Paper Information

Journal:   RESEARCH BULLETIN OF ISFAHAN UNIVERSITY (HUMANITIES)   2007 , Volume 22 , Number 1; Page(s) 85 To 100.
 
Paper: 

NORMAL GENERAL CIRCULATION AND CHARACTERITICS PARAMETERS OF CENTER OF ACTION IN WINTER ON IRAN

 
 
Author(s):  SHAHROKH VANDI S.M., GHAYUR H.A., KAVIANI M.R.
 
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Abstract: 

It is normal located in a subtropical high pressure condition at 30oN and 30oW and its maximum effective extend is in the Eastern Half to 30oE.The Iceland low pressure is in 60oN and shows an obvious contrast with STHP (subtropical high pressure). The condition of the two systems pressure and the pressure differential between the latitudes 35oN and 55oN bring about the ZI and NAO indices. According to the ZI, the normal circulation in a long period is a zonal pattern. The general orientiation of the axis extension in the systems is Westrn-Eastern. These systems have moved a little from their normal condition toward the North east. Study in to the normal maps showes that the frequency of the Siberian high pressure Balkhash and Altaic establishment pattern is more than that of the oher patterns. Between the Siberian high pessure hectopascal isopessure 1017.5 subtropical high pressures, the east Mediterranean trough has developed 30o to 40oE. This trough is located approximately a long the red sea trough. Sudenes the Soudense low pressure is located at 10oN and 20oE.The normal movement inclination of the systems is more often toward the North-Eastern red sea than the Eastern Mediterranean sea. The average with drawals of the subtropical high height and the polar vortex to the Southern latitudes are up to 15oN and 38oN respectively. At the 850 and 700 hectopascal levels, the subtropical high height divides in to two cells. The Mediterranean Eastern trouigh at the 500 hectopascal level has been deepended between the to Western and Eastern cells of the subtropical high height and a long the maximum advancing of the polar vortex. The average thickness of the atmosphere in the coutry is 5650 hgt/m. Most of the wet year period in the country coincides with the thickness decrease.

 
Keyword(s): CENTER OF ACTION
 
References: 
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