Accession Number : ADA113087

Title :   The Implication of Eddy Diffusion of Momentum and Heat on the Upper Boundary Condition in Atmospheric Motions,

Corporate Author : MARYLAND UNIV COLLEGE PARK DEPT OF METEOROLOGY

Personal Author(s) : Baer,F ; Giwa,F

PDF Url : ADA113087

Report Date : Jan 1982

Pagination or Media Count : 23

Abstract : By analyzing the equations of motion governing atmospheric motion in terms of spectral Hough functions, it is shown that for most of the possible motions in the atmosphere, the often used 'boundary conditions' omega = O or alpha = O at P sub T = O are in fact not true boundary conditions but merely the statement of a somewhat obscure property of the governing equations. For a top pressure P sub T not equal 0, these are true mathematical boundary conditions with the following difficulties: There is no obvious physical interpretation; and the resulting motion below is sensitive to the nature of the boundary condition and the level at which it is applied. It is shown that the boundary condition which states that phase velocity should be directed downwards for each of the Hough components is consistent with the dissipative effects of diffusion of momentum and heat. Also with this suggested boundary condition, the motion below is negligibly modified by changing the level at which the boundary condition is applied. (Author)

Descriptors :   *ATMOSPHERIC MOTION, *DIFFUSION, *EDDY CURRENTS, *EQUATIONS OF MOTION, MOMENTUM, DISSIPATION, BOUNDARIES, MATHEMATICS, PRESSURE

Subject Categories : Atmospheric Physics
      Numerical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE