CONVERGENCE ROLE OF PRESSURE SYSTEMS ON THE OCCURRENCE OF SAND STORMS IN KHUZESTAN PROVINCE

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BARATI GH.; LASHKARI H.; KARAMI F.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

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Journal: Geography and Development Year:2011 | Volume:9 | Issue:22 Page(s): 39-56

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Information Journal Paper

Title

CONVERGENCE ROLE OF PRESSURE SYSTEMS ON THE OCCURRENCE OF SAND STORMS IN KHUZESTAN PROVINCE

Author(s)

BARATI GH. | LASHKARI H. | KARAMI F. | Issue Writer Certificate

Keywords

IRAN-PAKISTAN LOW PRESSUREQ2

AZOR HIGH PRESSUREQ2

DUST STORMQ2

KHUZESTANQ2

Abstract

Today, one of the controversial climate phenomenons is the DUST STORMs of west and south west part of Iran. In this study, through the review of horizon view of zero up to 1000m in six barometer stations of KHUZESTAN province during the years of 1995 up to 1999, the daily event of dust with id (6) was extracted. The first results represented the occurance of 288 DUST STORMs which all happened in the warm period of the year, i.e. from the end of April until September. From this group based on maximum durability and spatial spread, 10 index storms were determined, which through preparing and analyzing weather maps during dusty days, synoptic patterns of effective pressure systems in low and medium levels for the starting, peak and ending days of each storm were designed.Comparing the pattern of starting days of most of DUST STORMs with peak day of each storm at the level of open sea, indicates the simultaneous approaching of the two low pressure systems of Iran-Pakistan and high pressure system of Azor respectively from east and west of the under study area. Attainment of this approaching at high levels including 850 & 7oo Hecto pascal at the southeast of Iran which its results were the increase of pressure gradient and consequently atmospheric instability on KHUZESTAN, was coordinated with decreasing the horizon of view in most of the under study cities during the peak days. Also, extracting the wind direction from NCEP maps at elevation of 700 Hecto pascal and open level, confirms the occurance of north west air flows from east of Iraq and west air flows from north of Arabistan and thereby transferring dust from surface of naked deserts of this area.

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