Crystal Alignments in the Fast Ice of Arctic Alaska
Field observations at 60 sites located in the fast or near-fast ice along a 1200-km stretch of the north coast of Alaska between Bering Strait and Barter Island have shown that the great majority of the ice samples (95%) exhibit striking c-axis alignments within the horizontal plane. Such alignments...
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ftdtic:ADA077188 2023-05-15T15:08:56+02:00 Crystal Alignments in the Fast Ice of Arctic Alaska Weeks ,W F Gow,A J COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 1979-10 text/html http://www.dtic.mil/docs/citations/ADA077188 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA077188 en eng http://www.dtic.mil/docs/citations/ADA077188 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Crystallography *CRYSTAL GROWTH *SEA ICE ALASKA HISTOGRAMS STANDARD DEVIATION COLD WEATHER TESTS CHUKCHI SEA BARTER ISLAND PACK ICE Text 1979 ftdtic 2016-02-20T17:10:21Z Field observations at 60 sites located in the fast or near-fast ice along a 1200-km stretch of the north coast of Alaska between Bering Strait and Barter Island have shown that the great majority of the ice samples (95%) exhibit striking c-axis alignments within the horizontal plane. Such alignments were usually well developed by the time the ice was 50 cm thick and in some cases when the ice was 20 cm thick. In all cases the degree of preferred orientation increased with depth in the ice. Representative standard deviations around a mean direction in the horizontal plane are commonly less than + or - 10 deg. for samples collected near the bottom of the ice. The general patterns of the alignments support a correlation between the preferred c-axis direction and the current direction at the ice/water interface. A comparison between c-axis alignments and spot current mesaurements made at 42 locations shows that the most frequent current direction coincides with the mean c-axis direction. Such alignments are believed to be the result of geometric selection with the most favored orientation being that in which the current flows normal to the (0001) plates of ice that compose the dendritic sea ice/sea ater interface. (Author) Text Arctic Barter Island Bering Strait Chukchi Chukchi Sea Ice permafrost Sea ice Alaska Defense Technical Information Center: DTIC Technical Reports database Arctic Bering Strait Chukchi Sea |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Crystallography *CRYSTAL GROWTH *SEA ICE ALASKA HISTOGRAMS STANDARD DEVIATION COLD WEATHER TESTS CHUKCHI SEA BARTER ISLAND PACK ICE |
spellingShingle |
Snow Ice and Permafrost Crystallography *CRYSTAL GROWTH *SEA ICE ALASKA HISTOGRAMS STANDARD DEVIATION COLD WEATHER TESTS CHUKCHI SEA BARTER ISLAND PACK ICE Weeks ,W F Gow,A J Crystal Alignments in the Fast Ice of Arctic Alaska |
topic_facet |
Snow Ice and Permafrost Crystallography *CRYSTAL GROWTH *SEA ICE ALASKA HISTOGRAMS STANDARD DEVIATION COLD WEATHER TESTS CHUKCHI SEA BARTER ISLAND PACK ICE |
description |
Field observations at 60 sites located in the fast or near-fast ice along a 1200-km stretch of the north coast of Alaska between Bering Strait and Barter Island have shown that the great majority of the ice samples (95%) exhibit striking c-axis alignments within the horizontal plane. Such alignments were usually well developed by the time the ice was 50 cm thick and in some cases when the ice was 20 cm thick. In all cases the degree of preferred orientation increased with depth in the ice. Representative standard deviations around a mean direction in the horizontal plane are commonly less than + or - 10 deg. for samples collected near the bottom of the ice. The general patterns of the alignments support a correlation between the preferred c-axis direction and the current direction at the ice/water interface. A comparison between c-axis alignments and spot current mesaurements made at 42 locations shows that the most frequent current direction coincides with the mean c-axis direction. Such alignments are believed to be the result of geometric selection with the most favored orientation being that in which the current flows normal to the (0001) plates of ice that compose the dendritic sea ice/sea ater interface. (Author) |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
Weeks ,W F Gow,A J |
author_facet |
Weeks ,W F Gow,A J |
author_sort |
Weeks ,W F |
title |
Crystal Alignments in the Fast Ice of Arctic Alaska |
title_short |
Crystal Alignments in the Fast Ice of Arctic Alaska |
title_full |
Crystal Alignments in the Fast Ice of Arctic Alaska |
title_fullStr |
Crystal Alignments in the Fast Ice of Arctic Alaska |
title_full_unstemmed |
Crystal Alignments in the Fast Ice of Arctic Alaska |
title_sort |
crystal alignments in the fast ice of arctic alaska |
publishDate |
1979 |
url |
http://www.dtic.mil/docs/citations/ADA077188 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA077188 |
geographic |
Arctic Bering Strait Chukchi Sea |
geographic_facet |
Arctic Bering Strait Chukchi Sea |
genre |
Arctic Barter Island Bering Strait Chukchi Chukchi Sea Ice permafrost Sea ice Alaska |
genre_facet |
Arctic Barter Island Bering Strait Chukchi Chukchi Sea Ice permafrost Sea ice Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA077188 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
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1766340199980204032 |