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Astronomically forced variations in western African rainfall (21 N-20 S) during the Last Interglacial period ArchiMer
Govin, Aline; Varma, Vidya; Prange, Matthias.
This study documents the long-term evolution of western African precipitation during the Last Interglacial (LIG). We compare geochemical records obtained on nine sediment cores from the western African margin to a transient simulation (130–115 ka) performed with an ocean-atmosphere general circulation model and insolation as sole forcing. Good agreement between proxy records and model outputs indicates that long-term changes in western African precipitation largely responded to insolation variations during most of the LIG. After an early LIG dry phase (related to high-latitude iceberg melting or dating uncertainties), boreal summer insolation controlled the intensification of the North African monsoon between 127 and 122 ka, perhaps facilitating human...
Tipo: Text Palavras-chave: Last Interglacial; Africa; Precipitation; Astronomical forcing; Marine sediment cores; Model simulations.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00290/40164/38778.pdf
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