Baltic Sea Ice Climate Workshop 2005 
64 
Gulf of Gdansk - sea ice conditions in 15 cen. 
' certain 
v.probably 
probably 
CO 
CO 
''t 
co 
"3- 
Fig. 3. Reconstruction of sea ice conditions in Gulf of Gdansk in 15 century 
The dark bars indicate severe, very severe winters and also very mild, which could be 
determined as certain. The grey bars present the winters' severity classified as very probable. 
On contrary the winters, for which probability of determination of the severity rate was lower 
(however it oscillated between 1 and 2) are presented with dotted bars. 51 winters were 
classified as certain: 14 were the very mild, 20 severe and very severe and 17 as others (mild 
and moderate). Only 7 winters were classified with high probability as mild and moderate Sea- 
ice cover appeared on Gulf on Gdansk in first, and third decade. The highest number of severe 
and very severe winters occurred in fifties and from middle sixties till seventies of the 15 
century. The second decade was without severe winters. The number of very mild winters were 
higher in the first half of investigated century. 
Final comments 
The study is a fragment of the publication just in the course of preparing, referring to sea ice 
conditions of the Gulf of Gdansk and severity of winters within a period of 14 up to 18 century. 
The paper shall contain, among the others, extracts from historical sources and summary of 
their contents in a table form as well as the results concerning studies on severity of winters. 
References 
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zjawiskach hydrologiczno- meteorologicznych na ziemiach polskich w wiekach od X do 
XVI, Warszawa,, Wydawnictwa Komunikacji i L^cznosci 
Betin B., J.Preobrazenskij, 1962. Surowostc zim w Ewropie i ledowost Baltiki, Leningrad, 
Koslowski G., Loewe P., 1994.The Western Baltic Sea Ice Season in Terms of a Mass-Related 
Severity Index 1879-1992, Tellus 46A,66-74,