Mass balance assessment using GPS
Mass balance is an integral part of any comprehensive glaciological investigation. Unfortunately, it is hard to determine at remote locations where there is no fixed reference. The Global Positioning System (GPS) offers a solution. Simultaneous GPS observations at a known location and the remote fie...
Main Author: | |
---|---|
Format: | Other/Unknown Material |
Language: | unknown |
Published: |
1993
|
Subjects: | |
Online Access: | http://ntrs.nasa.gov/search.jsp?R=19930022703 |
id |
ftnasantrs:oai:casi.ntrs.nasa.gov:19930022703 |
---|---|
record_format |
openpolar |
spelling |
ftnasantrs:oai:casi.ntrs.nasa.gov:19930022703 2023-05-15T14:04:19+02:00 Mass balance assessment using GPS Hulbe, Christina L. Unclassified, Unlimited, Publicly available Jul 1, 1993 http://ntrs.nasa.gov/search.jsp?R=19930022703 unknown http://ntrs.nasa.gov/search.jsp?R=19930022703 Accession ID: 93N31892 No Copyright Other Sources 46 NASA. Goddard Space Flight Center, The First Annual West Antarctic Ice Sheet (WAIS) Science Workshop; p 24 1993 ftnasantrs 2012-02-15T19:56:21Z Mass balance is an integral part of any comprehensive glaciological investigation. Unfortunately, it is hard to determine at remote locations where there is no fixed reference. The Global Positioning System (GPS) offers a solution. Simultaneous GPS observations at a known location and the remote field site, processed differentially, will accurately position the camp site. From there, a monument planted in the firn atop the ice can also be accurately positioned. Change in the monument's vertical position is a direct indicator of ice thickness change. Because the monument is not connected to the ice, its motion is due to both mass balance change and to the settling of firn as it densifies into ice. Observations of relative position change between the monument and anchors at various depths within the firn are used to remove the settling effect. An experiment to test this method has begun at Byrd Station on the West Antarctic Ice Sheet and the first epoch of observations was made. Analysis indicates that positioning errors will be very small. It appears likely that the largest errors involved with this technique will arise from ancillary data needed to determine firn settling. Other/Unknown Material Antarc* Antarctic Ice Sheet NASA Technical Reports Server (NTRS) Antarctic West Antarctic Ice Sheet Byrd Byrd Station ENVELOPE(-119.533,-119.533,-80.017,-80.017) The Monument ENVELOPE(162.250,162.250,-72.583,-72.583) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
46 |
spellingShingle |
46 Hulbe, Christina L. Mass balance assessment using GPS |
topic_facet |
46 |
description |
Mass balance is an integral part of any comprehensive glaciological investigation. Unfortunately, it is hard to determine at remote locations where there is no fixed reference. The Global Positioning System (GPS) offers a solution. Simultaneous GPS observations at a known location and the remote field site, processed differentially, will accurately position the camp site. From there, a monument planted in the firn atop the ice can also be accurately positioned. Change in the monument's vertical position is a direct indicator of ice thickness change. Because the monument is not connected to the ice, its motion is due to both mass balance change and to the settling of firn as it densifies into ice. Observations of relative position change between the monument and anchors at various depths within the firn are used to remove the settling effect. An experiment to test this method has begun at Byrd Station on the West Antarctic Ice Sheet and the first epoch of observations was made. Analysis indicates that positioning errors will be very small. It appears likely that the largest errors involved with this technique will arise from ancillary data needed to determine firn settling. |
format |
Other/Unknown Material |
author |
Hulbe, Christina L. |
author_facet |
Hulbe, Christina L. |
author_sort |
Hulbe, Christina L. |
title |
Mass balance assessment using GPS |
title_short |
Mass balance assessment using GPS |
title_full |
Mass balance assessment using GPS |
title_fullStr |
Mass balance assessment using GPS |
title_full_unstemmed |
Mass balance assessment using GPS |
title_sort |
mass balance assessment using gps |
publishDate |
1993 |
url |
http://ntrs.nasa.gov/search.jsp?R=19930022703 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-119.533,-119.533,-80.017,-80.017) ENVELOPE(162.250,162.250,-72.583,-72.583) |
geographic |
Antarctic West Antarctic Ice Sheet Byrd Byrd Station The Monument |
geographic_facet |
Antarctic West Antarctic Ice Sheet Byrd Byrd Station The Monument |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19930022703 Accession ID: 93N31892 |
op_rights |
No Copyright |
_version_ |
1766275351826137088 |