Accession Number : AD0642402

Title :   A THREE-LEVEL NONLINEAR PREDICTION MODEL IN SPHERICAL COORDINATES,

Corporate Author : EMMANUEL COLL BOSTON MASS ORIENTAL SCIENCE LIBRARY

Personal Author(s) : Yung-t'i,Chu

Report Date : 1961

Pagination or Media Count : 32

Abstract : This paper applies theoretical results of works by Blinova and Chu Yung-t'i to formulate a three-level nonlinear prediction model in spherical coordinates to assess the effect of topography on the prediction of the isobaric field, the working levels being 1000, 500 and 300 mb. The auxiliary function L of the perturbation source function is computed from the contour fields at 1000, 700, 500, 300 and 100 mb by means of a system of localized rectangular coordinates. When t > 0, the L-field and the contour field are predicted 'in parallel' by a Eulerian method. An interpolation formula for the evaluation of the influence function (Green's function) and an approximation of the function in the neighborhood of a singular point are suggested. The proposed model has been programmed for computation on the large high-speed electronic computer (BESM-1) of the USSR Academy of Sciences and the numerical output analyzed. The results show that the proposed model is suitable for the hemispherical prognoses of the flow pattern as well as the surface pressure field for more than 24 hours. (Author)

Descriptors :   (*WEATHER FORECASTING, *MODEL THEORY), NUMERICAL ANALYSIS, TERRAIN, CHINA

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE