Tracking atmospheric and riverine terrigenous ...
Document type :
Article dans une revue scientifique: Article original
DOI :
Title :
Tracking atmospheric and riverine terrigenous supplies variability during the last glacial and the Holocene in central Mediterranean
Author(s) :
Bout Roumazeilles, Viviane [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Combourieu-Nebout, N. [Auteur]
Paléocéanographie [PALEOCEAN]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Histoire naturelle de l'Homme préhistorique [HNHP]
Desprat, S. [Auteur]
Environnements et Paléoenvironnements OCéaniques [EPOC]
Siani, G. [Auteur]
Géosciences Paris Sud [GEOPS]
Turon, J.-L. [Auteur]
Environnements et Paléoenvironnements OCéaniques [EPOC]
Essallami, L. [Auteur]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]

Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Combourieu-Nebout, N. [Auteur]
Paléocéanographie [PALEOCEAN]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Histoire naturelle de l'Homme préhistorique [HNHP]
Desprat, S. [Auteur]
Environnements et Paléoenvironnements OCéaniques [EPOC]
Siani, G. [Auteur]
Géosciences Paris Sud [GEOPS]
Turon, J.-L. [Auteur]
Environnements et Paléoenvironnements OCéaniques [EPOC]
Essallami, L. [Auteur]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Journal title :
Climate of the Past
Pages :
1065-1087
Publisher :
European Geosciences Union (EGU) [2005-....]
Publication date :
2013
ISSN :
1814-9324
HAL domain(s) :
Planète et Univers [physics]/Sciences de la Terre/Climatologie
English abstract : [en]
A multiproxy study coupling mineralogical, grain size and geochemical approaches was used to tentatively retrace eolian and fluvial contributions to sedimentation in the Sicilian Tunisian Strait since the last glacial. The ...
Show more >A multiproxy study coupling mineralogical, grain size and geochemical approaches was used to tentatively retrace eolian and fluvial contributions to sedimentation in the Sicilian Tunisian Strait since the last glacial. The eolian supply is dominant over the whole interval, excepted during the sapropel Si when riverine contribution apparently became significant. Saharan contribution increased during the B011ing Allerod, evidencing the persistence of aridity over North Africa although the northern Mediterranean already experienced moister and warmer conditions. The Younger Dryas is marked by proximal dust inputs, highlighting intense regional eolian activity. A southward migration of dust provenance toward Sahel occurred at the onset of the Holocene, likely resulting from a southward position of the Inter Tropical Convergence Zone that was probably associated with a large-scale atmospheric reorganization. Finally, a peculiar high terrigenous flux associated with drastic modifications of the mineralogical and geochemical sediment signature occurred during the sapropel 51, suggesting the propagation of fine particles derived from major floodings of the Nile River resulting from enhanced rainfall on northeastern Africa and their transportation across the Sicilian Tunisian Strait by intermediate water masses.Show less >
Show more >A multiproxy study coupling mineralogical, grain size and geochemical approaches was used to tentatively retrace eolian and fluvial contributions to sedimentation in the Sicilian Tunisian Strait since the last glacial. The eolian supply is dominant over the whole interval, excepted during the sapropel Si when riverine contribution apparently became significant. Saharan contribution increased during the B011ing Allerod, evidencing the persistence of aridity over North Africa although the northern Mediterranean already experienced moister and warmer conditions. The Younger Dryas is marked by proximal dust inputs, highlighting intense regional eolian activity. A southward migration of dust provenance toward Sahel occurred at the onset of the Holocene, likely resulting from a southward position of the Inter Tropical Convergence Zone that was probably associated with a large-scale atmospheric reorganization. Finally, a peculiar high terrigenous flux associated with drastic modifications of the mineralogical and geochemical sediment signature occurred during the sapropel 51, suggesting the propagation of fine particles derived from major floodings of the Nile River resulting from enhanced rainfall on northeastern Africa and their transportation across the Sicilian Tunisian Strait by intermediate water masses.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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