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2 A study on weather patterns and dust sources associated with sever dust events in the summer in the south west of Iran Ghahri* 1, F., Ranjbar Saadat Abadi 2, A. & Katiraie 3, P. S. 1, 3- Meteorology Dep., Islamic Azad University North Tehran Branch 2- Weather Center s Drought Dust as one atmospheric phenomenon has many important effects on environment, health, economy and social fields for entering dust particles into the atmosphere. Iran and western neighboring counties are located in the arid and semiarid belt of the world, where frequency of sever dust events, especially in south west Iran, has increased in recent years. In this paper, we investigated how this event is produced and reached to Ahwaz using observations and weather data of the period in selected summer month, based on sea level, 850hpa and 500hpa weather charts, surface wind field in the start and end days of dust occurrence in Ahwaz station. The results showed that in this period, dust events by high strength and frequency were occurred in July in Ahwaz, and the synoptic patterns that produce majority of severe dust over Ahwaz are Persian Gulf thermal trough extends to the north west of Iraq and European ridge extends over Black Sea and large parts of Turkey by passing waves of middle level Mediterranean trough north west of Iraq and east of Syria. Dust sources in northwest of Iraq and east of Syria have a major role in sever dust events in summer in south west of Iran. Keywords: dust event, atmospheric phenomenon, middle level trough, dust sources '> -!g '" h"!'" "! VM BAQ ) [N S! 77 S!!7?, /* " /I _h :! 3, U'.Youngsin et al., 2004) 1#*, 77 O6 /I '> 6 '3>_= '. "3" 38* C " <4 * R C4'8 7* '33Q6 _3O6.Wang1 2005) C! 7'> <* S3f /I '> 77 " Y/6' 3! 4.3/d Y!' M -4'8 " 77 S! ^ 4! '" R<? " 4 7 i *:! ;B" Y3O! '" h"! S 17: [N R 1 :! '4 " [! 7 1CK Y!' 4 74 jk 13!'QM k:6 > M :!.7" 4 '34 *"3" ld S3f 77 S! '<3" ^ *B4 CB S3f JM 77 S! X -!'33Q6.C! " Jd' ld Leng et al., )! <* #" _X!!7? S'<3".2002 H 73 J'K L, 4 C! M 77 :! /I '> C3..!H> M '" "N* N3O CB: 3* R<? 7"'4 S'>!'!'! <4 3!'QM *"3" # "! S3T #M R<? VM B"' 1U!' M :! B <4 JM J'I WX? "!'! 77 S! '=!7? M Y!'.C! 7 :?! M :! <4 J'I!7? Z*4'!@! 4 C!! M :!@3* 48 W? Y!' :!'\L] 77 S!.! # [* 77 S! 1^!@ "! 'H*!'/M -!B? A 4C! M.7*! _[* _8 R3!'6 M 1-B3]6 B6-9=< :'" `" 77 S! :! *! 3, != '=<A) '> '3I '> e? '> d'<3" B!@ R '3>_=.Romanoff, 1961) 7 S3f S3" R<? [N '" <!'>

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20 Romanoff, B Dust storm in Gobi and zone of Monoglia. The first PRC Monoglia workshop on climate change in arid and semiarid Region over the Central Asia. Wang, W, A Synoptic model on East Asian dust emission and transport, Atmospheric science and air quality conferences. Nankai University, Tianjin, China. Washangton, R.M., Tood, N., Middelton, J. & Goudie, A.S Global dust storm source areas determined by total ozone monitoring spectrometer and ground observations. Oxford University. UK. Youngsin, C.H. & Lim, J.Y The recent characteristics of Asian Dust and Haze events in Seoul. Meteorilogy and Atmospheric Physics, 87: