonie Lui, Lin van Angelen, Jan H. van den Broeke, Michiel R. Meertens, Charles M. |
author_sort |
Wahr, John |
title |
The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland |
title_short |
The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland |
title_full |
The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland |
title_fullStr |
The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland |
title_full_unstemmed |
The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland |
title_sort |
use of gps horizontals for loading studies, with applications to northern california and southeast greenland |
publishDate |
2013 |
url |
https://orbit.dtu.dk/en/publications/2cb75dca-0dd6-4ce6-b14f-35479a054f07 https://doi.org/10.1002/jgrb.50104 |
genre |
glacier Greenland |
genre_facet |
glacier Greenland |
op_source |
Wahr , J , Khan , S A , van Dam , T , Lui , L , van Angelen , J H , van den Broeke , M R & Meertens , C M 2013 , ' The use of GPS horizontals for loading studies, with applications to northern California and southeast Greenland ' , Journal of Geophysical Research: Atmospheres , vol. 118 , no. 4 , pp. 1795-1806 . https://doi.org/10.1002/jgrb.50104 |
op_relation |
https://orbit.dtu.dk/en/publications/2cb75dca-0dd6-4ce6-b14f-35479a054f07 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1002/jgrb.50104 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
118 |
container_issue |
4 |
container_start_page |
1795 |
op_container_end_page |
1806 |
_version_ |
1810445034416242688 |