Investigation of Ice Dynamics in the Marginal Ice Zone.
The dynamics of sea ice in the marginal ice zone (MIZ) are considered both from theoretical and from experimental point of view. Ice kinematics measurements were made with the Del Norte microwave trisponder system in MIZEX-83 and MIZEX-84 Greenland Sea experiments. Differential ice motion was measur...
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ftdtic:ADA181392 2023-05-15T16:18:07+02:00 Investigation of Ice Dynamics in the Marginal Ice Zone. Leppaeranta,Matti Hibler,William D. , III MARINE RESEARCH INST HELSINKI (FINLAND) 1987-04-23 text/html http://www.dtic.mil/docs/citations/ADA181392 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA181392 en eng http://www.dtic.mil/docs/citations/ADA181392 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost *SEA ICE *RHEOLOGY CYCLES DRIFT DYNAMICS FREQUENCY ICE INERTIAL SYSTEMS KINEMATICS LOW FREQUENCY MEASUREMENT MOTION NOISE PEAK VALUES RATES RED(COLOR) SHEAR PROPERTIES STATIONS VARIATIONS VELOCITY GREENLAND SEA VISCOPLASTIC PROPERTIES DEFORMATION THICKNESS PACK ICE MATHEMATICAL MODELS EDGES SEA WATER WATER WAVES INTERFACES OCEAN CURRENTS FINLAND Marinal zones Ice mechanics Ice water interface Fram strait ASH57 PE61102A Text 1987 ftdtic 2016-02-19T09:44:36Z The dynamics of sea ice in the marginal ice zone (MIZ) are considered both from theoretical and from experimental point of view. Ice kinematics measurements were made with the Del Norte microwave trisponder system in MIZEX-83 and MIZEX-84 Greenland Sea experiments. Differential ice motion was measured with four to six stations on the ice in the scale of 2-20 km at three minute intervals. On several occasions a rapid slip occurred in measured distances. Ice velocity fluctuations were typically of the order of 1 cm/s and large deformation rates a few per cent hour. Various spectra of differential ice drift showed a moderate inertial peak and a red noise character at higher frequencies, up to about half-hour period. The maximum rate of shear was about twice as large as divergence from 12-h to about 2-h period. Analysis of current measurements beneath the drifting ice show that current variations show up highly damped in the ice. In differential motion, ice-current coherence was significant only at low frequencies (lower than one cycle per day). Text Fram Strait Greenland Greenland Sea Ice permafrost Sea ice Defense Technical Information Center: DTIC Technical Reports database Greenland |
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 *RHEOLOGY CYCLES DRIFT DYNAMICS FREQUENCY ICE INERTIAL SYSTEMS KINEMATICS LOW FREQUENCY MEASUREMENT MOTION NOISE PEAK VALUES RATES RED(COLOR) SHEAR PROPERTIES STATIONS VARIATIONS VELOCITY GREENLAND SEA VISCOPLASTIC PROPERTIES DEFORMATION THICKNESS PACK ICE MATHEMATICAL MODELS EDGES SEA WATER WATER WAVES INTERFACES OCEAN CURRENTS FINLAND Marinal zones Ice mechanics Ice water interface Fram strait ASH57 PE61102A |
spellingShingle |
Snow Ice and Permafrost *SEA ICE *RHEOLOGY CYCLES DRIFT DYNAMICS FREQUENCY ICE INERTIAL SYSTEMS KINEMATICS LOW FREQUENCY MEASUREMENT MOTION NOISE PEAK VALUES RATES RED(COLOR) SHEAR PROPERTIES STATIONS VARIATIONS VELOCITY GREENLAND SEA VISCOPLASTIC PROPERTIES DEFORMATION THICKNESS PACK ICE MATHEMATICAL MODELS EDGES SEA WATER WATER WAVES INTERFACES OCEAN CURRENTS FINLAND Marinal zones Ice mechanics Ice water interface Fram strait ASH57 PE61102A Leppaeranta,Matti Hibler,William D. , III Investigation of Ice Dynamics in the Marginal Ice Zone. |
topic_facet |
Snow Ice and Permafrost *SEA ICE *RHEOLOGY CYCLES DRIFT DYNAMICS FREQUENCY ICE INERTIAL SYSTEMS KINEMATICS LOW FREQUENCY MEASUREMENT MOTION NOISE PEAK VALUES RATES RED(COLOR) SHEAR PROPERTIES STATIONS VARIATIONS VELOCITY GREENLAND SEA VISCOPLASTIC PROPERTIES DEFORMATION THICKNESS PACK ICE MATHEMATICAL MODELS EDGES SEA WATER WATER WAVES INTERFACES OCEAN CURRENTS FINLAND Marinal zones Ice mechanics Ice water interface Fram strait ASH57 PE61102A |
description |
The dynamics of sea ice in the marginal ice zone (MIZ) are considered both from theoretical and from experimental point of view. Ice kinematics measurements were made with the Del Norte microwave trisponder system in MIZEX-83 and MIZEX-84 Greenland Sea experiments. Differential ice motion was measured with four to six stations on the ice in the scale of 2-20 km at three minute intervals. On several occasions a rapid slip occurred in measured distances. Ice velocity fluctuations were typically of the order of 1 cm/s and large deformation rates a few per cent hour. Various spectra of differential ice drift showed a moderate inertial peak and a red noise character at higher frequencies, up to about half-hour period. The maximum rate of shear was about twice as large as divergence from 12-h to about 2-h period. Analysis of current measurements beneath the drifting ice show that current variations show up highly damped in the ice. In differential motion, ice-current coherence was significant only at low frequencies (lower than one cycle per day). |
author2 |
MARINE RESEARCH INST HELSINKI (FINLAND) |
format |
Text |
author |
Leppaeranta,Matti Hibler,William D. , III |
author_facet |
Leppaeranta,Matti Hibler,William D. , III |
author_sort |
Leppaeranta,Matti |
title |
Investigation of Ice Dynamics in the Marginal Ice Zone. |
title_short |
Investigation of Ice Dynamics in the Marginal Ice Zone. |
title_full |
Investigation of Ice Dynamics in the Marginal Ice Zone. |
title_fullStr |
Investigation of Ice Dynamics in the Marginal Ice Zone. |
title_full_unstemmed |
Investigation of Ice Dynamics in the Marginal Ice Zone. |
title_sort |
investigation of ice dynamics in the marginal ice zone. |
publishDate |
1987 |
url |
http://www.dtic.mil/docs/citations/ADA181392 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA181392 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Fram Strait Greenland Greenland Sea Ice permafrost Sea ice |
genre_facet |
Fram Strait Greenland Greenland Sea Ice permafrost Sea ice |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA181392 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766004248596709376 |