Accession Number : ADA116712

Title :   Identification of European Air Masses Using an Interactive Computer Technique for Separating Mixed Normal Distributions.

Descriptive Note : Master's thesis,


Personal Author(s) : Coleman,Cranston R , Jr

PDF Url : ADA116712

Report Date : Jan 1982

Pagination or Media Count : 53

Abstract : The interactive computer program developed here is a time and work saving extension of a partial collective method for examining air masses which was first introduced by Essenwanger (1954). The partial collective method is based on the assumption that frequency curves of conservative air mass properties, such as equivalent potential temperature, are comprised of a series of normal curves, each representing a different air mass. For the purposes of this study, the interactive computer method is applied to the analysis of fall and winter air masses over six European stations with examination of equivalent potential temperature at the surface, 850 mb (millibars), 700mb, and 500mb levels. Five major air masses are identified as affecting central Europe during the winter at the surface, 850mb and 700mb levels, and four air masses at the 500mb level. In the fall, six air masses are discernable at the surface and 700mb with five appearing at 850mb and 500mb. The computer technique which is used here to analyze European air masses is not limited to air mass analysis, but may be applied universally to the separation of mixed normal distributions.

Descriptors :   *Air mass analysis, *Computer programs, *Europe, Separators, Normal distribution, Atmospheric temperature, Surface temperature, Identification, Interactions, Mixtures, Weather stations, Theses

Subject Categories : Meteorology
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE