156°W 164°W 1722W 180° 172°E 164°E 
McMURDO 
SOUND 
[COVERAGE (CONCENTRATION) ) 
(THICKNESS “AND SNOW COVER) 
SN 
[Jie tree == Thicker: | where ma feet and inches 
<0.) (open weter) SimSech Wee Winter ica 
YouYoung ico PlmPoiar ica 
0. tors 0.4 (scattered ica) 
(DDT 95 toe 07 (oration ica) 
BX at te (cae end 
FESR 0 (conte ott en) 
BCs 
or) 
s=tenties of seth, brash, and BOCK awe Crock Mace Led 
s,=stenths of small and medium floes Orr 
‘my=tenths of giant floes and held 
A Icaberps--many (>20) 
D herberps—few (<20) 
— Estimated & Berg bits and growiers (>20) 
© © © Limit of observed data. Bargy bits and growlers (<20) 
Soom cover: = 
nmdepth to nasrest inch, 
Cosica uniformly snow covered 
Daxsnow cover in érifts 
Oma snow cover present 
AA Rated ice 
AM Ried ica 
0010 Hammocks 
Extent: H=very extensive 
Ltew present 
When no entry appears beoeath 
symbol extent is moderate 
Examples: 
AO every extensive riding 
AA =moderste rafting 
13-14 FEBRUARY I96I 
= | 
156°W 164°W 172°W 180° 172°E 164°E 
78s 
[COVERAGE (CONCENTRATION) } 
[THICKNESS AND SNOW COVER) 
(TDD) o: tore 07 corona) 
E058 thes 09 (one ies) 
PER 0 ccomatite ott in) 
= 
eth 
snyetenths of steah, brash, and Bloc sagge Crach Mme Lesd 
,=tenths of small and medium floes Onin 
‘njsstentns of giant floes and Feit 
TCE_OF LAND ORIGIN 
‘BOUNDARY, A. \caberps—many (>20) 
— Observed LS lexbergs—tew (<2) 
——— Estimated @& Bergy bits and growlers (>20) 
= © © Limit of observed data 2. Bergy bits and growiers (<720) 
FIGURE 74. RESULTS OF SURFACE ICE RECONNAISSANCE, ROSS SEA 
Ja tre ———*____Thickners: | where n= feet 204 inches 
amdepth to nearest inch 
Cmmica uniformly snow covered 
Deesnow cover in drifts 
‘Omno snow cover present 
Extent: H=very extensive 
Lfew present 
When 10 entry appears beneath 
symbol extent ix moderate 
Cuamples: 
20 very extensive riding 
AA =mederate rifting 
000 ten hammocks 
104 
156°E 
156°E 
78°s 
76°s 
74°s 
72°s 
