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In order to study the relation between the components of atmosphericcirculation and summer precipitation over the Iranian plateau, daily rainfalldata of synoptic stations of Iran were obtained from IRIMO for the period 1970to 2003. Composite maps of different components such as pressure levels, vectorwind, U and V winds, vertical velocity, Specific humidity, OLR, streamlines,vorticity, and the temperature was drawn and analyzed. The results showed thatthe summer circulation of the atmosphere over South West Asia after a suddenchange from late May to early June was established in its normal position.Different new pressure systems such as Zagros Trough were identified over thesurface and the Turkmenistan Anticyclone, the quasi-stationary trough of eastTurkey at 700 hPa level. During the establishment of Subtropical High Pressurein the middle and upper troposphere over Iran, the summer circulation ofsouthwest Asia reached its highest intensity and expansion and continued tomid-August. On the other hand, the establishment of the TurkmenistanAnticyclone and Pakistan Low caused the 120 days winds of Sistan, and thedevelopment of High pressure over the Arabian Peninsula and Zagros Troughresulted in the Shomal wind. The main region of summer precipitation wasidentified as a triangular area to the east of 58.30 E and south of 28.30 N.Synoptic patterns responsible for the summer precipitation of the area aregrouped into four categories as Iran low pressure, Monsoon Depression, Pakistanlow pressure, and local convective cells. Iran low pressure was responsible formore than 65 percent of summer rainfall, while the Monsoon and Pakistan lowsproduced only 15 percent of the rain. Most of the moisture of rain generatingsystems came from the west of Oman sea and the northwest Arabian sea via thesouthwesterly flow below 850hPa level.

The Analysis of Summertime Atmospheric Circulation over Iran and its relation to Summertime Precipitation In Iran Plateau