Ice Winter Severity Indicator for the Southern Baltic Sea

A new classification method was developed by Sztobryn (2005). It is based on the probability of ice occurrence and the number of days with sea ice observed in the analyzed period in the selected basins. The ice severity index is given by the relation 

Here 5 is the severity index, N is the number of days with ice observed during the winter season on the particular station (for the investigated purpose Zalew Szczecinski, 

FIGURE 8.15 Degree of difficulty for the winters 1950-2005 as a function of the air temperature. (See color plate) 

FIGURE 8.16 Comparison between ice severity index for the southern Baltic Sea and maximum extent of ice coverage in the Baltic Sea. 

Swinoujscie, Kolobrzeg, Gdynia, and Zalew Wislany), p is the probability of ice occurrence on the particular station, calculated for the analyzed period, j is the index of station and i stands for number of stations taken into account. 

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