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Investigation of Vorticity during Prevalent Winter Precipitation in Iran

Investigation of Vorticity during Prevalent Winter Precipitation in Iran

Title: Investigation of Vorticity during Prevalent Winter Precipitation in Iran
Author: Rousta, Iman   orcid.org/0000-0002-3694-6936
Javadizadeh, Farshad
Dargahian, Fatemeh
Olafsson, Haraldur   orcid.org/0000-0002-4181-0988
Shiri-Karimvandi, Amin
Vahedinejad, Sayed Hossein
Doostkamian, Mehdi
Monroy Vargas, Edgar Ricardo
Asadolahi, Anayat
Date: 2018-09-30
Language: English
Scope: 6941501
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindadeild (HÍ)
Faculty of Physical Sciences (UI)
Series: Advances in Meteorology;2018
ISSN: 1687-9309
1687-9317 (eISSN)
DOI: 10.1155/2018/6941501
Subject: Veðurfarsrannsóknir; Veðurfarsbreytingar; Vindmælingar; Íran
URI: https://hdl.handle.net/20.500.11815/1101

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Rousta, I., Javadizadeh, F., Dargahian, F., #xd3, lafsson, H., Shiri-Karimvandi, A., . . . Asadolahi, A. (2018). Investigation of Vorticity during Prevalent Winter Precipitation in Iran. Advances in Meteorology, 2018, 13. doi:10.1155/2018/6941501


In this study, precipitation data for 483 synoptic stations, and the U&V component of wind and HGT data for 4 atmospheric levels were respectively obtained from IRIMO and NCEP/NCAR databases (1961–2013). The precipitation threshold of 1 mm and a minimum prevalence of 50% were the criteria based on which the prevalent precipitation of Iran was identified. Then, vorticity of days corresponding to prevalent winter precipitation was calculated and, by performing cluster analysis, the representative days of vorticity were specified. The results showed that prevalent winter precipitation vorticity in Iran is related to the vorticity patterns of low pressure of Mediterranean-low pressure of Persian Gulf dual-core, low pressure closed of central Iran-high pressure of East Europe, Ural low pressure-Middle East High pressure, Saudi Arabia low pressure-Europe high pressure, and high-pressure belt of Siberia-low pressure of central Iran. At the same time, the most intense vorticity occurred when the climate of Iran was influenced by a massive belt pattern of Siberian high pressure-low pressure of central Iran. However, at the time of prevalent winter precipitation in Iran, an intense vorticity is drawn with the direction of Northeast and Northwest from the center of Iraq to the south of Iran.


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