SKONIECZNY, C.; MCGEE, D.; WINCKLER, G.; L.I., Bradtmiller; C.W., Kinsley; P.J., Polissar; DE POL-HOLZ, Ricardo; ROSSIGNOL, Linda; MALAIZE, Bruno

doi:10.1126/sciadv.aav1887

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SKONIECZNY, C.
Géosciences Paris Sud [GEOPS]
Department of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge] [EAPS]

MCGEE, D.
Massachusetts Institute of Technology [MIT]

WINCKLER, G.
Lamont-Doherty Earth Observatory [LDEO]
Department of Earth and Environmental Sciences, Columbia University

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Science Advances. 2019, vol. 5, n° 1, p. eaav1887

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Reconstructions of past Saharan dust deposition in marine sediments provide foundational records of North African climate over time scales of 10(3) to 10(6) years. Previous dust records show primarily glacial-interglacial variability in the Pleistocene, in contrast to other monsoon records showing strong precessional variability. Here, we present the first Saharan dust record spanning multiple glacial cycles obtained using Th-230 normalization, an improved method of calculating fluxes. Contrary to previous data, our record from the West African margin demonstrates high correlation with summer insolation and limited glacial-interglacial changes, indicating coherent variability in the African monsoon belt throughout the late Pleistocene. Our results demonstrate that low-latitude Saharan dust emissions do not vary synchronously with high-and mid-latitude dust emissions, and they call into question the use of existing Plio-Pleistocene dust records to investigate links between climate and hominid evolution.< Réduire

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Monsoon-driven Saharan dust variability over the past 240,000 years

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