Isotropic Points on Glaciers
Abstract Two isotropic points measured by Meier and others (1985) on Columbia Glacier, Alaska, are examined. The pattern classification of the upper one is on the borderline between monstar and lemon, and this is traced to the fact that the variation of strain-rate in the longitudinal direction is a...
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Cambridge University Press (CUP)
1986
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Online Access: | http://dx.doi.org/10.1017/s0022143000012041 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012041 |
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crcambridgeupr:10.1017/s0022143000012041 2024-03-03T08:44:34+00:00 Isotropic Points on Glaciers Nye, J. F. 1986 http://dx.doi.org/10.1017/s0022143000012041 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012041 en eng Cambridge University Press (CUP) Journal of Glaciology volume 32, issue 112, page 363-365 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1986 crcambridgeupr https://doi.org/10.1017/s0022143000012041 2024-02-08T08:47:47Z Abstract Two isotropic points measured by Meier and others (1985) on Columbia Glacier, Alaska, are examined. The pattern classification of the upper one is on the borderline between monstar and lemon, and this is traced to the fact that the variation of strain-rate in the longitudinal direction is approximately equal to that in the transverse direction, contrary to the assumption made in Nye (1983). The conditions for the lower isotropic point to have the star pattern, as observed, are believed to be typical for a glacier that ends in an ice cliff, like this one, which calves icebergs. Where, as in this case, there is only a small transverse velocity, the isotropic points on a glacier must nearly coincide with stationary points for the speed, and these are almost always either maxima or saddles, alternating. The maxima correspond to lemon or monstar patterns, and the saddles to star patterns. Article in Journal/Newspaper glacier glaciers Journal of Glaciology Alaska Cambridge University Press Meier ENVELOPE(-45.900,-45.900,-60.633,-60.633) Journal of Glaciology 32 112 363 365 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Nye, J. F. Isotropic Points on Glaciers |
topic_facet |
Earth-Surface Processes |
description |
Abstract Two isotropic points measured by Meier and others (1985) on Columbia Glacier, Alaska, are examined. The pattern classification of the upper one is on the borderline between monstar and lemon, and this is traced to the fact that the variation of strain-rate in the longitudinal direction is approximately equal to that in the transverse direction, contrary to the assumption made in Nye (1983). The conditions for the lower isotropic point to have the star pattern, as observed, are believed to be typical for a glacier that ends in an ice cliff, like this one, which calves icebergs. Where, as in this case, there is only a small transverse velocity, the isotropic points on a glacier must nearly coincide with stationary points for the speed, and these are almost always either maxima or saddles, alternating. The maxima correspond to lemon or monstar patterns, and the saddles to star patterns. |
format |
Article in Journal/Newspaper |
author |
Nye, J. F. |
author_facet |
Nye, J. F. |
author_sort |
Nye, J. F. |
title |
Isotropic Points on Glaciers |
title_short |
Isotropic Points on Glaciers |
title_full |
Isotropic Points on Glaciers |
title_fullStr |
Isotropic Points on Glaciers |
title_full_unstemmed |
Isotropic Points on Glaciers |
title_sort |
isotropic points on glaciers |
publisher |
Cambridge University Press (CUP) |
publishDate |
1986 |
url |
http://dx.doi.org/10.1017/s0022143000012041 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012041 |
long_lat |
ENVELOPE(-45.900,-45.900,-60.633,-60.633) |
geographic |
Meier |
geographic_facet |
Meier |
genre |
glacier glaciers Journal of Glaciology Alaska |
genre_facet |
glacier glaciers Journal of Glaciology Alaska |
op_source |
Journal of Glaciology volume 32, issue 112, page 363-365 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000012041 |
container_title |
Journal of Glaciology |
container_volume |
32 |
container_issue |
112 |
container_start_page |
363 |
op_container_end_page |
365 |
_version_ |
1792500062203412480 |