ABSTRACT
The values of basic Sreg statistics, when compared, allowed to distinguish three groups of regions considered here, which were similar to each other with regard to the sea ice conditions.
The first group, the “mild winters zone”, consisted of the Western Baltic Sea, Southern Baltic Sea and the Aland Sea; the second group, the “normal winters zone” made the western Gulf of Finland and the Sea of Bothnia. Into the third group, the “severe winters zone”, were included the Norra Kvarken and the Bay of Bothnia, where the statistical parameters of Sreg were positively higher, than in the remaining considered regions of the Baltic Sea. It must be stressed that
though very characteristic, the above cited indices did not involve all areas of the Baltic Sea, as for instance, the south-eastern coasts of the central sea parts.
