LONG-TERM FLUCTUATIONS OF NORTHERN HEMISPHERE ATMOSPHERIC CIRCULATION ACCORDING TO DZERDZEEVSKII’S CLASSIFICATION

The long-term series of fluctuation of monthly and annual Northern Hemisphere atmospheric circulation in non-tropical latitudes from 1899 to 2008 according to Dzerdzeevskii classification have been discussed. The differences in atmospheric circulation between circulation epochs have been identified. The circulation and climatic characteristics of extreme decades of circulation epochs in the Northern Hemisphere and its six sectors—Atlantic, European, Siberian, Far East, Pacific, and American—have been given. The recent, the 1981–2007 period, is characterized by the increase in frequency (number of cases) and duration (number of days) of the southern meridional circulation group.