Accession Number : ADA298587

Title :   Kinematics and Dynamics of a Cyclonic Eddy Off Pt. Arena, California.

Descriptive Note : Doctoral thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Chumbinho, Rogerio P.

PDF Url : ADA298587

Report Date : DEC 1994

Pagination or Media Count : 98

Abstract : In situ hydrographic data and remotely sensed sea surface temperature data were analyzed to describe the kinematics and dynamics of a cyclonic eddy observed off Point Arena, California, in May 1993. The hydrographic data were first objectively analyzed using multiquadric-biharmonic interpolation (M%B) to obtain a three- dimensional field of density. This was then used in a primitive equation (PE) model with a digital filter initialization method to arrive at the dynamically balanced three-dimensional velocity field, including the vertical motion. Several aspects related to geostrophic adjustment, to data analysis and to the lack of exact synopticity in the observations were examined; these include the effects of internal tides, eddy rotation and MQ-B parameters sensitivity analysis. The results reveal a cyclonic circulation with meanders in the otherwise nearly circular flow, and maximum horizontal speeds of about 40-5O cm/s at the surface. The meanders have associated patterns of radially aligned patches of sinking and rising motion, extending coherently to about 500 m depth, with maximum vertical velocities of 2022 m/day between 100 and 150 m depth. Because of the strong horizontal currents and the short horizontal length scales involved, the particle vertical excursions are very small. (MM)

Descriptors :   *OCEAN CURRENTS, *EDDIES(FLUID MECHANICS), *HYDROGRAPHY, *GEOSTROPHIC CURRENTS, *CYCLONES, KINEMATICS, VELOCITY, DATA PROCESSING, DENSITY, OCEAN SURFACE, THESES, OCEANOGRAPHIC DATA, VERTICAL ORIENTATION, WIND DIRECTION, WIND VELOCITY, CALIFORNIA, HORIZONTAL ORIENTATION, SALINITY, SURFACE TEMPERATURE, CIRCULATION, INTERNAL WAVES, DIGITAL FILTERS, RECONNAISSANCE SATELLITES, OCEAN TIDES.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE