Analysis of the Droughts in the Southern coastal areas of the Caspian Sea.

Subject Areas : Geopolitic

بهلول Alijani ¹ ( ندارد )
زین العابدین Jafarpoor ² ( ندارد )
GH Janbaz ³ ( ندارد )

Received: 2015-01-14 Accepted : 2015-01-14 Published : 2005-10-23

Keywords: Drought analysis, Southern Coast of the Caspian , weather types, statistical and synoptic analy,

Abstract :

In order to analyze the statistical and synoptic characteristics of the droughts inthe Southern Coastal region of the Caspian Sea, the monthly precipitation data wereanalyzed for the period 1961-99. The drought was identified according to deciles and Zindices. The synoptic origin was determined from The surface and 500 hPa NCEPdigital data. The results showed:1. The two month drought periods are frequent and most of the droughts are severand widespread.2. Three weather types responsible for the droughts are: zonal type, High pressureover the Caspian Sea, and low pressure system. All these types prevented the northerlyor northeasterly cold rain bringing winds over the Caspian Sea.