Accession Number : ADA305883

Title :   Application of an Inverse Model in the Community Modeling Effort Results.

Descriptive Note : Doctoral thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Zhang, Huai-Min

PDF Url : ADA305883

Report Date : FEB 1995

Pagination or Media Count : 266

Abstract : An inverse model (IM) consisting of approximate thermal wind balance and steady state conservation laws for mass, heat, and salt was examined in (1) a non-eddy resolving GCM ocean, (2) the 5-year time means of an eddy-resolving GCM (EGCM) ocean with a fine grid resolution, and (3) the spatially smoothed time means of the EGCM ocean with a coarse grid resolution. Assumptions of the IM were approximately satisfied by (1), (2), and (3), but residuals in conservation equations were comarable to (eddy) diffusion terms in deep ocean. IM estimates for horizontal circulation were robust - they were consistent with the circulation in (1), the time-mean circulation in (2), and the spatially smoothed time-mean circulation in (3) most of the time. Effects of the data noise were more easily seen on solutions for (eddy) diffusion coefficients. Discrepancies between conclusions of this work and previous studies were explained. Data noise in the coarse grid resolution was partially caused by subsampling. This aliasing was greatly reduced by spatial smoothing. IM solutions were sensitive to vertical level numbers while insensitive to horizontal domain size. Properly representing the (vertical) profiles of hydrographic data was essential in getting the correct answers. (AN)

Descriptors :   *MATHEMATICAL MODELS, *OCEAN CURRENTS, *OCEAN MODELS, HEAT TRANSFER, DATA BASES, STEADY STATE, SPATIAL DISTRIBUTION, UNCERTAINTY, OCEAN SURFACE, TIME DEPENDENCE, PARAMETERS, STATISTICAL INFERENCE, GRIDS, RESOLUTION, TIME SERIES ANALYSIS, ANALYSIS OF VARIANCE, THESES, EDDIES(FLUID MECHANICS), FINITE DIFFERENCE THEORY, OCEANOGRAPHIC DATA, THERMAL DIFFUSION, APPROXIMATION(MATHEMATICS), ERROR ANALYSIS, MASS TRANSFER, POLYNOMIALS, INTERPOLATION, MIXING, DIFFUSION COEFFICIENT, INVERSE SCATTERING, SALTS, SALINITY, DYNAMIC PROGRAMMING, MARINE CLIMATOLOGY, HYDROGRAPHY, AIR WATER INTERACTIONS, CIRCULATION, ADVECTION, HEAT BALANCE, DEEP OCEANS, SMOOTHING(MATHEMATICS).

Subject Categories : Physical and Dynamic Oceanography
      Operations Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE