Accession Number : ADA182341

Title :   The Entrainment and Homogenization of Tracers within the Cyclonic Gulf Stream Recirculation Gyre.

Descriptive Note : Doctoral thesis,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Personal Author(s) : Pickart,Robert S

PDF Url : ADA182341

Report Date : May 1987

Pagination or Media Count : 218

Abstract : The distributions of tracer associated with the Northern Recirculation Gyre of the Gulf Stream (NRG) are studied to try to obtain information about the flow. An advective-diffusive numerical model is used whose streamlines consist of a gyre situated alongside a boundary current which inputs tracer into the domain. This is meant to simulate the lateral transfer of properties from the Deep Western Boundary Current (DWBC) to the NRG. Tracer is entrained into the model gyre as a plume which spirals across the streamlines, the characteristics of which depend on the flow parameters. Homogenization occurs at steady state, consistent with recently collected tracer data. The presence of vertical mixing is considered in an attempt to explain a difference between salinity and oxygen observed in the data. Comparison of the model results to the oxygen data is favorable, and leads to an estimate of the lateral and vertical diffusivity. The time dependent nature of freon is addressed using a coupled model of the deep water overflow process, advection-mixing in the DWBC, and subsequent entrainment into the NRG. Comparison with the data shows that very little freon has accumulated in the NRG, and that these processes effect the freon-11:freon-12 ratio as well. Keywords: Gulf Stream recirculation. (Theses).

Descriptors :   *OCEAN CURRENTS, *GULF STREAM, *EDDIES(FLUID MECHANICS), BOUNDARIES, COUPLING(INTERACTION), MODELS, DEEP OCEANS, FLUORINATED HYDROCARBONS, RECIRCULATION, OXYGEN, COMPARISON, CYCLONES, FLOW, NORTH(DIRECTION), ADVECTION, DIFFUSIVITY, OCEANOGRAPHIC DATA, MATHEMATICAL MODELS, ENTRAINMENT, HOMOGENEITY, TRACER STUDIES, WATER FLOW, SEA WATER, NORTH ATLANTIC OCEAN, SALINITY, THESES, STEADY STATE, MIXING, VERTICAL ORIENTATION

Subject Categories : Physical and Dynamic Oceanography
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE