156°W 
COVERAGE (CONCENTRATION) 
KEY 10 ICE SYMBOLS 
AGE 
THICKNESS AND SNOW COVER} 
172°w 180° 
Ro thru 0.4 (scattered ice) 
(i 05 thru 0.7 (broken ice) 
KX 08 thru 09 (close ico) 
eeseee| 1.0 (consolidated or fast ice) 
Cn 
yy My 
fn, =tenths of slush, brash, and block 
fn,=Kenths of small and medium floes 
ny=tenths of giant floes and field 
—— Observed 
——-— Estimated 
© © © Limit of observed data 
A 
% dominant, % secondary 
Si=Slush  W=Winter xe 
Y=Young ice Pi=Polar ice 
Examples: te. 
Ave IND 
GOW, 40P1' W" 
WATER FEATURES 
= 
Puddles: dominant amount 
in tenths unless 
frozen or rotten 
F=Frozen R=Rotten 
Examples: Ra Pa Pd 
3 FR 
Wate Crack <= Lead 
© Polynya 
ICE OF LAND ORIGIN 
A Icebergs—many (>20) 
A\ Icebergs—few (<20) 
@ Bergy bits and growlers (>20) 
& Bergy bits and growlers (<20) 
Thickness: T here n=fest and inches 
Snow cover: =. \ 
ncdo 
n=depth to nearest inch 
C=ice uniformly snow covered 
D=snow cover in drifts 
O=no snow cover present 
[TOPOGRAPHY | 
AA Rafted ice 
NWA Ridged ice 
OOO Hummocks 
Extent: H=very extensive 
L=few present 
When no entry appears beneath 
symbol extent is moderate 
Examples: 
AA very extensive ridging 
AA =moderate rafting 
000 =alew hummocks: 
180° 
172°E 
164°E 156°E 
74S 
72°s 
CRACKS 
[4 OCTOBER 1960 
172°E 164°E 
FIGURE 55. RESULTS OF AERIAL ICE RECONNAISSANCE, ROSS SEA 
85 
