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Title

IN TRACTION BETWEEN EAST KHORASAN WINDS REGIMES AND SISTAN 120 DAYS WINDS

Pages

 Start Page 19 | End Page 37

Abstract

 The main goal of this study is to investigate the inter action between East Khorasan winds regimes and Sistan120 Days winds. The climatic data of Synoptic stations used in the present study was obtained from khorasan razavi, khorasan Jon obi and Sistan and baluchestan meteorological organizations. The statistical period is from 2000 to 2011. To do synoptic analyses, the maps of sea level pressure, geo potential height of 850 Hectopascal level, wind direction and the relative vortices were used. The sample extract form the daily wind velocity data base of Zabol station and include the fourteen days with the highest velocity winds.The results shows that the wind direction in the Khorasan Razavi province is from north. While, the direction changes toward Northwest as it arrives to SISTAN PLAIN. This change in the direction of wind is due to the topography and geographical location of the area. The geo potential height maps shown that the main reasons for the winds of 120 days are the core of the high pressure on the Caspian Sea and the core of the low pressure in Pakistan. Moreover, strengthening the low pressure intensifies the winds.

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