8 Recent Change—Sea Ice 
149 
Fig. 8.4 Probability distributions 
of maximum sea ice extent in the 
Baltic Sea during 1911-2011, 
1981-2011 and 1991-2011 
(a) 
0.4 
Distribution of ice extent in the 
Baltic Sea (100a) 
(b) 
0.4 
Distribution of ice extent in the 
Baltic Sea (30a) 
0 50 100 150 200 250 300 350 400 450 0 50 100 150 200 250 300 350 400 450 
Ice extent (10 3 km 2 ) 
Ice extent (10 3 km 2 ) 
(c) 
0.4 
Distribution of ice extent in the 
Baltic Sea (20a) 
0 50 100 150 200 250 300 350 400 450 
Ice extent (10 3 km 2 ) 
Fig. 8.5 Probability of sea ice 
occurrence in the southern Baltic 
(a) 
Sea (Schmelzer et al. 2012) 
56* N 
55* N 
54° N 
Frequency of ice occurrence in the 30-year period 1961 -1990 
10* E 11° E 12° E 13* E 14* E 15° E 16° E 17° E 18° E 19° E 
10° E 
N 
N 
N 
Frequency of ice occurrence in the 30-year period 1981 - 2010 
(b) 10° E 11* E 12* E 13* E 14° E 15* E 16“ E 17* E 18° E 19* E