Thickness and Roughness Variations of Arctic Multiyear Sea Ice
Three surface elevation and ice thickness profiles obtained during the 1972 Arctic Ice Dynamics Joint Experiment on a multiyear ice floe were analyzed to obtain relationships between surface elevation, thickness and physical properties of the ice. It was found that for ice freeboards from 0.10 m to...
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ftdtic:ADA028086 2023-05-15T14:54:49+02:00 Thickness and Roughness Variations of Arctic Multiyear Sea Ice Ackley,S. F. Hibler,W. D. , III Kugzruk,F. K. Kovacs,A. Weeks,W. F. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H 1976-06 text/html http://www.dtic.mil/docs/citations/ADA028086 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA028086 en eng http://www.dtic.mil/docs/citations/ADA028086 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost *SEA ICE MATHEMATICAL MODELS DENSITY THICKNESS LOAD DISTRIBUTION TIME DEPENDENCE SURFACE ROUGHNESS ANALYSIS OF VARIANCE DEPTH CRACK PROPAGATION PROFILES ELEVATION SALINITY BENDING STRESS ARCTIC OCEAN ISOSTATIC CHANGE Ice mechanics Multiyear sea ice Ice floes Text 1976 ftdtic 2016-02-20T11:20:08Z Three surface elevation and ice thickness profiles obtained during the 1972 Arctic Ice Dynamics Joint Experiment on a multiyear ice floe were analyzed to obtain relationships between surface elevation, thickness and physical properties of the ice. It was found that for ice freeboards from 0.10 m to 1.05 m above sea level a linear relationship between ice density and freeboard could be postulated. The equation for the regression line is: Ice density = -194f' + 974 kg/cu m where f' is the ice freeboard plus snow depth in ice equivalent at the point in question. This statistical relationship is consistent with observed physical properties, which indicate that as the ice freeboard increases, ice salinity decreases and the higher freeboard or thicker ice therefore decreases in density. Using this variable density with freeboard relationship, a model was constructed to predict ice thickness, given ice freeboard and snow depth alone. This prediction is desirable, since snow depth and freeboard are relatively easy to obtain, whereas ice thickness can usually be obtained only by drilling through the ice. The model was compared with two other models. It was found that the variable density prediction model gave the best approximation to observed ice thickness, with a standard error between the measured and predicted value of about 0.4 m, compared with errors from 50 to 100% higher for the other two models. Text Arctic Arctic Ocean Ice permafrost Sea ice Defense Technical Information Center: DTIC Technical Reports database Arctic Arctic Ocean |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost *SEA ICE MATHEMATICAL MODELS DENSITY THICKNESS LOAD DISTRIBUTION TIME DEPENDENCE SURFACE ROUGHNESS ANALYSIS OF VARIANCE DEPTH CRACK PROPAGATION PROFILES ELEVATION SALINITY BENDING STRESS ARCTIC OCEAN ISOSTATIC CHANGE Ice mechanics Multiyear sea ice Ice floes |
spellingShingle |
Snow Ice and Permafrost *SEA ICE MATHEMATICAL MODELS DENSITY THICKNESS LOAD DISTRIBUTION TIME DEPENDENCE SURFACE ROUGHNESS ANALYSIS OF VARIANCE DEPTH CRACK PROPAGATION PROFILES ELEVATION SALINITY BENDING STRESS ARCTIC OCEAN ISOSTATIC CHANGE Ice mechanics Multiyear sea ice Ice floes Ackley,S. F. Hibler,W. D. , III Kugzruk,F. K. Kovacs,A. Weeks,W. F. Thickness and Roughness Variations of Arctic Multiyear Sea Ice |
topic_facet |
Snow Ice and Permafrost *SEA ICE MATHEMATICAL MODELS DENSITY THICKNESS LOAD DISTRIBUTION TIME DEPENDENCE SURFACE ROUGHNESS ANALYSIS OF VARIANCE DEPTH CRACK PROPAGATION PROFILES ELEVATION SALINITY BENDING STRESS ARCTIC OCEAN ISOSTATIC CHANGE Ice mechanics Multiyear sea ice Ice floes |
description |
Three surface elevation and ice thickness profiles obtained during the 1972 Arctic Ice Dynamics Joint Experiment on a multiyear ice floe were analyzed to obtain relationships between surface elevation, thickness and physical properties of the ice. It was found that for ice freeboards from 0.10 m to 1.05 m above sea level a linear relationship between ice density and freeboard could be postulated. The equation for the regression line is: Ice density = -194f' + 974 kg/cu m where f' is the ice freeboard plus snow depth in ice equivalent at the point in question. This statistical relationship is consistent with observed physical properties, which indicate that as the ice freeboard increases, ice salinity decreases and the higher freeboard or thicker ice therefore decreases in density. Using this variable density with freeboard relationship, a model was constructed to predict ice thickness, given ice freeboard and snow depth alone. This prediction is desirable, since snow depth and freeboard are relatively easy to obtain, whereas ice thickness can usually be obtained only by drilling through the ice. The model was compared with two other models. It was found that the variable density prediction model gave the best approximation to observed ice thickness, with a standard error between the measured and predicted value of about 0.4 m, compared with errors from 50 to 100% higher for the other two models. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H |
format |
Text |
author |
Ackley,S. F. Hibler,W. D. , III Kugzruk,F. K. Kovacs,A. Weeks,W. F. |
author_facet |
Ackley,S. F. Hibler,W. D. , III Kugzruk,F. K. Kovacs,A. Weeks,W. F. |
author_sort |
Ackley,S. F. |
title |
Thickness and Roughness Variations of Arctic Multiyear Sea Ice |
title_short |
Thickness and Roughness Variations of Arctic Multiyear Sea Ice |
title_full |
Thickness and Roughness Variations of Arctic Multiyear Sea Ice |
title_fullStr |
Thickness and Roughness Variations of Arctic Multiyear Sea Ice |
title_full_unstemmed |
Thickness and Roughness Variations of Arctic Multiyear Sea Ice |
title_sort |
thickness and roughness variations of arctic multiyear sea ice |
publishDate |
1976 |
url |
http://www.dtic.mil/docs/citations/ADA028086 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA028086 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ice permafrost Sea ice |
genre_facet |
Arctic Arctic Ocean Ice permafrost Sea ice |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA028086 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766326570587258880 |