Connection of Eurasia-Northern Atlas Blockings with Pervasive wet and dry months in Iran

The purpose of this study was to investigate the relationship between Eurasia-Northern Atlas Blockings with more months and dry years in Iran. For this research, rainfall data from 43 synoptic stations in Iran, geopultaneous geopultaneous height data were used and blocking components from 1973 to 2018. To check the blockings, the Blocking intensity index (BI) was used. The extraction of dry and more comprehensive months of ZSI index was used. The results of rainfall data showed that dry months have occurred almost 3 times more than more months, and the rapping of low pressure and low pressure have had the highest strength and severity in the North Atlantic region. The monthly relationship between blocking components with more months showed that the relationship was more months with abundance and severity. With the abundance of the frequency and severity of the casters, they have also increased, and whenever the severity and frequency are lower, Courses in Iran have also been reduced and dried months have grown in Iran. In terms of location, the nucleus formed between 30 and 55 degrees north and 30 + 30 - in the Atlas area have had the greatest effect on Iran's inclusive frustrations, because the formation of blockings in the blue zone is more energy and more power. But whenever Blockings are formed during 50 to 90 degrees, drought has increased. The results of multivariate regression test between blocking and tractory components (drought) showed that the effect of blocking components on Iran's wrapes was about 96% and drought was about 84%.