Deep Mixed Layer Entrainment.
A bulk turbulence-closure mixed layer model is generalized to allow prediction of very deep polar sea mixing. The model includes unsteady three-component turbulent kinetic energy budgets. In addition to terms for shear production, pressure redistribution, and dissipation, special attention is devote...
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ftdtic:ADA331956 2023-05-15T16:28:15+02:00 Deep Mixed Layer Entrainment. Stone, Rebecca E. NAVAL POSTGRADUATE SCHOOL MONTEREY CA 1997-03 text/html http://www.dtic.mil/docs/citations/ADA331956 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA331956 en eng http://www.dtic.mil/docs/citations/ADA331956 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Physical Chemistry Physical and Dynamic Oceanography *OCEAN SURFACE *OCEANOGRAPHIC DATA *ENTRAINMENT POLAR REGIONS THESES BOUNDARY LAYER TURBULENCE METEOROLOGICAL DATA THERMAL EXPANSION KINETIC ENERGY OCEANS BAROMETRIC PRESSURE MIXED LAYER(MARINE) TEMPERATURE COEFFICIENTS STRATIFICATION DEEP WATER GREENLAND SEA EARTH ATMOSPHERE MILITARY OCEANOGRAPHY CORIOLIS EFFECT Text 1997 ftdtic 2016-02-19T21:10:51Z A bulk turbulence-closure mixed layer model is generalized to allow prediction of very deep polar sea mixing. The model includes unsteady three-component turbulent kinetic energy budgets. In addition to terms for shear production, pressure redistribution, and dissipation, special attention is devoted to realistic treatment of thermobaric enhancement of buoyancy flux and to Coriolis effect on turbulence. The model is initialized and verified with CTD data taken by R/V Valdivia in the Greenland Sea during winter 1993-1994. Model simulations show (1) mixed layer deepening is significantly enhanced when the thermal expansion coefficient's increase with pressure is included; (2) entrainment rate is sensitive to the direction of wind stress because of Coriolis; and (3) the predicted mixed layer depth evolution agrees qualitatively with the observations. Results demonstrate the importance of water column initial conditions, accurate representation of strong surface cooling events, and inclusion of the thermobaric effect on buoyancy, to determine the depth of mixing and ultimately the heat and salt flux into the deep ocean. Since coupling of the ocean to the atmosphere through deep mixed layers in polar regions is fundamental to our climate system, it is important that regional and global models be developed that incorporate realistic representation of this coupling. Text Greenland Greenland Sea Defense Technical Information Center: DTIC Technical Reports database Greenland |
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Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Physical Chemistry Physical and Dynamic Oceanography *OCEAN SURFACE *OCEANOGRAPHIC DATA *ENTRAINMENT POLAR REGIONS THESES BOUNDARY LAYER TURBULENCE METEOROLOGICAL DATA THERMAL EXPANSION KINETIC ENERGY OCEANS BAROMETRIC PRESSURE MIXED LAYER(MARINE) TEMPERATURE COEFFICIENTS STRATIFICATION DEEP WATER GREENLAND SEA EARTH ATMOSPHERE MILITARY OCEANOGRAPHY CORIOLIS EFFECT |
spellingShingle |
Physical Chemistry Physical and Dynamic Oceanography *OCEAN SURFACE *OCEANOGRAPHIC DATA *ENTRAINMENT POLAR REGIONS THESES BOUNDARY LAYER TURBULENCE METEOROLOGICAL DATA THERMAL EXPANSION KINETIC ENERGY OCEANS BAROMETRIC PRESSURE MIXED LAYER(MARINE) TEMPERATURE COEFFICIENTS STRATIFICATION DEEP WATER GREENLAND SEA EARTH ATMOSPHERE MILITARY OCEANOGRAPHY CORIOLIS EFFECT Stone, Rebecca E. Deep Mixed Layer Entrainment. |
topic_facet |
Physical Chemistry Physical and Dynamic Oceanography *OCEAN SURFACE *OCEANOGRAPHIC DATA *ENTRAINMENT POLAR REGIONS THESES BOUNDARY LAYER TURBULENCE METEOROLOGICAL DATA THERMAL EXPANSION KINETIC ENERGY OCEANS BAROMETRIC PRESSURE MIXED LAYER(MARINE) TEMPERATURE COEFFICIENTS STRATIFICATION DEEP WATER GREENLAND SEA EARTH ATMOSPHERE MILITARY OCEANOGRAPHY CORIOLIS EFFECT |
description |
A bulk turbulence-closure mixed layer model is generalized to allow prediction of very deep polar sea mixing. The model includes unsteady three-component turbulent kinetic energy budgets. In addition to terms for shear production, pressure redistribution, and dissipation, special attention is devoted to realistic treatment of thermobaric enhancement of buoyancy flux and to Coriolis effect on turbulence. The model is initialized and verified with CTD data taken by R/V Valdivia in the Greenland Sea during winter 1993-1994. Model simulations show (1) mixed layer deepening is significantly enhanced when the thermal expansion coefficient's increase with pressure is included; (2) entrainment rate is sensitive to the direction of wind stress because of Coriolis; and (3) the predicted mixed layer depth evolution agrees qualitatively with the observations. Results demonstrate the importance of water column initial conditions, accurate representation of strong surface cooling events, and inclusion of the thermobaric effect on buoyancy, to determine the depth of mixing and ultimately the heat and salt flux into the deep ocean. Since coupling of the ocean to the atmosphere through deep mixed layers in polar regions is fundamental to our climate system, it is important that regional and global models be developed that incorporate realistic representation of this coupling. |
author2 |
NAVAL POSTGRADUATE SCHOOL MONTEREY CA |
format |
Text |
author |
Stone, Rebecca E. |
author_facet |
Stone, Rebecca E. |
author_sort |
Stone, Rebecca E. |
title |
Deep Mixed Layer Entrainment. |
title_short |
Deep Mixed Layer Entrainment. |
title_full |
Deep Mixed Layer Entrainment. |
title_fullStr |
Deep Mixed Layer Entrainment. |
title_full_unstemmed |
Deep Mixed Layer Entrainment. |
title_sort |
deep mixed layer entrainment. |
publishDate |
1997 |
url |
http://www.dtic.mil/docs/citations/ADA331956 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA331956 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland Sea |
genre_facet |
Greenland Greenland Sea |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA331956 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766017885261529088 |