Monsoon-driven Saharan dust variability over the past 240,000 years
| Type | Article | ||||||||||||
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| Date | 2019-01 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Skonieczny C.1, 2, McGee D.2, Winckler G.3, 4, Bory A.3, 5, Bradtmiller L. I.6, Kinsley C. W.2, Polissar P. J.4, de Pol-Holz R.7, Rossignol L.8, Malaizé B.8 | ||||||||||||
| Affiliation(s) | 1 : Laboratoire Géosciences Paris-Sud, UMR CNRS 8148, Université de Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France. 2 : Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA. 3 : Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA. 4 : Department of Earth and Environmental Sciences, Columbia University, New York, NY, USA. 5 : Université de Lille, CNRS, Université Littoral Cote d’Opale, UMR 8187, LOG, Laboratoire d’Océanologie et de Géosciences, Lille, France. 6 : Department of Environmental Studies, Macalester College, St. Paul, MN, USA. 7 : GAIA-Antártica, Universidad de Magallanes, Punta Arenas, Chile. 8 : Laboratoire Environnements et Paléoenvironnements Océaniques et Continentaux, UMR CNRS 5805, Université de Bordeaux, Pessac, France. |
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| Source | Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2019-01 , Vol. 5 , N. 1 , P. eaav1887 (9p.) | ||||||||||||
| DOI | 10.1126/sciadv.aav1887 | ||||||||||||
| WOS© Times Cited | 82 | ||||||||||||
| Abstract | Reconstructions of past Saharan dust deposition in marine sediments provide foundational records of North African climate over time scales of 103 to 106 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 230Th 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. |
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