Synoptic and thermodynamic patterns of atmospheric rivers associated to heavy precipitation in the cold period of Iran

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LASHKARI HASSAN; Esfandiari Neda

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Journal Paper

Paper Information

Journal: JOURNAL OF NATURAL ENVIRONMENT HAZARDS Year:2021 | Volume:10 | Issue:29 Page(s): 125-144

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Information Journal Paper

Title

Synoptic and thermodynamic patterns of atmospheric rivers associated to heavy precipitation in the cold period of Iran

Author(s)

LASHKARI HASSAN | Esfandiari Neda | Issue Writer Certificate

Keywords

Synoptic patternQ2

Atmospheric riversQ1

Heavy precipitationQ2

IranQ2

Abstract

The atmospheric river is an almost emerging phenomenon in the modern scientific literature of the world that has been studied due to its association with weather extreme events, especially heavy rainfall and floods. In this study, the integrated vertical vapour transport data were used to identify Atmospheric rivers and the criteria were determined for its separation from daily fluxes. The 90th percentile of daily precipitation was then considered as the criterion for Heavy precipitation across the country. Dates associated with Heavy precipitation in the presence of Atmospheric rivers were obtained, and its patterns were extracted by factor analysis after preparation of a 107×1190 matrix from 1000 level Geopotential height. The results showed that the first three factors account nearly about 70% of the total variance. Overall, Sudan's low-pressure system have an undeniable role in the formation of Atmospheric rivers and Heavy precipitation. In Sudan's low-pressure and the Mediterranean combination pattern, the most effect was on south-west and west of the country. Sudan's low-pressure and Eastern Europe cyclone combination pattern encompass the wider parts of the country. The influence of such systems on the country was more than other patterns. In the low-pressure combination pattern of Sudan and the migratory cyclone, the rivers and Heavy precipitation zones did not much extend to the northern latitudes. In terms of formation, in all patterns, the Sudan low-pressure and the Siberian High Pressure were played a major role in the gradient generation and moisture transfer to the Atmospheric rivers, in the low levels of the troposphere. The sources of moisture in these layers were the Oman-Arabian Sea.

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APA: Copy

LASHKARI, HASSAN, & Esfandiari, Neda. (2021). Synoptic and thermodynamic patterns of atmospheric rivers associated to heavy precipitation in the cold period of Iran. JOURNAL OF NATURAL ENVIRONMENT HAZARDS, 10(29 ), 125-144. SID. https://sid.ir/paper/410027/en

Vancouver: Copy

LASHKARI HASSAN, Esfandiari Neda. Synoptic and thermodynamic patterns of atmospheric rivers associated to heavy precipitation in the cold period of Iran. JOURNAL OF NATURAL ENVIRONMENT HAZARDS[Internet]. 2021;10(29 ):125-144. Available from: https://sid.ir/paper/410027/en

IEEE: Copy

HASSAN LASHKARI, and Neda Esfandiari, “Synoptic and thermodynamic patterns of atmospheric rivers associated to heavy precipitation in the cold period of Iran,” JOURNAL OF NATURAL ENVIRONMENT HAZARDS, vol. 10, no. 29 , pp. 125–144, 2021, [Online]. Available: https://sid.ir/paper/410027/en

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