Preliminary evidence of environmental changes at Lake Bambili (Cameroon, West Africa) since 24,000 BP

Preliminary evidence of environmental changes at Lake Bambili (Cameroon, West Africa) since... Preliminary analyses of diatoms, phytoliths, and siliceous protozoan plate records in a 16 m sediment core from Lake Bambili (Cameroon, West Africa; 2264 m AMSL) provide evidence of pronounced climatic changes in the West Cameroon Highlands since ~24,000 14 C yrs BP. Percentages of planktonic diatoms rose with increased precipitation:evaporation ratios around 24,000 BP, ~15,000-9500 BP, and ~2400-2000 BP. Since 15,000 BP, Bambili appears to have experienced climatic changes of comparable timing and magnitude, but with signs in opposition to those registered in the West African lowlands. Much of this pattern may be attributable to variability in montane stratiform cloud formation, which in turn is related to paleo-wind regimes and upwelling dynamics in the Gulf of Guinea. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Paleolimnology Springer Journals

Preliminary evidence of environmental changes at Lake Bambili (Cameroon, West Africa) since 24,000 BP

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Publisher
Springer Journals
Copyright
Copyright © 1999 by Kluwer Academic Publishers
Subject
Earth Sciences; Paleontology; Sedimentology; Climate Change; Physical Geography; Freshwater & Marine Ecology; Geology
ISSN
0921-2728
eISSN
1573-0417
D.O.I.
10.1023/A:1008098211671
Publisher site
See Article on Publisher Site

Abstract

Preliminary analyses of diatoms, phytoliths, and siliceous protozoan plate records in a 16 m sediment core from Lake Bambili (Cameroon, West Africa; 2264 m AMSL) provide evidence of pronounced climatic changes in the West Cameroon Highlands since ~24,000 14 C yrs BP. Percentages of planktonic diatoms rose with increased precipitation:evaporation ratios around 24,000 BP, ~15,000-9500 BP, and ~2400-2000 BP. Since 15,000 BP, Bambili appears to have experienced climatic changes of comparable timing and magnitude, but with signs in opposition to those registered in the West African lowlands. Much of this pattern may be attributable to variability in montane stratiform cloud formation, which in turn is related to paleo-wind regimes and upwelling dynamics in the Gulf of Guinea.

Journal

Journal of PaleolimnologySpringer Journals

Published: Oct 14, 2004

References

  • Diatom-based transfer functions for inferring past hydrochemical characteristics of African Lakes
    Gasse, F.; Juggins, S.; Ben Khelifa, L.

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