20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments
| dc.rights.license | open | en_US |
| hal.structure.identifier | Géoazur [GEOAZUR 7329] | |
| dc.contributor.author | REVEL, Marie | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | DUCASSOU, Emmanuelle | |
| dc.contributor.author | SKONIECZNY, C. | |
| hal.structure.identifier | Géosciences Paris Sud [GEOPS] | |
| dc.contributor.author | COLIN, C. | |
| hal.structure.identifier | Géoazur [GEOAZUR 7329] | |
| dc.contributor.author | BASTIAN, L. | |
| hal.structure.identifier | Géosciences Montpellier | |
| dc.contributor.author | BOSCH, Delphine | |
| hal.structure.identifier | Géoazur [GEOAZUR 7329] | |
| dc.contributor.author | MIGEON, S. | |
| hal.structure.identifier | Observatoire océanologique de Villefranche-sur-mer [OOVM] | |
| dc.contributor.author | MASCLE, J. | |
| dc.date.accessioned | 2024-06-04T14:22:43Z | |
| dc.date.available | 2024-06-04T14:22:43Z | |
| dc.date.issued | 2015-12-15 | |
| dc.identifier.issn | 0277-3791 | en_US |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/200260 | |
| dc.description.abstractEn | 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. | |
| dc.language.iso | EN | en_US |
| dc.subject.en | Western Nile upper continental slope sediments | |
| dc.subject.en | East African monsoon | |
| dc.subject.en | Nile river | |
| dc.subject.en | Palaeohydrology | |
| dc.subject.en | Neodymium and oxygen isotopes | |
| dc.subject.en | Major elements | |
| dc.subject.en | Holocene | |
| dc.subject.en | Last deglaciation | |
| dc.title.en | 20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments | |
| dc.type | Article de revue | en_US |
| dc.identifier.doi | 10.1016/j.quascirev.2015.10.030 | en_US |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Géochimie | en_US |
| bordeaux.journal | Quaternary Science Reviews | en_US |
| bordeaux.page | 200-221 | en_US |
| bordeaux.volume | 130 | en_US |
| bordeaux.hal.laboratories | EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805 | en_US |
| bordeaux.institution | Université de Bordeaux | en_US |
| bordeaux.institution | CNRS | en_US |
| bordeaux.team | GEOLSED | en_US |
| bordeaux.peerReviewed | oui | en_US |
| bordeaux.inpress | non | en_US |
| bordeaux.import.source | hal | |
| hal.identifier | hal-01277950 | |
| hal.version | 1 | |
| hal.popular | non | en_US |
| hal.audience | Internationale | en_US |
| hal.export | false | |
| workflow.import.source | hal | |
| dc.rights.cc | Pas de Licence CC | en_US |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Quaternary%20Science%20Reviews&rft.date=2015-12-15&rft.volume=130&rft.spage=200-221&rft.epage=200-221&rft.eissn=0277-3791&rft.issn=0277-3791&rft.au=REVEL,%20Marie&DUCASSOU,%20Emmanuelle&SKONIECZNY,%20C.&COLIN,%20C.&BASTIAN,%20L.&rft.genre=article |
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