Factorial Model of South Asia Low at Isobaric Level 925 hPa

Abstract

The paper examines seasonal atmospheric center of action – the South Asia Low, the predominant type of atmospheric circulation of the lower troposphere during the summer over the territory of the Near and Middle East. The characteristics of depression determine the weather and climatic conditions of the region, which may limit the actions of various consumers of meteorological information. The purpose of the work was to identify the features of the internal structure of depression. To achieve it, a statistical analysis of multidimensional data (period 1988-2017) of reanalysis of atmospheric parameters was carried out. The methods of factor analysis, clustering and correlation are used. In the first stage, model of the South Asia Low at 925 hPa level, including 10 predictors, was constructed; after information compression, transition to the factor model was made. As a result, clusters (types) of circulation objects were identified; the visualization of clusters on the factorial plane was presented; information value of common factors for surface air temperature in summer months was estimated. Model characteristics of structural objects of the generaltors for the diagnosis and forecast of the required meteorologicalin the work broadens the idea of the internal structure ofthe Near and Middle East.