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Niedermeyer, Eva M; Prange, Matthias; Mulitza, Stefan; Mollenhauer, Gesine; Schefuß, Enno; Schulz, Michael (2009): Alkenone data of sediment core GeoB9508-5 from the continental slope off Senegal. PANGAEA,, Supplement to: Niedermeyer, EM et al. (2009): Extratropical forcing of Sahel aridity during Heinrich stadials. Geophysical Research Letters, 36, L20707,

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In order to investigate a possible link between tropical Northeast (NE) Atlantic sea-surface temperature (SST), Atlantic meridional overturning circulation (AMOC), and drought in the Sahel during the past 44 thousand years (kyr) we used alkenone paleothermometry and d13C of C. wuellerstorfi of a marine sediment core from the continental slope off Senegal. Our data show periods of low SST and reduced AMOC that coincided with drought in the Sahel during North Atlantic Heinrich stadials (HS). The coldest period was HS1 (ca. 15-18 kyr before present, BP) when SST decreased by more than 2°C. Moreover, the SST off Senegal lagged variations in Sahel aridity, which is in agreement with results from a freshwater hosing experiment. We conclude that variations in tropical NE Atlantic SST were not the initial trigger of millennial-scale Sahel droughts of the past 44 kyr. Instead, it is thought that these droughts were induced by substantial coolings of the extratropical North Atlantic.
Related to:
Niedermeyer, Eva M (2009): Northwest African Sahel climate variations during Holocene/Late Pleistocene: Insights from plant wax stable hydrogen (dD) and carbon (d13C) isotopic composition and sea-surface temperature. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000116574
Latitude: 15.498333 * Longitude: -17.948000
Date/Time Start: 2005-06-15T13:51:00 * Date/Time End: 2005-06-15T13:51:00
Minimum DEPTH, sediment/rock: 0.12 m * Maximum DEPTH, sediment/rock: 6.92 m
GeoB9508-5 (293) * Latitude: 15.498333 * Longitude: -17.948000 * Date/Time: 2005-06-15T13:51:00 * Elevation: -2384.0 m * Recovery: 9.56 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology, 956 cm
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Heptatriaconta-8E,15E,22E-trien-2-oneC37:3Mearbitrary unitsNiedermeyer, Eva MCalculated, see reference(s)relative absorptions units
4Methlyheptatriaconta-15E,22E-dien-2-oneC37:2Mearbitrary unitsNiedermeyer, Eva MCalculated, see reference(s)relative absorptions units
5Alkenone, unsaturation index UK'37UK'37Niedermeyer, Eva MCalculated from C37 alkenones (Prahl & Wakeham, 1987)
6Sea surface temperature, annual meanSST (1-12)°CNiedermeyer, Eva MCalculated, see reference(s)
292 data points

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