Accession Number : AD0270626

Title :   THE LARGE-SCALE PRESSURE-DRIVEN WIND FIELD

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : HOLL,MANFRED M.

Report Date : NOV 1961

Pagination or Media Count : 1

Abstract : This investigation stems from the consideration that the pressure field acts on the quasihorizontal motion of medium- and large-scale systems, in the sense of a forcing term at each level. The pressure-change mechanism is a vertically integrated effect, thus the coupling at each level is indirect. On this basis, the horizontal velocity distribution can be evolved for a level by prescribing the pressure field for that level, and, in this way, the initial velocity distribution evolves into a more realistic distribution in terms of its vorticity and divergence for these scales. The dynamicalnumerical experiments were designed to test a form of friction for the control of developments on a scale commensurate with the space discretization. The friction affords independent control of the diffusion rate of horizontal momentum and horizontal mass-divergence. A preliminary analysis indicates how the friction acts to control the shortest-period compression-gravity modes. The experiments indicate the validity of the reasoning. An initially geostrophic wind adjusts rather rapidly and appears to evolve a realistic divergence distribution. (Author)

Descriptors :   *MATHEMATICAL ANALYSIS, *WIND, AIR MASS ANALYSIS, ATMOSPHERES, VECTOR ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE