Study of factors affecting dust phenomenon in west of Iran

Subject Areas : Water and Environment

Siavash Taei Samiromi ¹ (MSc in Watershed Engineering, Tarbiat Modarres University, Tehran, Iran.)
Hamidreza Moradi ² (Associate Professor, Watershed Department, Taribiat Modarres, Tehran, Iran. (Corresponding Author))
Morteza Khadagholi ³ (Assistant Professor, Agriculture and Natural Resources Research Center, Isfahan,)
Maryam Ahmadi ⁴ (MSc in Watershed Engineering, Hormozgan University, Iran)

Received: 2013-04-30 Accepted : 2013-10-15 Published : 2013-12-22

Keywords: Dust phenomena, Meteorology, Synoptic maps, satellite images,

Abstract :

Dust is one of the destructive phenomena of climate that annually makes a lot of damage to theenvironment, roads, buildings and urban air. Western Province of Iran are susceptible places forfrequent occurrence of dust phenomenon. For this study the data of horizontal visibility and reporteddust phenomena of several meteorology stations in the western provinces were used. Afterdetermining the days with dust and their classification, we attempted to extracted maps of differentlevels of the meteorology International Centre from the NOAA. Finally, the maps and data of dustwere analyzed in the case study. The results showed that the reduction of soil moisture reduced due todecreasing precipitation over the past decade, particularly in the north the middle east, that is feedingregion's the major rivers of Mesopotamia and also, increasing frequency of the short waves and rapidwith strong wind-orbital are the main reasons of storms. It appears that on strengthening subtropicalhigh pressure on Saudi Arabia and simultaneously expanding and opening lines 588 D kamtrIntermediate levels causing increasing the speed of short waves and reduction moisture the advectionfrom high latitudes to the south of the study area. This mechanism reduces the depth of Mediterraneandescent wind conditions also triggers orbital and is weakened meridional currents. It also weakenedthe landing place to the Mediterranean and towards higher latitudes and raise subtropical high pressurecenter can be another reason for the displacement of dust to the north a source.

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