Mathematics – Logic
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3620707n&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 20, CiteID L20707
Mathematics
Logic
1
Global Change: Abrupt/Rapid Climate Change (4901, 8408), Geographic Location: Africa, Paleoceanography: Sea Surface Temperature, Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041), Atmospheric Processes: Paleoclimatology (0473, 4900)
Scientific paper
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 δ 13C 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.
Mollenhauer Gesine
Mulitza Stefan
Niedermeyer Eva M.
Prange Matthias
Schefuß Enno
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