A 3000-year climatic record from biogenic silica oxygen isotopes in an equatorial high-altitude lake
A record of oxygen isotopes in biogenic opal, 4200 to 1200 calibrated years before the present, from a high-altitude proglacial lake on Mount Kenya, East Africa, exhibits short-term fluctuations on a time scale of centuries as well as long-term variations. The short-term fluctuations are attributed to changes in the glacier meltwater input, and the long-term variations are related to changes in lake temperature. The record indicates that the climate was warm in Equatorial East Africa from 2300 to 1500 years before the present.
M. Rietti-Shati and A. Shemesh, Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel. W. Karlen, Department of Physical Geography, University of Stockholm, Stockholm S-106 91, Sweden.
M
Rietti-Shati
A
Shemesh
W
Karlen