The role of the lower layer of the Troposphere on a rain falling in the middle west of Iran

This project studies the relationship of rainfall with a thickness of the lower layer of the troposphere. Area between latitude 32.5 and 37 ıN in the Zagros Mountains in the central west of Iran was studied. Study of the long term period of rainfall elucidated seven synoptic stations of the central west of Iran. Two years of High rainfall and low rainfall and pervasive rainfall days of lower (up to 5 mm), medium (5 to 10 mm) and higher (more than 10 mm) for above months were selected from those years. Anomaly investigation on the average thickness of the atmosphere in Iran during this period to the long-term 66-yearold indicated that the annual average thickness has been more about 1.5 meters in the central west region in Iran. So the layer thickness (850-1000), temperature and specific humidity at the lower layer of the troposphere thickness in selected rainfall days in the central west region, it was shown that there was a thickness reduction at the rainfall day in 11 cases, thickness increment in 7 cases and no changes in 2 cases which remains constant. The amount of atmospheric thickness changes in the lower layer of the troposphere has not followed any specific trend and its changes and amount varied in different months. Also, the correlation of rainfall with the atmosphere thickness in the lower layer of troposphere in different seasons has not followed any specific trend and other conditions would be examined.