60° 



160° 



170° 



180° 



170° 



I I I I I I I I I I I I I I I I I I I I I I I I • I i i i i i i i I i i i i 



60 





KEY TO ICE SYMBOLS 



ICOVSRACE (CONCENTI 



□ .,„„.,„ 



nnni« —"» 



■TIONli lACEl 



I THICKNESS AMD SNOW COVER) 



■&£-=nri utwart ridgini 



1) J 1 ^ 1 ^ "J2J M H| 





Puddle: Mn.i.1 unounl 







dST 



mrt.um Hoes O ^"l" 





AI«b«P-mMr(>»> 

 AlMb«(Il-1tw(<:a)) 



70° 



ROSS SEA 



'""'«««„ 



'"""""'to,*.*'"'"/! 



80° 



i i i i I I 



,ROSS ICE SHELF I 



I i i i j i i i j ' i i i I I 1 I — I — I — I — I — I — I — L 



160° 



170° 



180° 



170° 



FIGURE 21. ICE CONDITIONS, ROSS SEA AREA, USS ATKA, MARCH I960 



40 



