Large-scale driving mechanisms of the lowest and highest annual temperatures in northwestern Iran
Alizadeh, Omid ; Ghafarian, Parvin
The analysis of the daily observed temperature at five stations in northwestern Iran indicates an increasing trend in the highest annual temperature during the period 1980-2018. Based on the ERA5 data, the lowest annual temperatures in northwestern Iran are caused by the cold air advection from the north, accompanied by a lower than long-term average mid-tropospheric geopotential height and the development of a strong surface anticyclonic circulation. The highest annual temperatures in northwestern Iran are associated with the mid-tropospheric ridge building caused by the development of a cyclonic circulation over the Mediterranean Sea and a northward shift of the subtropical jet stream.</p>
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