CIRCULATION PATTERNS OF THE MONSOON RAINS DURING JULY 1994 OF IRAN

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ALIJANI BOHLOL; JAFARPOUR ZAINOLABEDIN; ALIAKBARI BIDOKHTI ABBAS ALI; MOFIDI ABBAS

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Journal: JOURNAL OF GEOGRAPHICAL SCIENCES Year:2008 | Volume:7 | Issue:10 Page(s): 7-38

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Title

CIRCULATION PATTERNS OF THE MONSOON RAINS DURING JULY 1994 OF IRAN

Author(s)

ALIJANI BOHLOL | JAFARPOUR ZAINOLABEDIN | ALIAKBARI BIDOKHTI ABBAS ALI | MOFIDI ABBAS | Issue Writer Certificate

Keywords

SOUTH EAST OF IRANQ2

MONSOON RAINSQ2

SYNOPTIC PATTERNS OF MONSOON RAINSQ3

STREAN FUNCTION ANALYSIS AND MONSOON RAINSQ3

Abstract

In order to understand the pressure patterns cauaing the summer MONSOON RAINS in the SOUTH EAST OF IRAN, daily values of pressure and wind components of 500, 700, and 850 hectopascal levels and sea level were obtained from NCEP site and daily rain data of 152 stations of Iran were provided by the Islamic Republic of Iran Meteorological Organization for 1970-2003 period. Spatial analysis of the rain data showed that there is a triangular area in the southeast of the country located to the east of 58:30 E and south of 28:30 N which gets rain every summer. This area is called an index area of MONSOON RAINS in Iran. The temporal analysis of the monthly rainfall of this index area indicated the June 1994 as the highest and most widespread rainfall during the study period. This study analysed the synoptic patterns causing this intensive rainfall period through the different atmospheric levels at the daily to seasonal scales.The results showed that: The Subtropical High Pressure was stronger and expanded east ward over India at the higher levels. At the same time at the lower levels the monsoon depression was expanded west ward over Arabian Sea creating positive vorticity over the area and making it possible for the air to ascend. The tropical easterly cyclones intruded the southeast of Iran in July1994 more than the other similar months. The westerly trough was deepened over the west of Iran. The south-westerly winds of Arabian Sea and Bay of Bengal became stronger. All these patterns and configurations caused the expantion of MONSOON RAINS to Iran and as a result very intensive rain happened over the area.

Cites

INVESTIGATING THE SYNOPTIC PATTERNS EFFECTIVE IN DROUGHT AND WET YEARS IN CENTRAL IRAN

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APA: Copy

ALIJANI, BOHLOL, JAFARPOUR, ZAINOLABEDIN, ALIAKBARI BIDOKHTI, ABBAS ALI, & MOFIDI, ABBAS. (2008). CIRCULATION PATTERNS OF THE MONSOON RAINS DURING JULY 1994 OF IRAN. JOURNAL OF GEOGRAPHICAL SCIENCES, 7(10), 7-38. SID. https://sid.ir/paper/102463/en

Vancouver: Copy

ALIJANI BOHLOL, JAFARPOUR ZAINOLABEDIN, ALIAKBARI BIDOKHTI ABBAS ALI, MOFIDI ABBAS. CIRCULATION PATTERNS OF THE MONSOON RAINS DURING JULY 1994 OF IRAN. JOURNAL OF GEOGRAPHICAL SCIENCES[Internet]. 2008;7(10):7-38. Available from: https://sid.ir/paper/102463/en

IEEE: Copy

BOHLOL ALIJANI, ZAINOLABEDIN JAFARPOUR, ABBAS ALI ALIAKBARI BIDOKHTI, and ABBAS MOFIDI, “CIRCULATION PATTERNS OF THE MONSOON RAINS DURING JULY 1994 OF IRAN,” JOURNAL OF GEOGRAPHICAL SCIENCES, vol. 7, no. 10, pp. 7–38, 2008, [Online]. Available: https://sid.ir/paper/102463/en

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