The Mechanism Analysis of Thermal Waves in the West and Southwest of Iran

Thermal waves are one of the consequences of increasing the temperature in the climatic system. The west and southwest of Iran are among the areas that have been exposed to thermal waves in the summer in recent years. Thermal waves of the area were identified using Baldi Index of daily maximum temperature data from 36 meteorological stations. Also, the coherent conditions of thermal waves were analyzed using geo-potential height, sea level pressure, vertical vortices, U wind and V wind at 1000 to 250 hp in a 6-hour interval from the NCEP / NCAR data series. According to Baldi index, the long-term thermal wave covers the western stations of the country from 2/07/2010 to 13/07/2010. The analysis of synoptic maps showed that thermal waves were formed with the establishment of Persian Gulf and Gang low pressure thermal systems with humidity, the establishment of blocking systems at 500HPS level by expanding the Azor dynamic high pressure, negative deflections, and STHP up to the Caspian Sea shores. Increasing evapotranspiration, water need, electricity consumption and the power transfer network deterioration, and reducing climatic welfare are the consequences of the establishment of synoptic conditions. Also, the integration of low-pressure Persian Gulf waves with Monsoon waves of the subcontinent, the establishment of the Azor dynamic high-pressure, and the creation of a blocking system on the area are the consequences of existing thermal waves over the region.