Accession Number : AD0623116

Title :   FORMATION AND DESTRUCTION OF THERMAL WIND IN A SIMPLE BAROCLINIC ATMOSPHERE,

Corporate Author : EMMANUEL COLL BOSTON MASS RESEARCH LANGUAGE CENTER

Personal Author(s) : Chu-shih,Chen

Report Date : AUG 1965

Pagination or Media Count : 54

Abstract : This paper discusses the principle of vertical motion variations in the adaptation process of a thermal wind, using a simple two-layer baroclinic model. When the thermal wind vorticity in the wind field is larger than that in the temperature field, the ascending motion accelerates; otherwise, the descending motion accelerates. For the baroclinic system in the upper troposphere between 250 and 750 mb, the temperature field is adapted toward the wind field when the scale of the system is smaller than the critical scale L sub 0, and vice versa when the scale is larger than L sub 0. This is demonstrated by examples computed according to two horizontal scales, 1000 and 300 km, respectively. In the former scale, the adaptation is mainly toward the temperature field, and in the latter, toward the wind field. According to the contrast between the rates of formation and destruction of a thermal wind, the physical process of the formation of geostrophic and ageostrophic motions is described. Finally, the proposed method is applied to examine the baroclinic instability of long waves and then to clarify the vorticity mechanism of the baroclinic instability. (Author)

Descriptors :   (*WIND, THERMODYNAMICS), ATMOSPHERIC MOTION, CONVECTION, AIR MASS ANALYSIS, ATMOSPHERIC TEMPERATURE, ATMOSPHERE MODELS, METEOROLOGY, CHINA

Distribution Statement : APPROVED FOR PUBLIC RELEASE