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| 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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| Capron, Emilie; Govin, Aline; Stone, Emma J.; Masson-delmotte, Valerie; Mulitza, Stefan; Otto-bliesner, Bette; Rasmussen, Tine L.; Sime, Louise C.; Waelbroeck, Claire; Wolff, Eric W.. |
| The Last Interglacial (LIG, 129-116 thousand of years BP, ka) represents a test bed for climate model feedbacks in warmer-than-present high latitude regions. However, mainly because aligning different palaeoclimatic archives and from different parts of the world is not trivial, a spatio-temporal picture of LIG temperature changes is difficult to obtain. Here, we have selected 47 polar ice core and sub-polar marine sediment records and developed a strategy to align them onto the recent AICC2012 ice core chronology. We provide the first compilation of high-latitude temperature changes across the LIG associated with a coherent temporal framework built between ice core and marine sediment records. Our new data synthesis highlights non-synchronous maximum... |
| Tipo: Text |
Palavras-chave: Last Interglacial period; Marine sediment cores; Ice cores; Data synthesis; Climate model simulations. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40063/39166.pdf |
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