Evaluation of Vector Parameters of Wind and Its Role in Dust Storm in Iran’s Sistan

Document Type : Research Paper

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Abstract

The region of Sistan is one of the windy areas in the east of Iran.This study examines the wind vector parameters in Sistan. To do this, the data regarding daily, monthly and yearly wind speed and direction parameters of the dust in Zabol synoptic weather station (2008-1999) have been used. In order to analyze the route of dust storms Five most severe days  were chosen. Spatial coverage of the data was about northern 5 to 55 and eastern 10 to 100. The results show that during that period Sistan’s dust storms emanate from two active circulating systems. On the one hand, the system of the Caspian Sea in the North West region of Sistan due to its distribution moves the air from the center to the surrounding areas. On the other hand, a low system located in the South East of Sistan’s region intakes the air from around. Since this system has been located in East and Southeast of Sistan, in the north-south movement of air from high-altitude site located on the Caspian Sea to the northwest and it change to southeast-Northwest current.

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