Institute of Computational Mathematics and Mathematical Geophysics

Abstracts

Mathematical modeling of processes in atmosphere and hydrosphere

The long series of fluctuation of monthly and annual Northern Hemisphere atmospheric circulation from according to Dzerdzeevsky`s classification have been considered over the period from 1899 to 2002. The differences of character of atmospheric circulation between circulation epochs have been revealed. 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 peculiarity of the recent period - from 1981 to 2002 - consists a considerable increase of frequency (number of cases) and duration (number of days) of southern meridional group circulation, has been noted. It characterize by cyclone circulation on North Pole and simultaneous transference of south cyclone in three (in winter) - four (in summer) sectors of Hemisphere, that results in instability of atmospheric circulation. In Pacific, Far East and European sectors its increase is most observed. This tendency is necessary considerate in model of atmospheric processes.

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