Timing and stepwise transitions of the African Humid Period from geochemical proxies in the Nile deep-sea fan sediments
PIVOT, Sébastien
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
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Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
PIVOT, Sébastien
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
DAVTIAN, Nina
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
< Reduce
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
Language
EN
Article de revue
This item was published in
Quaternary Science Reviews. 2020-01, vol. 228, p. 106071
English Abstract
Large fluvial systems, such as the Nile River, allow a basin-scale integrated view of climatological and environmental changes. In this study, we reconstructed the Nile discharge history for the last 20 ka using molecular ...Read more >
Large fluvial systems, such as the Nile River, allow a basin-scale integrated view of climatological and environmental changes. In this study, we reconstructed the Nile discharge history for the last 20 ka using molecular ratios of glycerol dialkyl glycerol tetraethers (GDGTs) and neodymium (Nd) radiogenic isotopes. By characterizing both the organic and inorganic fractions, we assessed the relevance of the GDGT-based proxies in deltaic environments as tracers of terrigenous origin. A large increase in Nile discharge is documented from 14.8 to 8.4 ka BP reflecting enhanced physical erosion and transport processes from the Ethiopian Traps. We confirmed the primary control of insolation on precipitation on North East Africa through the last 20 ka. The centennial time resolution reached on the sedimentary sequence revealed a step-wise onset and termination of the African Humid Period (AHP) starting at 14.8 ka and ending at 8.4 ka BP, respectively. Our centennial-millennial records allowed furthermore pinpointing the abrupt periods of arid conditions corresponding to the Younger Dryas. These data illustrate the linkage between low and high latitude hydrological variability.Read less <
English Keywords
Nile river
GDGT-indices
African Humid Period
Clastic εNd