Coupled thermal and hydrological evolution of tropical Africa over the last deglaciation |
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Authors: | Weijers Johan W H Schefuss Enno Schouten Stefan Sinninghe Damsté Jaap S |
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Affiliation: | Royal Netherlands Institute for Sea Research, Department of Marine Biogeochemistry and Toxicology, Post Office Box 59, 1790 AB Den Burg-Texel, Netherlands. jweijers@nioz.nl |
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Abstract: | We analyzed the distribution of branched tetraether membrane lipids derived from soil bacteria in a marine sediment record that was recovered close to the Congo River outflow, and the results enabled us to reconstruct large-scale continental temperature changes in tropical Africa that span the past 25,000 years. Tropical African temperatures gradually increased from approximately 21 degrees to 25 degrees C over the last deglaciation, which is a larger warming than estimated for the tropical Atlantic Ocean. A direct comparison with sea-surface temperature estimates from the same core revealed that the land-sea temperature difference was, through the thermal pressure gradient, an important control on central African precipitation patterns. |
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