This research has been conducted with the aim of identifying heat waves in Ardabil province and analyzing their synoptic patterns using a circular method. For this purpose, the daily average maximum temperature data of Ardabil, Parsabad and Meshkinshahr synoptic station
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This research has been conducted with the aim of identifying heat waves in Ardabil province and analyzing their synoptic patterns using a circular method. For this purpose, the daily average maximum temperature data of Ardabil, Parsabad and Meshkinshahr synoptic stations were used in the statistical period of 1980-2020. The 95th percentile index was determined as a criterion for identifying a hot day, and its duration of at least 3 days was considered as the basis for defining a heat wave. Examining the trend of SLP, HGT and Tmax of these waves showed that on the hottest days of heat waves, the trend of SLP is downward and the trend of HGT and Tmax is upward. Clustering of heat wave generation patterns based on reanalysis data of sea level pressure and geopotential height of 500 hectopascals using cluster analysis method and Ward's clustering method led to the identification of 5 clusters which were presented in two main groups. In the first pattern, low pressure on the ground surface and high pressure in the middle level of the atmosphere, and in the second pattern, the location of the studied area in the west of the pseudo-Omega blocking of western Russia at the level of 500 hectopascals were identified as the synoptic factors of creating heat waves in Ardabil province. The common feature of both patterns is the high thickness of the atmosphere over the region on the days of this event.
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