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

DOI

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.

Identifier
DOI https://doi.org/10.1594/PANGAEA.733699
Related Identifier https://doi.org/10.1029/2009GL039687
Related Identifier https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000116574
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.733699
Provenance
Creator Niedermeyer, Eva M; Prange, Matthias; Mulitza, Stefan; Mollenhauer, Gesine; Schefuß, Enno; Schulz, Michael
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2009
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 292 data points
Discipline Earth System Research
Spatial Coverage (-17.948 LON, 15.498 LAT)