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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Bibliographic Details
Main Author: Stone, Rebecca E.
Other Authors: NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Format: Text
Language:English
Published: 1997
Subjects:
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
Greenland
Greenland Sea
Online Access:http://www.dtic.mil/docs/citations/ADA331956
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA331956
Description
Summary: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.

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