Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean.
Flow in the boundary layer under Arctic ice was measured in March 1970, in March-April 1971, and again in March-April 1972 using a number of specially designed four cm diameter current meters capable of resolving velocity component fluctuations up to five Hz. These meters were attached to instrument...
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ftdtic:ADA007344 2023-05-15T14:52:37+02:00 Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean. Smith,J. Dungan WASHINGTON UNIV SEATTLE DEPT OF OCEANOGRAPHY 1975-02 text/html http://www.dtic.mil/docs/citations/ADA007344 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA007344 en eng http://www.dtic.mil/docs/citations/ADA007344 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Physical and Dynamic Oceanography Snow Ice and Permafrost *TURBULENT FLOW *SEA ICE *ARCTIC OCEAN STRESSES DENSITY MEASUREMENT OCEAN CURRENTS BOUNDARY LAYER DRIFT WIND VELOCITY CONVECTION(HEAT TRANSFER) SALINITY REYNOLDS NUMBER FLOWMETERS MOMENTUM Arctic Ice Dynamics Joint Experiment Text 1975 ftdtic 2016-02-20T09:22:03Z Flow in the boundary layer under Arctic ice was measured in March 1970, in March-April 1971, and again in March-April 1972 using a number of specially designed four cm diameter current meters capable of resolving velocity component fluctuations up to five Hz. These meters were attached to instrument masts in orthogonal triplets at six or more depths beneath the ice. Mean and fluctuating velocity components were calculated for each of the instrument locations. The current field filtered with a 40 minute running average was found to be unsteady and to reflect the ice drift and wind velocities. During storms the 1971 data reveal a right-handed Ekman spiral to 16m. Below 16m the Ekman spiral sometimes continues in the proper direction and sometimes reverses. A steadier spiral is shown in the 1972 measurements. Turbulent intensities and Reynolds stresses, calculated from the fluctuating velocity field, generally reflect the structure of the density and mean velocity fields. The boundary layer examined in the 1972 experiment was unstable and downware flux of horizontal momentum was due primarily to brine driven convection. Text Arctic Arctic Ocean Ice permafrost Sea ice Defense Technical Information Center: DTIC Technical Reports database Arctic Arctic Ocean Triplets ENVELOPE(-59.750,-59.750,-62.383,-62.383) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Physical and Dynamic Oceanography Snow Ice and Permafrost *TURBULENT FLOW *SEA ICE *ARCTIC OCEAN STRESSES DENSITY MEASUREMENT OCEAN CURRENTS BOUNDARY LAYER DRIFT WIND VELOCITY CONVECTION(HEAT TRANSFER) SALINITY REYNOLDS NUMBER FLOWMETERS MOMENTUM Arctic Ice Dynamics Joint Experiment |
spellingShingle |
Physical and Dynamic Oceanography Snow Ice and Permafrost *TURBULENT FLOW *SEA ICE *ARCTIC OCEAN STRESSES DENSITY MEASUREMENT OCEAN CURRENTS BOUNDARY LAYER DRIFT WIND VELOCITY CONVECTION(HEAT TRANSFER) SALINITY REYNOLDS NUMBER FLOWMETERS MOMENTUM Arctic Ice Dynamics Joint Experiment Smith,J. Dungan Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean. |
topic_facet |
Physical and Dynamic Oceanography Snow Ice and Permafrost *TURBULENT FLOW *SEA ICE *ARCTIC OCEAN STRESSES DENSITY MEASUREMENT OCEAN CURRENTS BOUNDARY LAYER DRIFT WIND VELOCITY CONVECTION(HEAT TRANSFER) SALINITY REYNOLDS NUMBER FLOWMETERS MOMENTUM Arctic Ice Dynamics Joint Experiment |
description |
Flow in the boundary layer under Arctic ice was measured in March 1970, in March-April 1971, and again in March-April 1972 using a number of specially designed four cm diameter current meters capable of resolving velocity component fluctuations up to five Hz. These meters were attached to instrument masts in orthogonal triplets at six or more depths beneath the ice. Mean and fluctuating velocity components were calculated for each of the instrument locations. The current field filtered with a 40 minute running average was found to be unsteady and to reflect the ice drift and wind velocities. During storms the 1971 data reveal a right-handed Ekman spiral to 16m. Below 16m the Ekman spiral sometimes continues in the proper direction and sometimes reverses. A steadier spiral is shown in the 1972 measurements. Turbulent intensities and Reynolds stresses, calculated from the fluctuating velocity field, generally reflect the structure of the density and mean velocity fields. The boundary layer examined in the 1972 experiment was unstable and downware flux of horizontal momentum was due primarily to brine driven convection. |
author2 |
WASHINGTON UNIV SEATTLE DEPT OF OCEANOGRAPHY |
format |
Text |
author |
Smith,J. Dungan |
author_facet |
Smith,J. Dungan |
author_sort |
Smith,J. Dungan |
title |
Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean. |
title_short |
Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean. |
title_full |
Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean. |
title_fullStr |
Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean. |
title_full_unstemmed |
Turbulent Structure of the Surface Boundary Layer in an Ice-Covered Ocean. |
title_sort |
turbulent structure of the surface boundary layer in an ice-covered ocean. |
publishDate |
1975 |
url |
http://www.dtic.mil/docs/citations/ADA007344 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA007344 |
long_lat |
ENVELOPE(-59.750,-59.750,-62.383,-62.383) |
geographic |
Arctic Arctic Ocean Triplets |
geographic_facet |
Arctic Arctic Ocean Triplets |
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/ADA007344 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766323855511519232 |