The Synoptic analysis of spring frosts Kermanshah(Cold Spring, 1391 and 1376)
Journal Title: Journal of Science and today’s world - Year 2014, Vol 3, Issue 7
Abstract
The effect of spring frost damage to crops is entered And since low temperatures are devastating effect on agricultural production, Evaluate their prediction for the prevention of damages will be extremely useful. Often very sudden changes in atmospheric temperature is due to the air passing through the system And plants can not adapt to the fluctuating And thus damaged. The purpose of this study, Synoptic patterns of sea level, 750 and 500 hPa Late spring frosts occurring over a period of 25 years To determine the time of occurrence of frost, Daily minimum temperature station in Kermanshah. Number of frost days is 110 days, Coldest 23 Persian date Farvardin 1376 for -6.1 C◦With 4 days of continued The most lasting frost between days 1 to 7 Persian date Farvardin 1391and -4.2 C◦temperature has continued to 7 days. The results showed that the power situation prevailing weather systems during the frost event, Controlling this phenomenon are considered. Also, the main synoptic pattern prevailing in the studied frost, Formation and a trough of low pressure caused by spring frosts, they play an important role in the region, Governing the movement of ascending and descending upon landing and short wave causes conduction system Synoptic cold air massDry relatively high latitudes of the northern and north-western Iran in the region And environmental degradation to has a freezing temperature.
Authors and Affiliations
Majid montazery, Ali Hassanzadeh
Keywords
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