Accession Number : ADA260854


Title :   Assessing the Energetic Interactions of Subtidal Flow on The Continental Slop in an Eastern Boundary Region


Descriptive Note : Doctoral thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Tisch, Timothy D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260854.pdf


Report Date : Dec 1992


Pagination or Media Count : 222


Abstract : Seventeen-month time series (May 1989 - October 1990) of current, temperature and conductivity were obtained from 100, 350, and 500 m depth at site P2, located on the 800 m isobath off Point Sur, and one-year time series (May 1990 - May 1991) of the same variables at similar depths were obtained from site P3, approximately 25 km farther offshore on the 1800 m isobath. Results show that no net growth or decay of eddy potential energy (EPE) occurred at either mooring site during their respective deployment periods. At mooring P2, baroclinic instabilities within the water column were signaled by downgradient horizontal eddy heat fluxes that converted mean potential energy (MPE) to EPE at both 225 and 425 m. The dominant balance at 225 m was between mean flow advection (source) and upward eddy heat fluxes (EPE to eddy kinetic energy, EKE) , with additional losses coming from downstream advection by the eddy flow. At 425 m, the dominant balance was between downgradient eddy heat fluxes (source) and downstream advection by eddy flow (sink). Unlike 225 m, vertical eddy heat fluxes at 425 m were a weak source (EKE to EPE) while mean flow advection was negligible. At P3, the net balance involved only downward eddy heat fluxes (source) and downstream advection by eddy flow (sink), as mean advection and MPE-EPE conversions were negligible. Analysis of energetic events within the time series of terms in the EPE equation did not reveal any canonical or common pattern which would explain the temporal means described above, but suggest the flow in this region is highly variable.


Descriptors :   *OCEAN CURRENTS , *EDDIES(FLUID MECHANICS) , *AIR WATER INTERACTIONS , VELOCITY , CONVERSION , CONDUCTIVITY , WIND , TIME , KINETIC ENERGY , LOSSES , MOORING , OFFSHORE , BOUNDARY LAYER FLOW , ADVECTION , HEAT FLUX , POTENTIAL ENERGY , MEAN , CALIFORNIA , OCEANOGRAPHIC DATA , DEPTH , THESES , ENERGY , TEMPERATURE , WATER FLOW


Subject Categories : Meteorology
      Physical and Dynamic Oceanography


Distribution Statement : APPROVED FOR PUBLIC RELEASE