Chemistry and stable isotope record of sediment core GeoB4905-4 ...

• Main Authors: Adegbie, Adesina T, Schneider, Ralph R, Röhl, Ursula, Wefer, Gerold
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2003
• Subjects: Gravity corer Kiel type; M41/1; Meteor 1986; Geosciences, University of Bremen GeoB; South Atlantic in Late Quaternary Reconstruction of Budget and Currents SFB261; Greenland; Greenland ice cores; ice core
• Online Access: https://dx.doi.org/10.1594/pangaea.736662; https://doi.pangaea.de/10.1594/PANGAEA.736662

Evidence of rapid climatic oscillations like those observed in the Greenland ice cores and sediments from high latitudes of the northern Atlantic have been recognized in the pulses of terrigenous material to continental margin sediments off Cameroon. Fe/Ca ratios used as a parameter to quantify the relative proportions of terrigenous fluxes versus marine carbonate monitor the variability of the west African monsoon. They reveal the history of abrupt changes in precipitation over western and central Africa during the past 52 kyr. These rapid changes are particularly pronounced during the last glacial period and occur at timescales of a few thousand years. Stable oxygen isotope (delta18O) records of Globigerinoides ruber (pink) show high negative values reflecting periods of high monsoon precipitation. The Fe/Ca pattern is very similar to the Dansgaard-Oeschger cycles from the Greenland ice cores. The good correspondence between the warm interstadials of the Dansgaard-Oeschger cycles from the GISP2 ice core ... : Supplement to: Adegbie, Adesina T; Schneider, Ralph R; Röhl, Ursula; Wefer, Gerold (2003): Glacial millennial-scale fluctuations in central African precipitation recorded in terrigenous sediment supply and freshwater signals offshore Cameroon. Palaeogeography, Palaeoclimatology, Palaeoecology, 197(3-4), 323-333 ...