Ice in the Sea 



271 



20° 40° 60° 80° 



80° 80° 



70° 



65° 



75° 75° 



70° 70° 



65° 65' 



Fig. 125. Mean position of the ice limit from April to August in the Barents Sea for the 

 period 1898-1922 (25-year mean, normal period) and for the period 1929-38 (10-year mean, 



warm period). 



4. Land Ice in the Sea 



(a) Glaciation in Polar Areas 



In the polar regions the climatic snow-line Ues so low that under the prevailing 

 orographic conditions the glacial endings of the ice streams reach the sea and spread 

 into the ocean. The coverage of polar regions by glaciers was given by Hess and is 

 shown in Table 104. 



Table 104. Glaciation in the polar regions 



Area in 1000 kjn^ 



In the Northern Hemisphere the overwhelming part of the total glaciation is on 

 Greenland where only 0-325 million km^ of its total area of 2-16 million km^ is ice- 

 free. Glaciers flow out from all sides from the inland ice and a large number of them 



