Volume 10, Issue 4 (12-2023)
Journal of Spatial Analysis Environmental Hazards 2023, 10(4): 129-144 |
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chehreara T, Hajivand paydari S. Understanding the mechanism of the atmospheric anomalies governing the summer dust in northeast Iran. Journal of Spatial Analysis Environmental Hazards 2023; 10 (4) :129-144
URL: http://jsaeh.khu.ac.ir/article-1-3393-en.html
URL: http://jsaeh.khu.ac.ir/article-1-3393-en.html
Understanding the mechanism of the atmospheric anomalies governing the summer dust in northeast Iran
1- Qazvin, Payame Noor University , ta_ch_55_ir@yahoo.com
2- Kharazmi University of Tehran
2- Kharazmi University of Tehran
Abstract: (268 Views)
Identification of dust centers and, of course, the behavior of this phenomenon in different regions creates one of the problems of the last few decades, which is investigated as a hazard. To this end, statistics from 15 meteorological stations in the northeastern region of Iran, including North Khorasan, Razavi Khorasan, and South Khorasan provinces, were used over a 17-year period (2016-2000). To clarify the mechanisms governing dusty days, the meridional and zonal wind components and geopotential height were obtained by referring to the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR). HYSPLIT model and MODIS AOD values were used to track and identify dust centers. The results showed that during the warm season, due to the establishment of a strong quasi-stationary blocking system in the lower levels of the atmosphere, negative vorticity increased in the maximum air descent area, ultimately leading to the dominance of a northern flow for the region. Anomalies in geopotential height and vorticity were identified, and three dominant abnormal patterns were found in the occurrence of maximum dust storms in the region. An increase in geopotential height of more than 5 to 10 geopotential meters and an increase in negative vorticity are considered major conditions. By examining the tracking model and using satellite data, five main centers that affect over 90% of the region's dust storms were identified, among which Turkmenistan has a significant role with two separate centers and one common center with Uzbekistan in the occurrence of summer dust storms in northeastern Iran.
Type of Study: Applicable |
Subject:
Special
Received: 2023/09/20 | Accepted: 2023/12/18 | Published: 2024/04/28
Received: 2023/09/20 | Accepted: 2023/12/18 | Published: 2024/04/28
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