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

جغرافیا و مخاطرات محیطی

Article 5, Volume 10, Issue 3 - Serial Number 39, September 2021, Pages 83-104   

Document Type: Research Article

DOI: 10.22067/geoeh.2021.70187.1054

Authors

Meysam Toulabi nejad¹; Zahra Hejazizadeh^{* 2}; Anthony R. Lupo³; Mohammad Saligheh⁴

¹Ph.D. in Climatology, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran

²Professor, Department of Climatology, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran

³Professor of Atmospheric Sciences, Department of Soil, Environmental and Atmospheric Sciences, University of Missouri – Columbia, USA

⁴Associate Professor, Department of Climatology, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran

Abstract

The purpose of this study was to investigate the relationship between Eurasia-Northern Atlantic Blocking with wet and dry months in Iran. The research data were included monthly rainfall of 43 Iranian synoptic stations, geopultaneous height data, and Blocking components from 1973 to 2018. To study Blockings, the Blocking Index (BI) was used; ZSI index was used to extract dry and wet year months. To investigate the relationship between Blocking components with drought and wet year, Pearson correlation and multivariate regression were used. The results of rainfall data showed that dry months occurred almost 3 times higher than wet months. The results showed that Rex and cuts of low Blockings have the highest strength and severity in the North Atlantic region. The study of the monthly relationship of blocking components with wet and dry months showed that the relationship was more frequent and significant in the months. With the abundance and severity of the scouring of the trolley, they have also increased and whenever the intensity and abundance are less. Wet year had also dropped and dry months in Iran have grown. In terms of location, the nucleus formed between 30 and 55 degrees north and +30 to -30 in the Atlantic area have had the greatest effect on Iran's inclusive wet year, because the formation of blockings in the blue zone and more power to affect Putting the lands on their path. But whenever Blockings are formed during 50 to 90 degrees, the drought has increased more. The results of multivariate regression test between blocking components and wet year (drought) showed that the effect of blocking components on Iran's wet year was about 96% and drought was about 84%.

Keywords

Blocking systems; BI index; wet year; Drought; Iran

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