156°W 
172°E 
A 
Ca_ _-*__ 
440 60W40PI 
90W 10PI 
ICE FREE 
76°s 
74°s 
72°s 
SOW10PI 362 
70°s 
68°S 
KEY TO ICE SYMBOLS 
[COVERAGE (CONCENTRATION) | (ace) THICKNESS AND SNOW COVER 
0, — 
66S oS a on = 
Ice free % dominant, % i Thickness: | where ie be a inches 
fe} <0 (open water) Si=Slush  W=Winter ice) ‘Snow cover: ncDo 
eS VNTR TID pment creed 
RSSSS3] 0.1 thru 0.4 (scattered ica) athey VAM 
ASSN Examples: »arete.  C=ice uniformly snow covered 
Gow, «Pt W 
(Mes thru 0.7 (broken ice) ees cover in drifts 
WATER FEATURES ee IO Roscoe ptese 
KX \08 thru 03 (close ca) Pa 
- —— TOPOGRAPHY. 
__. Puddles: dominant amount 
FEB] 10 consolidated or ts ee) fanienthalaniess AA Ratted ice 
frozen or rotten NM Ridged ice 
= = 
iL COVERAGE BY SIZE F=Froren  R=Rotten aap 
64's Cn Pd Pd Pd 
Euamples: 5: 
n,=tenths of slush, brash, and block — ayyee Crack S——= Lead 
ny=tenths of small and medium floes 
ny=tenths of giant floes and field 
© Polynya 
ICE_OF LAND. ORIGIN 
BOUNDARY 
—— Observed 
— Estimated 
= © © Limit of observed data 
172°W 
A Icedergs—many (>20) 
A\ Icebergs—tew (<20) 
@ Bergy bits and growlers (>20) 
© Bergy bits and growlers (<20) 
Extent: H=very extensive 
L=few present 
‘When no entry appears beneath 
symbol extent is moderate 
Examples: 
AA very extensive ridging 
AA =moderate rafting 
200 =few hummocks 
180° 
164°E 156°E 
18-23 DECEMBER 1960 
172°E 
FIGURE 69. RESULTS OF SURFACE ICE RECONNAISSANCE, ROSS SEA 
99 
