Integrated marine and terrestrial evidence for abrupt Congo River palaeodischarge fluctuations during the last deglaciation
Integrated marine and terrestrial evidence for abrupt Congo River palaeodischarge fluctuations during the last deglaciation
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DOI：
10.1002/jqs.646
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发表时间：
2001-12
影响因子：
2.3
通讯作者：
F. Marret;J. Scourse;G. Versteegh;J. H. Fred Jansen;R. Schneider
中科院分区：
文献类型：
--
作者：
F. Marret;J. Scourse;G. Versteegh;J. H. Fred Jansen;R. Schneider
基于来自刚果扇核的综合海洋和陆地代用品，我们提出了末次冰消过渡期（18至9 cal. kyr BP）热带古环境变化的高分辨率重建。花粉、草角质层、盘星藻和甲藻胞囊通量、沉积速率和浮游有孔虫δ 18 O比、u37 K '海面温度和烷烃/烯酮比数据凸显了刚果河古流量的一系列突变。一个主要的放电脉冲登记在约13.0卡尔。千年BP，我们归因于纬度迁移的热带辐合带（ITCZ）在冰川消退。这些数据表明，在岁差周期强迫的季风动力学系统内，赤道降水状况发生了突然和短暂的变化。增强的刚果排放阶段刺激了河流引起的上升流，并提高了邻近海洋的生产力。版权所有© 2001约翰威利父子有限公司。
We present a high‐resolution reconstruction of tropical palaeoenvironmental changes for the last deglacial transition (18 to 9 cal. kyr BP) based on integrated oceanic and terrestrial proxies from a Congo fan core. Pollen, grass cuticle, Pediastrum and dinoflagellate cyst fluxes, sedimentation rates and planktonic foraminiferal δ18O ratios, u37K′ sea‐surface temperature and alkane/alkenone ratio data highlight a series of abrupt changes in Congo River palaeodischarge. A major discharge pulse is registered at around 13.0 cal. kyr BP which we attribute to latitudinal migration of the Intertropical Convergence Zone (ITCZ) during deglaciation. The data indicate abrupt and short‐lived changes in the equatorial precipitation regime within a system of monsoonal dynamics forced by precessional cycles. The phases of enhanced Congo discharge stimulated river‐induced upwelling and enhanced productivity in the adjacent ocean. Copyright © 2001 John Wiley & Sons, Ltd.