A Method for Determining Ice-Thickness Change at Remote Locations using GPS
Ice-thickness changes at remote locations on ice sheets can be determined by means of precise Global Positioning System (GPS) surveys with interferometric solutions. Remote sites are precisely surveyed relative to GPS receivers on rock. Repeat observations of the position of a remote site provide it...
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ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1007 2023-05-15T16:40:50+02:00 A Method for Determining Ice-Thickness Change at Remote Locations using GPS Hulbe, Christina L. Whillans, I. M. 1994-01-01T08:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geology_fac/8 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1007&context=geology_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geology_fac/8 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1007&context=geology_fac Geology Faculty Publications and Presentations Ice sheets -- Mathematical models Glaciology -- Polar regions Ice -- Remote sensing Geology text 1994 ftportlandstate 2022-01-09T19:24:25Z Ice-thickness changes at remote locations on ice sheets can be determined by means of precise Global Positioning System (GPS) surveys with interferometric solutions. Remote sites are precisely surveyed relative to GPS receivers on rock. Repeat observations of the position of a remote site provide its vertical velocity. The difference between this velocity and accumulation rate is an indicator of change in ice-sheet thickness. Allowance must be made for the movement of survey markers due to firn compaction and down-slope ice motion, To allow for firn compaction, very long- poles arc placed to a sufficient depth in the firn that the densification rate can be considered steady. This assumption may be tested by measurements with poles set to different depths. An analysis of errors in pilot studies indicates that the limit to precision is the determination of accumulation rate. Text Ice Sheet Portland State University: PDXScholar |
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Portland State University: PDXScholar |
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ftportlandstate |
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unknown |
topic |
Ice sheets -- Mathematical models Glaciology -- Polar regions Ice -- Remote sensing Geology |
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Ice sheets -- Mathematical models Glaciology -- Polar regions Ice -- Remote sensing Geology Hulbe, Christina L. Whillans, I. M. A Method for Determining Ice-Thickness Change at Remote Locations using GPS |
topic_facet |
Ice sheets -- Mathematical models Glaciology -- Polar regions Ice -- Remote sensing Geology |
description |
Ice-thickness changes at remote locations on ice sheets can be determined by means of precise Global Positioning System (GPS) surveys with interferometric solutions. Remote sites are precisely surveyed relative to GPS receivers on rock. Repeat observations of the position of a remote site provide its vertical velocity. The difference between this velocity and accumulation rate is an indicator of change in ice-sheet thickness. Allowance must be made for the movement of survey markers due to firn compaction and down-slope ice motion, To allow for firn compaction, very long- poles arc placed to a sufficient depth in the firn that the densification rate can be considered steady. This assumption may be tested by measurements with poles set to different depths. An analysis of errors in pilot studies indicates that the limit to precision is the determination of accumulation rate. |
format |
Text |
author |
Hulbe, Christina L. Whillans, I. M. |
author_facet |
Hulbe, Christina L. Whillans, I. M. |
author_sort |
Hulbe, Christina L. |
title |
A Method for Determining Ice-Thickness Change at Remote Locations using GPS |
title_short |
A Method for Determining Ice-Thickness Change at Remote Locations using GPS |
title_full |
A Method for Determining Ice-Thickness Change at Remote Locations using GPS |
title_fullStr |
A Method for Determining Ice-Thickness Change at Remote Locations using GPS |
title_full_unstemmed |
A Method for Determining Ice-Thickness Change at Remote Locations using GPS |
title_sort |
method for determining ice-thickness change at remote locations using gps |
publisher |
PDXScholar |
publishDate |
1994 |
url |
https://pdxscholar.library.pdx.edu/geology_fac/8 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1007&context=geology_fac |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geology Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geology_fac/8 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1007&context=geology_fac |
_version_ |
1766031252354236416 |