DOI: 10.1016/j.quascirev.2015.10.030
Scopus记录号: 2-s2.0-84949024125
论文题名: 20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments
作者: Revel M. ; Ducassou E. ; Skonieczny C. ; Colin C. ; Bastian L. ; Bosch D. ; Migeon S. ; Mascle J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 130 起始页码: 200
结束页码: 221
语种: 英语
英文关键词: East African monsoon
; Holocene
; Last deglaciation
; Major elements
; Neodymium and oxygen isotopes
; Nile river
; Palaeohydrology
; Western Nile upper continental slope sediments
Scopus关键词: Atmospheric thermodynamics
; Catchments
; Climate change
; Erosion
; Hierarchical systems
; Isotopes
; Neodymium
; Rivers
; Submarine geology
; Vegetation
; Continental slope
; East africans
; Holocenes
; Last deglaciation
; Major elements
; Nile rivers
; Oxygen isotopes
; Palaeohydrology
; Sediments
; catchment
; climate variation
; eolian deposit
; headwater
; Holocene
; intermediate water
; isotopic composition
; monsoon
; paleohydrology
; river flow
; river system
; sediment core
; Ethiopian Highlands
; Nile River
英文摘要: 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. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59754
Appears in Collections: 过去全球变化的重建
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作者单位: Geoazur, 250 Rue Albert Einstein, Valbonne-Sophia Antipolis, France; Université de Bordeaux 1, UMR-CNRS 5805-EPOC, allée Geoffroy St Hilaire, Pessac Cedex, France; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Unité de Recherche Géosciences, Marines, Plouzané, France; IDES Laboratoire IDES UMR 8148 CNRS-Université, de Paris-Sud XI Bât 504, Orsay Cedex, France; Géosciences Montpellier, Université de Montpellier II, Montpellier, France; Observatoire Océanologique de Villefranche, chemin du Lazaret, Villefranche sur Mer, France
Recommended Citation:
Revel M.,Ducassou E.,Skonieczny C.,et al. 20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments[J]. Quaternary Science Reviews,2015-01-01,130