Paper Information

Journal:   GEOGRAPHY AND DEVELOPMENT   WINTER 2011 , Volume 8 , Number 20; Page(s) 97 To 118.
 
Paper: 

SYNOPTICAL ANALYSIS OF DUST SYSTEM IN KHUZESTAN PROVINCE

 
 
Author(s):  TAVOUSI T., KHOSRAVI M., RAEISPOUOR K.
 
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Abstract: 

One of the natural disasters which affects on Khuzestan province for its geographical location and its vicinity with large zones of desert areas is the undesirable phenomenon of dust. This research has been performed after extracting 50 recognized dust systems and dividing them in to two periods of cold and hot periods of the year during statistical period of (1996-2005) by using combined maps of geo potential height, elevation 500 Hecto Pascal, medium pressure of sea elevation, wind vector maps, isospeed lines and air flow at two levels of 500 Hecto pascal and medium level of the sea at range 0 up to 50 northern degree and 0 up to 70 eastern degree and satellite photos for two recognized dust systems.
The results of this research shows that in the cold period of the year, migratory systems of westerlies (west winds) and polar front jet stream (PFJ) and in the hot period of the year, thermal low pressures of the earth surface are the main important factors in creation and formation of the said phenomenon in Khuzestan province. When deep pressure decrease occurs at the west part of the studied area in the deserts of neighboring countries and the wind speed reaches to jet stream wind, in case of availability of the environmental conditions, causes instability on the earth surface which produces dust and transfers it to Khuzestan province. Also In the hot periods of the year, thermal low pressures of the earth surface, especially Fars Gulf  low pressure through sucking the air of surrounding deserts (Arabian Peninsula) is one the main factors of dust creation.
Moving path of dust waves and manner of drop axis settlement and low pressure centers of the earth surface and also the used satellite photos show that the main sources of the entered dust in to Khuzestan province include southern desert of Iraq, North part of Arabian, south east of Syria and partly north of Africa desert.

 
Keyword(s): DUST, LOW PRESSURE, SATELLITE PHOTOS, PRESSURE MAPS, KHUZESTAN
 
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