Accession Number : AD0704779

Title :   HYPERBAROCLINIC ZONES: NUMERICAL ANALYSIS AND APPLICATION TO FRONTS.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Renard,R. J.

Report Date : 23 MAR 1970

Pagination or Media Count : 202

Abstract : An objective-numerical scheme for locating and specifying the intensity of hyperbaroclinic zones (HBZs) is presented and applied in both research and operational environments. The operational model, called DGT*, employs the isobaric gradient of virtual potential temperature (T*) to specify baroclinicity while a directional second derivative of T* is the parameter used to locate the HBZs and indirectly give a measure of their intensity. The DGT* model is diagnosed from an analysis of modeled temperature profiles and a number of real-atmosphere temperature fields at 1000, 850, 700, and 500 mb, as taken from winter and summer situations in the years 1964-67. Consideration is given to location, intensity, frequency, slope, and vertical and horizontal distribution and consistency of the HBZs in relation to the numerical processing of data. A key synoptic time, 0000 GMT 6 March 1966, serves to exemplify analytical and diagnostic features of the HBZs. The numerically-analyzed 1000 mb fronts, produced operationally by Fleet Numerical Weather Central, Monterey, California since 1965, are statistically and graphically compared to subjectively-analyzed versions for winter and summer periods up to 30 days. The relation of the HBZ to vertical motion and cloud is illustrated by a case study from December 1966. (Author)

Descriptors :   (*AIR MASS ANALYSIS, MATHEMATICAL MODELS), DENSITY, BAROMETRIC PRESSURE, INTENSITY, MATHEMATICAL PREDICTION, CLOUDS, DATA PROCESSING, RADIOSONDES, STABILITY, NAVAL RESEARCH, CALIFORNIA

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE