Dust storms analysis in the Sistan region using DDI and DSI indices and wind speed, visibility and PM10 parameters

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MIRI A.

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Journal: Journal of Water and Soil Conservation Year:2020 | Volume:27 | Issue:1 Page(s): 1-23

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Title

Dust storms analysis in the Sistan region using DDI and DSI indices and wind speed, visibility and PM10 parameters

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MIRI A. | Issue Writer Certificate

Keywords

Dust stormsQ1

SistanQ2

VisibilityQ1

Wind speedQ1

Abstract

Background and Objectives: During the recent decades Dust storms have become serious natural hazards in the world. Although Dust storms have been investigated in various aspects, variation in Wind speed and Visibility and the frequency of Dust storms require more investigation. In this study, diurnal, monthly and yearly variation of parameters including Wind speed, Visibility and PM10 (particulate matter 10 micrometers or less in diameter) and frequency of Dust storms was studied in the Sistan region for the twenty seven-year period. Materials and Methods: Sistan in the southeast part of Iran is considered as the study area. Sistan has an arid and semi-arid climate with very low precipitation (59 mm) and humidity and high evaporation (nearly 4820 mm) and annual temperature (22 ° C). To analysis the diurnal, monthly and yearly variations of Wind speed and Visibility, the collected data at the Zabol meteorological station were obtained from the Iran Meteorological Organization for the study period. DDI (Dusty Days Index; the days with Wind speed more than 15 m/s and Visibility less than 1000 m) and DSI (Dusty Index) were applied in this study to analysis the monthly and yearly frequency of Dust storms during 1991-2018. Furthermore, the hourly concentration of PM10 was received from the meteorological and environmental stations of the respective centers during 2013-2018. Results: The results show that the diurnal variation of Wind speed, Visibility and PM10 was similar in all months during the study period. The highest PM10 concentration and lowest Visibility were observed at 10: 30 am in accords with highest Wind speed. The highest Visibility occurred at 7: 30 pm when PM10 and Wind speed were lowest. The highest DDI, DSI and PM10 values-8 days, 15 days and 662 𝜇 𝑔 𝑚 − 3 respectively, were observed in June. The highest DDI and dust storm duration-74 days and 3186 minutes (531 hours) were observed in 2001. The period of 1999-2004 is dustier than the periods of 1990-1999 and 2005-2018. DSI were 174, 14 and 66 days in these periods, respectively. Strong correlations were observed between Wind speed and Visibility, Wind speed and PM10 and, Visibility and PM10. These correlations show that PM10 and Visibility are dependent on Wind speed. Furthermore, positive correlations were observed between PM10 and Wind speed, DSI and Wind speed and DDI and Wind speed. These correlations indicate that variations of PM10, DSI and DDI are highly dependent on Wind speed. Conclusion: In the study period of 27 years, the Sistan region is dustier than other parts of Iran due to higher intensity and frequency of Dust storms in this region. Dustiness in the Sistan region is highly dependent on the situation of Hamoun Lake and thus the recovery of the lake is the best controlling approach to reduce the intensity and frequency of Dust storms.

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APA: Copy

MIRI, A.. (2020). Dust storms analysis in the Sistan region using DDI and DSI indices and wind speed, visibility and PM10 parameters. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 27(1 ), 1-23. SID. https://sid.ir/paper/377666/en

Vancouver: Copy

MIRI A.. Dust storms analysis in the Sistan region using DDI and DSI indices and wind speed, visibility and PM10 parameters. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2020;27(1 ):1-23. Available from: https://sid.ir/paper/377666/en

IEEE: Copy

A. MIRI, “Dust storms analysis in the Sistan region using DDI and DSI indices and wind speed, visibility and PM10 parameters,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 27, no. 1 , pp. 1–23, 2020, [Online]. Available: https://sid.ir/paper/377666/en

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