156°W 
76°s 
74°s 
72°s 
70°s 
68°S 
(COVERAGE (CONCENTRATION) 
°, 
s6S Ice free 
<0.1 (open water) 
§ 1 thru 04 (scattered ica) 
(ies thru 0.7 (broken ica) 
18 thr 0.3 (cise co) 
FEE 1.0 (consolidated oF fast ice) 
COVERAGE BY SIZE 
64°s Cn 
my 
‘ny =tenths of slush, brash, and block 
8, =IHenths of small and medium floes 
Ay==tenths of giant floes and field 
164°W 
KEY TO ICE SYMBOLS 
A 
Fe dominant, % secondary 
S=Slush W=Winter ica 
YerYoung ice Pl=Polar ico 
Examples: = 
WATER FEATURES 
aol ee: 
Puddles: dominant amount 
in tenths unless 
frozen of rotten 
FeeFrozen R=Rotten 
Pd Pd Pd 
Examples TER 
A te. 
Wore Crack S— Lead 
© Palynya 
ICE OF LAND ORIGIN 
BOUNDARY 
Observed 
Estimated 
* © © Limit of observed data 
172°w 
A Icebergs —many (>20) 
QD leebdergs—few (<20) 
@& Bergy bits and growlers (>20) 
© Bergy bits and growlers (<20) 
THICKNESS AND SNOW COVER 
Srey 
n=depth to nearest inch 
Ceice uniformly snow covered 
D={now cover in drifts 
O=no snow cover present 
AA Ratted ice 
NW Ridged ce 
ONO Hummocks 
Extent: H=very extensive 
L=few present 
When no entry appears beneath 
symbol extent 1s moderate 
Examples 
en very extensive ridging 
AA =moderate rafting 
000 tem hummocks 
180° 
172°E 
ood 
= 
= 
Sg LESS THAN ONE TENTH 
156 °E 
25-27 JANUARY I96I 
172°E 
FIGURE 72. RESULTS OF SURFACE ICE RECONNAISSANCE, ROSS SEA 
102 
