EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Dust storm frequency in relation to extreme droughts in arid regions of Iran

reza modarres and Poria Mohit Esfahani
reza modarres and Poria Mohit Esfahani
  • Isfahan Univesity of Technology, Natural Resources, isfahan, Iran, Islamic Republic of (

Dust storms are frequent phenomenon in arid and semi arid regions of Iran which cover near 60 percent of the entire country in the center of Iran. Due to geographic and climatic conditions of prolonged dry conditions as well as poor land use management, dust storms occur in almost all seasons across the region. Drought is a major fator affecting the likelihood of dust storm occurrence across arid regions of Iran. We develop copula functions to investigate the effect of drought on dust storm frequency.The standardized precipitation Index (SPI) was caluclated and drought condition was defined based on SPI< -0.5. Dought severity and duration for each drought event were ca;culated and the number of dust days in each drought event ws also identified. The Archimedean copula families shoed that the probability of dust occurrence has a significant relationship to extreme drought conditions. The joint probability is then used to derive the joint return period of dust storms in relation to drought condition.

How to cite: modarres, R. and Mohit Esfahani, P.: Dust storm frequency in relation to extreme droughts in arid regions of Iran, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1810,, 2021.


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