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Weldeab, Syee; Schneider, Ralph R; Kölling, Martin; Wefer, Gerold (2005): Mg/Ca ratios of Globigerinoides ruber of sediment core GeoB4905-4. PANGAEA,, Supplement to: Weldeab, S et al. (2005): Holocene African droughts relate to eastern equatorial Atlantic cooling. Geology, 33(12), 981-984,

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Here we present evidence that the Holocene African monsoon system (AMS) varied in response to the eastern equatorial Atlantic sea-surface temperature (SST). Several short-term episodes of decreased moisture availability as a result of low eastern equatorial Atlantic SST are suggested by planktonic foraminiferal Mg/Ca ratios. These episodes promoted a weakening of the AMS and thus determined the timing and intensity of arid periods. Local sea-surface salinities also reveal regional patterns of precipitation in equatorial western Africa. The high eastern equatorial Atlantic SSTs occur in concert with seasonally increased insolation at low latitudes, suggesting a strong response of African monsoonal precipitation to oceanic conditions at low latitudes.
Latitude: 2.500000 * Longitude: 9.390000
Date/Time Start: 1998-03-01T06:48:00 * Date/Time End: 1998-03-01T06:48:00
GeoB4905-4 * Latitude: 2.500000 * Longitude: 9.390000 * Date/Time: 1998-03-01T06:48:00 * Elevation: -1328.0 m * Recovery: 12.18 m * Location: off Cameroon * Campaign: M41/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: CC: dark olive hemipelagic mud
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