Palynological and oxygen isotope investigations on Late-Glacial sediment cores from Swiss lakes |
| |
| Authors: | ULRICH EICHER ULRICH SIEGENTHALER |
| |
| Institution: | Physikalisches Institut, Sidlerstr. 5, 3012 Bern, Switzerland |
| |
| Abstract: | Results from detailed pollen and 18O/16O studies on two sediment profiles from small Swiss lakes are reported. 18O/16O records in lacustrine carbonate contain paleoclimatic information because they reflect mainly the isotope ratio in rain and snow which is correlated to temperature. Several transitions between different climatic periods determined palyno-logically are also indicated by marked changes in the isotope ratios in both profiles, namely the transitions Oldest Dryas - Bøiling and Allerød - Younger Dryas - Preboreal. 18o/16O was 2 to 3 %0 lower during Younger Dryas than during the adjacent periods, corresponding to a temperature drop of a few degrees Centigrade according to a tentative estimate. |
| |
| Keywords: | |
|
|
