A study on dust event over Kermanshah station and its relation to jet stream, March 27, 2003

Subject Areas : Marine Physics

N. Seyedzadeh Agdam ¹ ( Dep. Meteorology, Faculty of Marine Science and Technology, Islamic Azad University, North Tehran Branch )
P. S. Katirai ² ( Dep. Meteorology, Faculty of Marine Science and Technology, Islamic Azad University, North Tehran Branch )
A. Ranjbar Saadat Abadi ³ ( Weather Center of Drought )

Received: 2011-10-09 Accepted : 2012-05-23 Published : 2012-09-20

Keywords: dust, horizontal visibility, wind velocity, jet stream, spatial axis, Kermanshah Station,

Abstract :

This study was on dust in Kermanshah synoptic station in March 27, 2003. Mean daily 500hpa geopotential height, mean sea level and 250hpa wind field maps analysis showed a middle atmospheric trough over Black Sea and the north of the Mediterranean Sea which is consistent with a middle atmospheric low pressure over Iraq, east of Turkey and north of Saudi Arabia. In addition, the divergence of subtropical jet stream in 200hpa level and polar front jet stream in 250hpa level is the most important reason for convergence and induced upward motions over deserts in Iraq, Syria and Jordan, between 35-50 ° longitudes and 30-35 ° latitudes. The intensity of dust was related to the vertical angle between the center of the surface low pressure and 500hpa level low geopotential height.