عنوان مقاله [English]
In this study examines the spatial subtropical high pressure stack over the region of Iran. To do this the data re-analyzed center monthly average NCEP / NCAR were used with a resolution 2.5 degree.The data of geopotential height, meridional wind component for the time 12GMT during 52 years (1340-1391) of 600,700 and 500 hPa levels to assess the position of the stack and its frequency properties in the range -10 degrees west longitude 120 ° East during the warm period year (July, August, September) were studied. The results show that the stack during summer months at all three levels the stack, in August, the highest latitude of reached. Maximum expansion of the orbital stack line of subtropical high pressure the level of 500 hPa to 700 hPa level is the lowest. The results clarified the independent showed that the high pressure stack on Iran in the 700 hPa level of stability and a special focus in a certain area (northeast), And the two higher level stack to the south West's position shifted. These results clarified the independent nature of Iran subtropical high in the middle and troposphere.