Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements
The displacement of the surface of an ice sheet and of markers set in its top layers can be measured geodetically, and also, it is expected, by radio-echo methods. The paper discusses how such measurements could be interpreted as showing long-term changes in the thickness of the ice sheet; in partic...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1975
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0022143000013381 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000013381 |
id |
crcambridgeupr:10.1017/s0022143000013381 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0022143000013381 2024-03-03T08:45:02+00:00 Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements Nye, J. F. Wills, H. H. 1975 http://dx.doi.org/10.1017/s0022143000013381 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000013381 en eng Cambridge University Press (CUP) Journal of Glaciology volume 14, issue 70, page 49-56 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1975 crcambridgeupr https://doi.org/10.1017/s0022143000013381 2024-02-08T08:38:15Z The displacement of the surface of an ice sheet and of markers set in its top layers can be measured geodetically, and also, it is expected, by radio-echo methods. The paper discusses how such measurements could be interpreted as showing long-term changes in the thickness of the ice sheet; in particular it discusses how one might design an experiment so as to avoid unwanted effects due to short-term changes in rate of accumulation. The analysis is similar to that of Federer and others (1970), but it corrects an error, so that when applied to their results for central Greenland it gives a different result for the lowering of the surface. Federer and others have already concluded that the average accumulation rates during the past 100 years have been below those needed to keep in balance with the velocity of the ice sheet as a whole. Using a particular model, it is found that this has resulted in the surface lowering at a mean rate of 0.050 m a −1 between 1871 and 1968, and a mean rate of 0.140 m a −1 between 1959 and 1968. Article in Journal/Newspaper Greenland Ice Sheet Journal of Glaciology Cambridge University Press Greenland Journal of Glaciology 14 70 49 56 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Nye, J. F. Wills, H. H. Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements |
topic_facet |
Earth-Surface Processes |
description |
The displacement of the surface of an ice sheet and of markers set in its top layers can be measured geodetically, and also, it is expected, by radio-echo methods. The paper discusses how such measurements could be interpreted as showing long-term changes in the thickness of the ice sheet; in particular it discusses how one might design an experiment so as to avoid unwanted effects due to short-term changes in rate of accumulation. The analysis is similar to that of Federer and others (1970), but it corrects an error, so that when applied to their results for central Greenland it gives a different result for the lowering of the surface. Federer and others have already concluded that the average accumulation rates during the past 100 years have been below those needed to keep in balance with the velocity of the ice sheet as a whole. Using a particular model, it is found that this has resulted in the surface lowering at a mean rate of 0.050 m a −1 between 1871 and 1968, and a mean rate of 0.140 m a −1 between 1959 and 1968. |
format |
Article in Journal/Newspaper |
author |
Nye, J. F. Wills, H. H. |
author_facet |
Nye, J. F. Wills, H. H. |
author_sort |
Nye, J. F. |
title |
Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements |
title_short |
Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements |
title_full |
Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements |
title_fullStr |
Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements |
title_full_unstemmed |
Deducing Thickness Changes Of An Ice Sheet From Radio-Echo And Other Measurements |
title_sort |
deducing thickness changes of an ice sheet from radio-echo and other measurements |
publisher |
Cambridge University Press (CUP) |
publishDate |
1975 |
url |
http://dx.doi.org/10.1017/s0022143000013381 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000013381 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Journal of Glaciology |
genre_facet |
Greenland Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 14, issue 70, page 49-56 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000013381 |
container_title |
Journal of Glaciology |
container_volume |
14 |
container_issue |
70 |
container_start_page |
49 |
op_container_end_page |
56 |
_version_ |
1792500543654985728 |