Climatic Regionalization of Yazd Province Using Multivariate statistical Methods

One of most effective factors on life of an area is its climate type so that dispersion of types of plants and animals has a tight relationship with climatic condition of every area¡thus understanding of climate type of an area and effective elements that are determinant of climate of that area is preferable so climatic division or understanding of climatic flattening is sensory for planning in order to optimal exploitation and area utilization. Hence the purpose of this study is to identify environmental powers and the most important climatic elements influencing on climate of yazd and to separate locally climatic sub areas of yazd by using modern statistical methods. In this article, climatic Regionalization of yazd is performed by multivariate methods and features of every climate is separately stated. For accessing to this purpose, statictcal data of 28 atmospheric variables related to 25 barometric stations were elicited from aerology organization, that they provided annual average of 27 climatic elements of 25 barometric stations of yazd. This matrix was averegged 25×27 as small as cell (pixcel) 15×15 kilometric by kriching method and changed to matrix 27×579. Then modern methods based on base components analysis and cluster analysis techniques were used¡ by applying base components analysis on matrix, correlation of data matrix showed that we can describe 99/3 % dispersion of data by six components. First component is humidity- windy elements determine the highest dispersion of data (43/8) that quantity profile of yazd is shown as following by this method according to importance of element: Temperature-humidity component, precipitation-humidity component, dusty component, windy component. By applying hierarchical cluster analysis and integration method on score of components, climate areas of yazd were divided to six areas including: 1- moderate and relativly arid climate of Abarkooh - Harat 2- moderate and arid and dusty climate of Shirkuh 3-Semi warm and hyper arid climate of Yazd_Bafgh 4-warm, hyper arid and dusty climate of Tabas 5-Semi warm and arid climate of Dastgerdan 6- Semi warm and arid climate of Dey hook.