65N 



65W 



60W 



55W 



SOW 



65N 



60N 



55N 



SON 



3/10 or greater sea 

 ice concentration 



(Redrawn from Joint 

 Ice Center, 1989) 



1 972—82 mean 

 sea ice edge 



(Redrawn from Naval 

 Oceanography Command, 1986) 



60W 



S5W 



Figure 18. 



Page 30 



