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ka
B.P. L.L.J,..LJ.. ........ u
34
Fig. 3. 6(180 ) profiles along the Dye
3 (0 to 1982 m depth) and the Camp
Century (0 to 1370 m depth) ice cores
plotted on a common linear time scale
as described in /17/.
10,000 yrs) values, but the Dye 3 core is hardly continuous beyond 93,000
yrs before present.
In both records, the mid and late parts of the last glaciation are characteri
zed by 1 arge amp 1 i tude osci 11 ati ons in 6 18 0. In the Camp Century record
they are detectable even back into the Eemian, yet of smaller amplitude.
Under full glacial conditions, the 6'S at Dye 3 have a tendency to
alternate between two levels of approximately -32 and -35.5 %D, at Camp
Century between approximately -37.5 and -42 %0.
Other ice core parameters, such as the chemical composition /18/, the dust
concentration (/19/, cf. Fig. 4), and perhaps the atmospheric CO 2 concentration
in the air bubbles /5/, vary in phase or antiphase with the
6 curve, which indicates that radical and abrupt changes of the environment
took place many times during the glaciation.
For example, the anti-correlation between 6 and the content of dust (airborne,
insoluble microparticles, mostly loess) suggests that the cold
phases of the climatic oscillations were characterized by much higher.
stormi ness, and dryer cond; ti ons in the source areas of loess south of
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