A SYNOPTIC ANALYSIS FOR THE OCCURRENCE OF SPRINGTIME HEAVY RAINFALL IN THE NORTHWEST OF IRAN

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KHORSHIDDOUST ALI MOHAMMAD; MOFIDI ABBAS; RASULI ALIAKBAR; AZARM KAMEL

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Journal: JOURNAL OF NATURAL ENVIRONMENT HAZARDS Year:2016 | Volume:5 | Issue:8 Page(s): 53-82

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Title

A SYNOPTIC ANALYSIS FOR THE OCCURRENCE OF SPRINGTIME HEAVY RAINFALL IN THE NORTHWEST OF IRAN

Author(s)

KHORSHIDDOUST ALI MOHAMMAD | MOFIDI ABBAS | RASULI ALIAKBAR | AZARM KAMEL | Issue Writer Certificate

Keywords

CHIRPSQ1

HEAVY PRECIPITATIONQ1

SYNOPTIC CLIMATOLOGYQ2

NORTH WEST OF IRANQ1

Abstract

The main purpose of this research is synoptic analysis for the occurrence of springtime heavy rainfall in the Northwest of Iran. Therefore, daily precipitation data were obtained from 15 synoptic stations for a period of 34 years (1981-2014). Then by using percentile index of above 95th, it was identified 98 days with HEAVY PRECIPITATION. So, to determine the synoptic patterns by applied the NCEP/NCAR reanalysis dataset, the maps of geopotential height, sea level pressure, streamlines, vorticity, and specific humidity at different levels were prepared and the regional pattern flow and atmospheric conditions two days before the occurrence of precipitation analyzed. The results indicate that HEAVY PRECIPITATIONs in NORTH WEST OF IRAN are categorized into four synoptic patterns. At the first pattern, the main cause of HEAVY PRECIPITATION in North West is passing cyclone or low-pressure migratory systems and the regional dynamic convergence and its association with cyclonic circulation. The main factor for the transferring of moisture to the inner side of these cyclones is the anti-cyclone stationed in Saudi Arabia. At the second pattern, the couple blocking system in the middle level of troposphere system is caused HEAVY PRECIPITATION with stop-motion circulation systems in the middle and lower levels of the atmosphere. At the third pattern, a deep cyclonic circulation center has not been formed on their area and seems deepening a trough of extratropical and stimulates the local convergence condition dynamically, and is regarded as the main mechanism of precipitations occurrence. The main mechanism of the fourth pattern is the establishment of the omega-blocking system in mid-latitudes. In fact, at omega blocking pattern, Cut-off Low located on the western side blocking system with the establishment and the shelf life of a few days on the zone has caused the HEAVY PRECIPITATION.

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APA: Copy

KHORSHIDDOUST, ALI MOHAMMAD, MOFIDI, ABBAS, RASULI, ALIAKBAR, & AZARM, KAMEL. (2016). A SYNOPTIC ANALYSIS FOR THE OCCURRENCE OF SPRINGTIME HEAVY RAINFALL IN THE NORTHWEST OF IRAN. JOURNAL OF NATURAL ENVIRONMENT HAZARDS, 5(8), 53-82. SID. https://sid.ir/paper/259182/en

Vancouver: Copy

KHORSHIDDOUST ALI MOHAMMAD, MOFIDI ABBAS, RASULI ALIAKBAR, AZARM KAMEL. A SYNOPTIC ANALYSIS FOR THE OCCURRENCE OF SPRINGTIME HEAVY RAINFALL IN THE NORTHWEST OF IRAN. JOURNAL OF NATURAL ENVIRONMENT HAZARDS[Internet]. 2016;5(8):53-82. Available from: https://sid.ir/paper/259182/en

IEEE: Copy

ALI MOHAMMAD KHORSHIDDOUST, ABBAS MOFIDI, ALIAKBAR RASULI, and KAMEL AZARM, “A SYNOPTIC ANALYSIS FOR THE OCCURRENCE OF SPRINGTIME HEAVY RAINFALL IN THE NORTHWEST OF IRAN,” JOURNAL OF NATURAL ENVIRONMENT HAZARDS, vol. 5, no. 8, pp. 53–82, 2016, [Online]. Available: https://sid.ir/paper/259182/en

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