Statistical-Synoptic Analysis of the Extreme Precipitation in Western Iran

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KIANI MEHRDAD; LASHKARI HASAN; Ghaemi Houshang

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Journal: Geography and Environmental Sustainability Year:2020 | Volume:9 | Issue:33 Page(s): 17-38

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Title

Statistical-Synoptic Analysis of the Extreme Precipitation in Western Iran

Author(s)

KIANI MEHRDAD | LASHKARI HASAN | Ghaemi Houshang | Issue Writer Certificate

Keywords

RainfallQ2

ExtremeQ1

SynopticQ1

PressureQ2

HumidityQ1

Abstract

Heavy daily Rainfall occurs when it exceeds the region's long-term average and becomes an Extreme event or climate hazard. The aim of this study is to provide the Synoptic and statistical analysis of the most intense daily precipitation in western Iran during a period from 1996 to 2017. To achieve this aim, Precipitation days with a maximum of 70 mm or more were specified and arranged according to the season. Finally, the most intense Rainfall events of each season were selected for the analysis. Based on results, the main area of heavy Rainfall is located on western slopes of Zagros, including Ilam and Marivan. In winter, the expansion of the Mediterranean system to the western Iran with accompaniment the Red Sea Humidity has been recognized as an essential factor for heavy Rainfall. In the spring, the formation of a Mediterranean cyclone on the Caspian Sea and the northwest of Iran has caused heavy Rainfall. The most intense Extreme Rainfall of all times have been observed in october and autumn, due to the convergence of the Mediterranean and Sudanese systems and the establishment of a cut-off low over the eastern Mediterranean at the middle level of the atmosphere. The deployment of high-temperature air mass on the Persian Gulf and Humidity advection from the southern seas and the Mediterranean have strengthened the system. The Jet stream in the atmosphere's mid-level played an important role in enhancing the convergence of winds and the low-Pressure pattern of the Earth's surface. Because, the flow of warm air ascend from the Earth's surface toward the middle of the atmosphere has been out of the area rapidly. Therefore, hot and humid wind currents are absorbed more rapidly towards the low Pressure center adjacent to the Earth's surface and with the release of latent heat, the air ascend to higher levels of the atmosphere.

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APA: Copy

KIANI, MEHRDAD, LASHKARI, HASAN, & Ghaemi, Houshang. (2020). Statistical-Synoptic Analysis of the Extreme Precipitation in Western Iran. GEOGRAPHY AND ENVIRONMENTAL SUSTAINABILITY, 9(33 ), 17-38. SID. https://sid.ir/paper/358654/en

Vancouver: Copy

KIANI MEHRDAD, LASHKARI HASAN, Ghaemi Houshang. Statistical-Synoptic Analysis of the Extreme Precipitation in Western Iran. GEOGRAPHY AND ENVIRONMENTAL SUSTAINABILITY[Internet]. 2020;9(33 ):17-38. Available from: https://sid.ir/paper/358654/en

IEEE: Copy

MEHRDAD KIANI, HASAN LASHKARI, and Houshang Ghaemi, “Statistical-Synoptic Analysis of the Extreme Precipitation in Western Iran,” GEOGRAPHY AND ENVIRONMENTAL SUSTAINABILITY, vol. 9, no. 33 , pp. 17–38, 2020, [Online]. Available: https://sid.ir/paper/358654/en

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