Vertical strain-rate measurements in an arctic ice cap and gerductions freom them
Abstract Closely spaced measurements of diameter of thermally drilled bore holes reveal a pattern of small variations. These patterns serve to igerntify points on the bore-hole wall; thus the change in length of sections of bore hole can be gertermined as a function of time. This method has been use...
Published in: | Journal of Glaciology |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1976
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0022143000030665 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030665 |
id |
crcambridgeupr:10.1017/s0022143000030665 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0022143000030665 2024-03-03T08:42:06+00:00 Vertical strain-rate measurements in an arctic ice cap and gerductions freom them Paterson, W. S. B. 1976 http://dx.doi.org/10.1017/s0022143000030665 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030665 en eng Cambridge University Press (CUP) Journal of Glaciology volume 17, issue 75, page 3-12 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1976 crcambridgeupr https://doi.org/10.1017/s0022143000030665 2024-02-08T08:36:11Z Abstract Closely spaced measurements of diameter of thermally drilled bore holes reveal a pattern of small variations. These patterns serve to igerntify points on the bore-hole wall; thus the change in length of sections of bore hole can be gertermined as a function of time. This method has been used to measure vertical strain-rate as a function of gerpth in two bore holes near the crest of the Devon Island ice cap. The measured strain-rate, corrected for firn compaction, varies significantly with gerpth. The vertical component of velocity at the surface was gertermined freom the contraction rate of a bore hole that penetrated to the base of the ice. Comparison of this velocity with the present accumulation rate suggests that the ice cap, in the vicinity of the bore hole, is thickening slightly at present. The age of the ice at various gerpths, as calculated freom the measured vertical velocities, is in broad agreement with radio-carbon dates covering the past 6 000 years. This suggests that the flow of the ice cap has not varied significantly over this period, and thus that the present accumulation rate, which is causing thickening, is slightly above the average for the period. Article in Journal/Newspaper Arctic Devon Island Ice cap Journal of Glaciology Cambridge University Press Arctic Devon Island ENVELOPE(-88.000,-88.000,75.252,75.252) Journal of Glaciology 17 75 3 12 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Paterson, W. S. B. Vertical strain-rate measurements in an arctic ice cap and gerductions freom them |
topic_facet |
Earth-Surface Processes |
description |
Abstract Closely spaced measurements of diameter of thermally drilled bore holes reveal a pattern of small variations. These patterns serve to igerntify points on the bore-hole wall; thus the change in length of sections of bore hole can be gertermined as a function of time. This method has been used to measure vertical strain-rate as a function of gerpth in two bore holes near the crest of the Devon Island ice cap. The measured strain-rate, corrected for firn compaction, varies significantly with gerpth. The vertical component of velocity at the surface was gertermined freom the contraction rate of a bore hole that penetrated to the base of the ice. Comparison of this velocity with the present accumulation rate suggests that the ice cap, in the vicinity of the bore hole, is thickening slightly at present. The age of the ice at various gerpths, as calculated freom the measured vertical velocities, is in broad agreement with radio-carbon dates covering the past 6 000 years. This suggests that the flow of the ice cap has not varied significantly over this period, and thus that the present accumulation rate, which is causing thickening, is slightly above the average for the period. |
format |
Article in Journal/Newspaper |
author |
Paterson, W. S. B. |
author_facet |
Paterson, W. S. B. |
author_sort |
Paterson, W. S. B. |
title |
Vertical strain-rate measurements in an arctic ice cap and gerductions freom them |
title_short |
Vertical strain-rate measurements in an arctic ice cap and gerductions freom them |
title_full |
Vertical strain-rate measurements in an arctic ice cap and gerductions freom them |
title_fullStr |
Vertical strain-rate measurements in an arctic ice cap and gerductions freom them |
title_full_unstemmed |
Vertical strain-rate measurements in an arctic ice cap and gerductions freom them |
title_sort |
vertical strain-rate measurements in an arctic ice cap and gerductions freom them |
publisher |
Cambridge University Press (CUP) |
publishDate |
1976 |
url |
http://dx.doi.org/10.1017/s0022143000030665 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030665 |
long_lat |
ENVELOPE(-88.000,-88.000,75.252,75.252) |
geographic |
Arctic Devon Island |
geographic_facet |
Arctic Devon Island |
genre |
Arctic Devon Island Ice cap Journal of Glaciology |
genre_facet |
Arctic Devon Island Ice cap Journal of Glaciology |
op_source |
Journal of Glaciology volume 17, issue 75, page 3-12 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000030665 |
container_title |
Journal of Glaciology |
container_volume |
17 |
container_issue |
75 |
container_start_page |
3 |
op_container_end_page |
12 |
_version_ |
1792497600360873984 |