24 
CO, concentration 
250 
= 
a 
Qa 
~— 
N 
oO 
oO 
200 
13860 1870 1880 1890 
180/160 ratio 
880 (°/o0) 
1860 1870 1880 1890 
Depth (m) 
Fig. 2. COg and 6180 values measured on ice samples from Dye 3: a) Circles indicate the 
results of single measurements of the CO2 concentration of air extracted from ice samples. The 
solid line connects the mean values for each depth; b) The solid line connects the 0180 measure- 
ments done on 0.1 m core increments. 
Rapid climatic variations in the Wisconsin (Fig. 2) 
In the period 30,000 to 40,000 BP (approx.) rapid climatic variations reflected in 6180 are in 
phase with COg variations: cold periods with 180-200 ppm, warm periods with 250-270 ppm. 
(Artifact due to COg enriched melt-layers, exchange with carbonates in ice matrix, etc. cannot 
completely be excluded; final proof should be obtained from analysis of Antarctic ice cores with 
different chemical properties and accumulation temperatures.) 
