Synoptic systems analysis took occurrence of heavy snow in the northern provinces of Iran A case study is January 31 to February 3, 2014

Document Type : Original Article

Authors

1 Assistant professor of Climatology, Department of Geography and Environmental Sciences, Hakim Sabzevari University.

2 Master of Science student of Climatology, Department of Geography and Environmental Sciences Fedrdowsi University

Abstract

To study the precipitation of heavy snow in the north, the National Weather Service reports that snow days were used. According to the equivalent of 1.5 to 2 meters of snow in 4 days and more than 3 meters in some areas is revealed. Continuing to analyze the rainfall causing circulation patterns of temperature data, in heights, sea level pressure, and sea surface temperature component orientation and zonal wind 2.5 × 2.5 degree resolution of the website National Center for environmental prediction and atmospheric Sciences America (NCEP / NCAR) obtaining and synoptic maps were prepared. The results showed that in the event of heavy snow, up the East side and surface pressure in the area of East Europe and the establishment of a barrier system at 500 hPa in the region and a very deep trough in the Caspian Sea with the NE-SW West Brewer cause has been positive vorticity area below and instability is caused due to snow fall. The sea surface temperature anomalies in the southern part of the lake, which has reached more than 2 ° Centigrade due to the transfer of moisture to the cold air mass into the area and caused the extreme temperature gradient has been that the formation of the Front in the Caspian area . The situation is such that the curve of the polar vortex in January and February, exactly on the region and situation has escalated.

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References

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Iran-Water Resources Research
Volume 13, Issue 2
September 2017
Pages 1770-181

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History

  • Receive Date: 17 August 2016
  • Revise Date: 13 February 2017
  • Accept Date: 13 February 2017

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