26 
LAKE GERZENSEE DYE 3 GREENLAND 
98 1760 
188 1778 
150 1782 
220 1798 
258 1800 
300 1818 
358 1820 
400 cet 
“15  -18 -5-40 -3 
018 
(w) ydap 
depth (cm) 
4. Comparison of a section of the 6180 profile from the Dye 3 ice core (right) with the 
180 record in lake carbonate from Gerzensee (left). The strong similarities suggest that both 
records represent the same sequence of climatic events and thus the same time period. 
II. Other ice cores parameters during periods of drastic climatic change (Langway et al., 1984 
and Dansgaard et al., 1984) 
General picture: all measured parameters so far show significantly different values bet- 
ween cold and warm climatic system states: 
61809 difference: 4-5°/oo, COg concentration enriched by factor 1.4, Cl, S04, 
NO3 depleted in "warm" state by factors 1.6 to 4, 10Be by factor 1.5 to 2.5, also insoluble dust. 
Values in warm and cold system states are in relatively narrow bands compared to dif- 
ference between the bands. ieeguon of a bistable climate and environmental system. In 
European lake sediments (Lake Marl) 6! 80 signatures for the 14,000 to 9000 BP period can be 
found which are highly correlated to the 6180 signature in the Greenland ice cores (Figs. 3 and 
4). 
III. Elements of explanation of rapid Wisconsin climatic changes 
- 6180 changes (14,000 to 9000 BP) in Greenland ice and European lake sediments with high 
probability are linked to processes in the North Atlantic Ocean, as deduced from faunal and 
stratigraphic ocean sediment studies (Ruddiman and McIntyre, 1981), indicating advances and 
retreats of the deglacial polar water front. 
