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- W2256115792 abstract "Introduction According to the definition of World Meteorology Organization (WMO), as the speed of the air mass is more than 30 meters per second, the jetstream will arise. The core of the jetstream is with baroclinic atmosphere due to the large difference in temperature and wind speed. There are two west jetstreams in the northern hemisphere. The northern jet stream is called polar front jetstream and the southern is called subtropical jetstream. Polar Front Jet Stream produce intense temperature gradient by polar air mass and tropical Polar Front Jet Stream is produced by strong temperature gradient of polar and subtropical air. The subtropical jetstream is produced by temperature gradient in tropopause as limited to the upper troposphere. Subtropical jetstream situation is able to show a seasonal shift, this seasonal displacement of subtropical jet stream can cause the tropical and extra tropical alternative regimes on climate of Iran. The seasonal movement of extra tropical jetstream causes intermittent exposure regimes in tropical and extra tropical. When the jetstream is located over the south of Iran in the cold period of the year, extra tropical climatic factors enter into Iran such as westerliesand cyclones. While jet stream is in northern part of Iran in the warm period of the year, tropical climatic factors will enter Iran. Therefore, recognition of position of this phenomenon is necessary for detecting temporal changes of the other spatial atmospheric phenomena affecting the climate of Iran. On the other hand, possible behaviors in different situations can be recognized by accessing to the jet stream event. Studies have indicated that the mean latitude of the sub-tropical jet stream in both hemispheres have shifted toward the poles over the last few decades; while, the little changes in the jet stream position has huge effects on the distribution of temperature, precipitation and ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ E-mail: asakereh1@yahoo.com Cell: +98 9122416658 Ar ch iv of S ID" @default.
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- W2256115792 date "2015-01-01" @default.
- W2256115792 modified "2023-09-28" @default.
- W2256115792 title "TREND ANALYSIS OF THE RECENT SEASONAL CHANGES IN SUBTROPICAL JET STREAM IN CLIMATEOF IRAN" @default.
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