Accession Number : ADA180509

Title :   Numerical Studies of Frontal Dynamics.

Descriptive Note : Final rept. 1 Nov 83-30 Nov 86,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIGHT CENTER

Personal Author(s) : Keyser,Daniel

Report Date : 31 DEC 1986

Pagination or Media Count : 13

Abstract : Efforts concentrated on the development of a two dimensional primitive equation (PE) model of frontogenesis that simultaneously incorporates the frontagenetical mechanisms of confluence and horizontal shear. Applying this model to study the effects of upper level frontogenesis, it appeared to be dominated by tilting effects associated with cross front variation of vertical motion, in which subsidence is maximized within and to the warm side of the frontal zone. Results suggest that aspects characteristics of three-dimensional barolinic waves may be abstracted to a significant extent in a two dimensional framework. They also show that upper-level frontogenesis and tropopause folding can occur in the absence of three-dimensional curvature effects, commonly believed to be necessary for realistic upper-level frontogenesis. An implication of the dominant tilting effects is that they may have to be adequately resolved by numerical weather prediction models, thus requiring better horizontal and vertical resolution. Keywords: Frontogenesis; Primitive equation model; Tilting; Confluence; Shear.

Descriptors :   *FRONTS(METEOROLOGY), EQUATIONS, HORIZONTAL ORIENTATION, SHEAR PROPERTIES, NUMERICAL ANALYSIS, CURVATURE, THREE DIMENSIONAL, FOLDING, TROPOPAUSE, EQUATIONS, MATHEMATICAL MODELS, CONFLUENCE, MATHEMATICAL MODELS, MATHEMATICAL PREDICTION, NUMERICAL ANALYSIS, WEATHER FORECASTING, TILT, MOTION, VERTICAL ORIENTATION, ATMOSPHERE MODELS

Subject Categories : Atmospheric Physics
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE