Long-term changes of sudden stratospheric warmings
The analysis of the dynamics of parameters of stratospheric warming in the Northern Hemisphere from 1975 to 2013. In most cases, stratospheric warming observed over the Asia-Pacific region. Warming of this type of match type II stratospheric circulation classification U. B. Khrabrov. Overall, for the entire period from 1975 to 2013. Stable trend in temperature or geopotential values in the stratosphere during the warming was absent, but since the mid 90's intensity and spatial scale of the stratospheric warming declined, although in some years, for example, in 2009, warming has been very powerful.