Universität zu Köln

Guinoiseau, D., Singh, S. P., Galer, S. J. G., Abouchami, W., Bhattacharyya, R., Kandler, K., Bristow, C. and Andreae, M. O. (2022). Characterization of Saharan and Sahelian dust sources based on geochemical and radiogenic isotope signatures. Quat. Sci. Rev., 293. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1873-457X

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Abstract

Mineral dust can significantly impact climate and biogeochemical cycles on Earth. To understand dust provenance, an accurate characterization of dust sources and emission regions is required. In this study, we combine rare-earth element patterns, elemental ratios, and radiogenic Sr-Nd-Pb isotopes to discriminate dust sources from key regions in North Africa responsible for similar to 55% of the total dust load emitted annually on Earth. This new dataset, based on fifty-nine analyses of deflatable fine soil material, improves our current knowledge about North African dust sources, especially those underrepresented in Saharan-Sahelian regions. Six potential source areas (PSA) - Libya-Algeria-Mali (PSA(LAM)), Libya-Egypt (PSA(LE)), Bodele Depression (PSA(BD)), Mali Center (PSA(MC)), West African Coast (PSA(WAC)) and Mauritania (PSA(Ma)) - are defined based on several lithogenic tracers as well as on the geological subdivision of North African geological provinces, providing a unique chemical and isotope fingerprint for each PSA. For example, the PSA(BD) - the main dust activation area in North Africa - is clearly distinguished from western African sources using Pb isotopes. Major elements show a large variability within each PSA and are not alone diagnostically useful. Comparison of the newly defined PSA with aerosols collected in remote locations over the North Atlantic shows that their sources are predominantly from western African regions (PSA(LAM) and PSA(WAC)). Bodele-derived dust has a limited impact on the bulk dust transported over the tropical North Atlantic, regardless of the season and altitude of dust transport. The low impact of the Bodele Depression can be explained by a high deposition rate (wet and dry) of aerosols along its southwestward trajectory. A detailed analysis of dust collected over South America during winter will be essential to confirm this observation at a global scale. The present dataset can be efficiently used to track modern dust emissions as well as their changes at the scale of glacial/interglacial cycles or during the development of African Humid Periods as stored in sedimentary archives. (C) 2022 The Authors. Published by Elsevier Ltd.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Guinoiseau, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Singh, S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Galer, S. J. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Abouchami, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bhattacharyya, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kandler, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bristow, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Andreae, M. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-691979
DOI:	10.1016/j.quascirev.2022.107729
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	293
Date:	2022
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1873-457X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RARE-EARTH-ELEMENTS; TROPICAL ATLANTIC-OCEAN; AFRICAN MINERAL DUST; ND-HF ISOTOPES; BODELE DEPRESSION; WESTERN AFRICA; LEAD ISOTOPES; TERRIGENOUS INPUT; SOURCE SEDIMENTS; NORTH-AFRICA Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69197