Accession Number : ADA331143

Title :   Frontal Evolution in Layered Models: Mixed Layer Dynamics and the Stability of Forced Fronts.

Descriptive Note : Final rept. 1 Jun 94-31 Aug 97,

Corporate Author : WASHINGTON UNIV SEATTLE SCHOOL OF OCEANOGRAPHY

Personal Author(s) : Thompson, LuAnne

PDF Url : ADA331143

Report Date : 28 OCT 1997

Pagination or Media Count : 6

Abstract : The study of evolving unstable fronts in the ocean was the focus of this work. Several approaches have been taken. The cross-front structure in a mean sense was studied in several different ways, first with a quasi-two-dimensional model where the influence of Ekman layers on the evolving front was explored. Second, an adiabatic isopycnal model was used to explore the equilibration of a baroclinically unstable front and the net exchange of mass and fluid parcels across the mean jet both at small and finite amplitude. In addition, the quasi-geostorphic approximation was tested in this context and found to be a good predictor of flow at finite amplitude, baring an asymmetry in cross-frontal structure that appears when the Rossby number gets big. Mixed-layer models in the context of baroclinically unstable fronts were also explored, in particular the evolution of a mixed-layer front in the presence of forcing. In this case, an asymmetry appears because of the forcing. The mixed-layer model was coupled to the adiabatic model and additional application of the couple model is being explored.

Descriptors :   *FRONTS(OCEANOGRAPHY), OCEAN CURRENTS, LAYERS, OCEAN MODELS, ADIABATIC CONDITIONS.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE