Accession Number : ADA305381

Title :   Coupling a Basin-Wide, Coarse-Resolution North Atlantic and a Regional, Fine-Resolution Gulf of Mexico Model.

Descriptive Note : Technical rept.,

Corporate Author : UNIVERSITY OF SOUTHERN MISSISSIPPI STENNIS SPACE CENTER CENTER FOR OCEAN AND ATMOSPHERIC MODELING

Personal Author(s) : Peggion, Germana

PDF Url : ADA305381

Report Date : OCT 1995

Pagination or Media Count : 46

Abstract : A reduced-gravity model is configured in the North Atlantic (NAtl) Ocean and Gulf of Mexico (GOM) to investigate the wind-driven circulation and the variability of the associated current systems. The analysis is focused on the circulation of the western tropical NAtl and its relationship to the mesoscale activity inside the GOM. Several experiments investigate the solutions as a function of the Rossby radius of deformation and the specification of the South Atlantic inflow. The GOM dynamics are analyzed with both the basin-wide coarse-resolution and the regional high-resolution models. Both configurations are able to reproduce eddy shedding: the time and length scales of the Loop Current (LpCur) variability do not depend upon the grid resolution. The NAtl simulations indicate that the transport at the Yucatan and Florida Straits are not strongly correlated. Also, no significant correlation is found between eddy shedding events and the GOM transport anomaly. The evolution of the LpCur instability is dependent upon the Rossby radius of deformation, LR, rather than inflow transport. For large LR, the separated rings migrate westward as dispersive linear Rossby waves. As LR decreases, the detached eddies migrate as nonlinear, isolated vortices. The nonlinear character of the LpCur increases with the inflow transport and enhances more interaction between rings and the main stream during separation events.

Descriptors :   *MATHEMATICAL MODELS, *OCEAN CURRENTS, *WIND VELOCITY, *OCEAN MODELS, *NORTH ATLANTIC OCEAN, *MEXICO GULF, ANOMALIES, DYNAMICS, DEFORMATION, GRIDS, RESOLUTION, ISOLATION, EDDIES(FLUID MECHANICS), VORTICES, THREE DIMENSIONAL, NONLINEAR SYSTEMS, SCALE, LENGTH, LINEARITY, TRANSPORT, SEPARATION, FLOW, WAVES, FLORIDA, RADIUS(MEASURE), EDDY CURRENTS, DISPERSIONS, ROSSBY WAVES, STRAITS, SOUTH ATLANTIC OCEAN.

Subject Categories : Meteorology
      Physical and Dynamic Oceanography
      Operations Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE