East African paleoenvironments are highly variable, marked by extreme fluctuations in moisture availability, which has far-reaching implications for the origin, evolution and dispersal of Homo sapiens in and beyond the region. This paper presents results from a pilot core from the Chew Bahir basin in southern Ethiopia that records the climatic history of the past 45 ka, with emphasis on the African Humid Period (AHP, ∼15–5 ka calBP). Geochemical, physical and biological indicators show that Chew Bahir responded to climatic fluctuations on millennial to centennial timescales, and to the precessional cycle, since the Last Glacial Maximum. Potassium content of the sediment appears to be a reliable proxy for aridity, showing that Chew Bahir reacted to the insolation-controlled humidity increase of the AHP with a remarkably abrupt onset and a gradual termination, framing a sharply defined arid phase (∼12.8–11.6 ka calBP) corresponding to the Younger Dryas chronozone. The Chew Bahir record correlates well with low- and high-latitude paleoclimate records, demonstrating that the site responded to regional and global climate changes.
http://www.sciencedirect.com/science/article/pii/S104061821200448X Accessed 195 times | Last updated 29.01.2015
Foerster, V., Junginger, A., Langkamp, O., Schäbitz, F., Gebru, T., Asrat, A., Umer, M., Lamb, H., Wennrich, V., Rethemeyer, J., Nowaczyk, N., Trauth, M. (2013): Climate change recorded in the sediments of Chew Bahir, southern Ethiopia, during the last 45,000 years.
|Authors||Foerster, Verena and Junginger, Annett and Langkamp, Oliver and Schäbitz, Frank and Gebru, Tsige and Asrat, Asfawossen and Umer, Mohammed and Lamb, Henry F. and Wennrich, Volker and Rethemeyer, Janet and Nowaczyk, Norbert and Trauth, Martin H.|
|Title||Climate change recorded in the sediments of Chew Bahir, southern Ethiopia, during the last 45,000 years|