Coupled Thermal and Hydrological Evolution of Tropical Africa over the Last Deglaciation
Coupled Thermal and Hydrological Evolution of Tropical Africa over the Last Deglaciation
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DOI：
10.1126/science.1138131
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发表时间：
2007-03
期刊：
影响因子：
56.9
通讯作者：
J. Weijers;E. Schefuß;Stefan Schouten;J. Damsté
中科院分区：
文献类型：
--
作者：
J. Weijers;E. Schefuß;Stefan Schouten;J. Damsté
我们分析了来自土壤细菌的分支四醚膜脂质在海洋沉积物记录中的分布，这些记录是在靠近刚果河流出处恢复的，结果使我们能够重建过去25，000年来热带非洲大规模的大陆温度变化。在最后一次冰川消退期间，热带非洲的气温从21摄氏度逐渐上升到25摄氏度，这比热带大西洋的估计升温幅度更大。通过与同一岩心的海表温度估计值进行直接比较，发现海陆温差通过热压梯度对中非降水模式起着重要的控制作用。
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 ∼21° to 25°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.