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<title lang=en>20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments</title>
<creator>Revel, Marie</creator>
<creator>Ducassou, E.</creator>
<creator>Skonieczny, C.</creator>
<creator>Colin, C.</creator>
<creator>Bastian, L.</creator>
<creator>Bosch, Delphine</creator>
<creator>Migeon, S.</creator>
<creator>Mascle, J.</creator>
<contributor>Géoazur (GEOAZUR) ; Université Côte d'Azur (UCA) - Centre National de la Recherche Scientifique (CNRS) - Observatoire de la Côte d'Azur - Institut national des sciences de l'Univers (INSU - CNRS) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA)</contributor>
<contributor>UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) ; Observatoire aquitain des sciences de l'univers (OASU) ; Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Paris Sud (GEOPS) ; Université Paris-Sud - Paris 11 (UP11) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Dynamique de la Lithosphere ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Observatoire océanologique de Villefranche-sur-mer (OOVM) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0277-3791</source>
<source>Quaternary Science Reviews</source>
<publisher>Elsevier</publisher>
<identifier>hal-01277950</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01277950</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01277950</source>
<source>Quaternary Science Reviews, Elsevier, 2015, 130, pp.200-221. 〈10.1016/j.quascirev.2015.10.030〉</source>
<identifier>DOI : 10.1016/j.quascirev.2015.10.030</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2015.10.030</relation>
<language>en</language>
<subject lang=en>Western Nile upper continental slope sediments</subject>
<subject lang=en>East African monsoon</subject>
<subject lang=en>Nile river</subject>
<subject lang=en>Palaeohydrology</subject>
<subject lang=en>Neodymium and oxygen isotopes</subject>
<subject lang=en>Major elements</subject>
<subject lang=en>Holocene</subject>
<subject lang=en>Last deglaciation</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Multi-proxy analysis of two marine sediment cores (MS27PT and MD04-2726) from the Nile continental slope provides evidence of changes in Nile sediment discharge related to changes in Ethiopian African Monsoon (EAM) precipitation, and allows us to reconstruct changes in Nile River runoff, vegetation and erosion in the Nile headwaters. Sediment element composition and neodymium isotopic composition reveal significant changes in clastic sediment provenance, with sources oscillating between a Saharan aeolian contribution during the Last Glacial Maximum/deglacial transition and during the Late Holocene, and a Blue/Atbara Nile fluvial contribution during the African Humid Period (AHP). This study provides a new understanding of past environmental changes. Between 14.6 and 14.13 ka there was a major input of sediments from the Ethiopian Highlands, consistent with a stronger EAM at that time. Climate in the Nile basin was wetter between 14.8 and 8.4 ka, with a corresponding increase in Blue Nile water and sediment discharge via the main Nile into the Eastern Mediterranean. The gradual climatic transition from the AHP to the present-day dry climate was reflected in a decrease in Blue Nile sediment deposition and flood discharge between 8.4 and 3.7 ka, with aridity at a maximum between 3.7 and 2.6 ka. The onset of drier conditions in the Blue Nile basin seems to have begun before the 8.2 ka cooling event in the North Atlantic. We speculate that the climatic change from the wet AHP to the dry late Holocene may have been a result of a break in the low latitude dynamic equilibrium between climate, vegetation and erosion, which may in turn have affected the climate in higher latitudes. Reduced Nile flow may also have had an impact on Levantine Intermediate Water originating in the Eastern Mediterranean through an increase in intermediate water formation.</description>
<date>2015-12-15</date>
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