KEY TO ICE SYMBOLS 
COVERAGE (CONCENTRATION) AGE 
Pons - 
5% dominant, % secondary 
FEE] <01 open wate Sl=Sush — W=Winter ce 
0.1 thru 0.4 (scattered ica) 
ESS 
[TTT] 05 thru 0.7 coroken ica) 
Y=sYoung ice PimPolar ice 
AA 
tow, cori Ww 
WATER” FEATURES 
AX 8 th 0.9 (close ice) Pd 
Puddles: dominant amount 
FESR 10 cconstdated or tat ie) Fan tenths les 
frozen or rotten 
COVERAGE BY SIZE F=Frazen R=Rotten 
tale Pd Pd Pd 
ie ty Ny Examples: Ea EGIR: 
fy =tenths of slush, brash, and block tase Crack S——= Lead 
‘fn, =tenths of small and medium floes oO Polynya 
ny=tenths of giant floes and field 
ICE OF LAND ORIGIN 
BOUNDARY A. Keebergs—many (>20) 
—— Observed J Icebergs—few (<20) 
——— Estimated @ Bergy bits and growlers (>20) 
© © © Limit of observed data a Bergy bits and growlers (<20) 
Examples: 
180° 172°E 
Cn A 
420 60SI40Y 
THICKNESS AND SNOW COVER 
Thickness: 1 here n= feet and inches 
sSSS 
Soom eet C]D/0 
n=depth to nearest inch 
C=ice uniformly snow covered 
D=snow cover in drifts 
O==no snow cover present 
AA Rafted ice 
NM Ridged ice 
OOO Hummocks 
Extent: H=very extensive 
L=few present 
When no entry appears beneath 
symbol extent is moderate 
Examples; 
cae very extensive ridging 
AA =moderate rafting 
ann =few hummocks 
164°E 
FIGURE 59. RESULTS OF AERIAL ICE RECONNAISSANCE, ROSS SEA 
89 
