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Climate 2016, 4(3), 41; doi:10.3390/cli4030041

Statistical-Synoptic Analysis of the Atmosphere Thickness Pattern of Iran’s Pervasive Frosts

1
Climatology, Department of Geography, Yazd University, Yazd 8915818411, Iran
2
Climatology, Department of Geography, Zanjan University, Zanjan 3879145371, Iran
3
Climatology, Department of Geography, Tabriz University, Tabriz 5166616471, Iran
4
Geomorphology, Department of Humanities, Mohaghegh Ardabili University, Ardabil 5519911367, Iran
*
Author to whom correspondence should be addressed.
Academic Editor: Yang Zhang
Received: 18 July 2016 / Revised: 16 August 2016 / Accepted: 22 August 2016 / Published: 26 August 2016
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Abstract

The present study aimed at analyzing the synoptic pattern of atmospheric thickness of winter pervasive frosts in Iran. To this end, the data related to the daily minimum temperature of a 50-year period (1961–2010) were gathered from 451 synoptic and climatology stations. Then, the instances in which the temperature was below 0 °C for at least two consecutive days and this phenomenon covered at least 50% of the entirety of Iran were selected. Subsequently, the atmosphere thickness pattern was extracted for these days, with the representative day being identified and analyzed through cluster analysis. The results showed that the Siberian high pressure plays a significant role in the occurrence of pervasive frosts in Iran. In some other cases, the northeast–southwest direction of this pattern leads to its combination with the East Europe high pressure, causing widespread frosts in Iran. Furthermore, the interaction between counter clockwise currents in this system and the clockwise currents in the Azores high pressure tongue directs cold weather from northern parts of Europe toward Iran. The formation of blocking systems leads to the stagnation of cold weather over Iran, a phenomenon that results in significant reduction of temperature and severe frosts in these areas. In addition, the omega pattern (the fifth pattern) and Deep Eastern European trough and polar low pressure pattern (the fourth pattern) were the most dominant and severe frost patterns in Iran respectively. View Full-Text
Keywords: frost; synoptic pattern; atmosphere thickness; Iran frost; synoptic pattern; atmosphere thickness; Iran
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MDPI and ACS Style

Rousta, I.; Doostkamian, M.; Haghighi, E.; Mirzakhani, B. Statistical-Synoptic Analysis of the Atmosphere Thickness Pattern of Iran’s Pervasive Frosts. Climate 2016, 4, 41.

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