THE SYNOPTIC STUDY OF LOW PRESSURE SYSTEMS OF THE SUDAN IN HEAVY RAIN FALLS IN IRAN

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MOFIDI A.; ZARIN A.

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Journal: GEOGRAPHICAL RESEARCH Year:2005 | Volume:20 | Issue:2 (77) Page(s): 113-136

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Title

THE SYNOPTIC STUDY OF LOW PRESSURE SYSTEMS OF THE SUDAN IN HEAVY RAIN FALLS IN IRAN

Author(s)

MOFIDI A. | ZARIN A. | Issue Writer Certificate

Keywords

SUDAN LOWQ2

EASTERN MEDITERRANEAN DEEP TROUGHQ4

RIDGE OF EAST SAUDI ARABIAQ4

SUBTROPICAL JET STREAMQ3

POLAR VORTEXQ2

IRAN'S RAINFALLSQ4

Abstract

The evolution of Iran synoptic climatology studies, especially in the last decade has led to the recognition of low-pressure systems of the Red Sea region. First of all, the previous studies on the SUDAN LOW pressures were presented. Then the dominant synoptic patterns of 18 storms over Iran with the Sudan origin were extracted. In this case, the circulation patterns of the Earth surface and 850, 500, 200, 50 hpa levels before and after storms were investigated and the average patterns of each level were prepared. In order to recognize the main moisture source of the Sudan systems, wind speed and direction charts and specific humidity charts of 850hpa level for 18 storms were investigated and average charts of wind patterns and specific humidity of them were prepared. Also, cloud forms of satellite images associated with wind pattern of 200hpa level for 6 storms with the Sudan origin were analyzed. The result showed that although, like previous studies, there was low cycle index and the existence of a ridge in mid-troposphere over the west Mediterranean and a deep trough over the east Mediterranean had important role on the formation and evolution of the SUDAN LOW; the main role belonged to the stretching of POLAR VORTEX in lower stratosphere as the main source of vorticity for abnormal circulation and strengthening of Hadley cell and SUBTROPICAL JET STREAM over the Mediterranean and North of Africa. The results indicated that the suitable position of SUBTROPICAL JET STREAM core over Middle East associated with the settlement and strengthening of a ridge in middle and lower troposphere over the Arabian Sea are necessary for the evolution and developing of the SUDAN LOWs. However, the position and speed of SUBTROPICAL JET STREAM core over the Middle East and its axis direction in the upper troposphere control both the mid-tropospheric circulation pattern and the tracks of incoming SUDAN LOWs to Iran. Finally, it was noticed that the maximum frequency of the SUDAN LOWs in Iran was first related to December and then during winter. It seemed that the increasing of the number of the Sudan systems was related to rapid displacement and southward movement of SUBTROPICAL JET STREAM in Middle East in December. Moreover, it was found that the main sources of moisture of the Sudan systems are tropical Atrica (Southeast Sudan and west Ethiopia) and southwest sector of the Arabian Sea. The maximum moisture that reached Iran was seen in southwest Iran, particularly over Kohkilooyeh and Boyerahmad, Chaharmahal and Bakhtiyari provinces.

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APA: Copy

MOFIDI, A., & ZARIN, A.. (2005). THE SYNOPTIC STUDY OF LOW PRESSURE SYSTEMS OF THE SUDAN IN HEAVY RAIN FALLS IN IRAN. GEOGRAPHICAL RESEARCH, 20(2 (77)), 113-136. SID. https://sid.ir/paper/29958/en

Vancouver: Copy

MOFIDI A., ZARIN A.. THE SYNOPTIC STUDY OF LOW PRESSURE SYSTEMS OF THE SUDAN IN HEAVY RAIN FALLS IN IRAN. GEOGRAPHICAL RESEARCH[Internet]. 2005;20(2 (77)):113-136. Available from: https://sid.ir/paper/29958/en

IEEE: Copy

A. MOFIDI, and A. ZARIN, “THE SYNOPTIC STUDY OF LOW PRESSURE SYSTEMS OF THE SUDAN IN HEAVY RAIN FALLS IN IRAN,” GEOGRAPHICAL RESEARCH, vol. 20, no. 2 (77), pp. 113–136, 2005, [Online]. Available: https://sid.ir/paper/29958/en

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