越南岸外晚第四纪上升流与东亚夏季风变迁

被引:27
作者
黄宝琦
苑知湣
机构
[1] 同济大学海洋地质开放实验室!上海200092
关键词
上升流; 东亚夏季风; 晚第四纪; 越南岸外;
D O I
暂无
中图分类号
P736.22 [历史海洋学、海洋地层学];
学科分类号
070903 ;
摘要
通过对南海西部越南岸外17954—3柱状样中浮游和底栖有孔虫的定量分析,结合碳酸钙、有机碳和稳定同位素数据,获得南海西部上升流区近20万年来的古海洋学记录,进而讨论了晚第四纪东亚夏季风的变迁。结果表明,在间冰期,尤其是末次间冰期,越南岸外出现表层海水古温度低、温跃层浅、生产力高,同时底层海水富营养的现象,说明上升流的存在,且该上升流有从氧同位素5期(MIS5期)向1期逐渐减弱的趋势。结合南海现代海流及生产力分布的研究,推断该上升流由东亚夏季风驱动,其强弱的变化说明,东亚夏季风在近20万年来有间冰期增强、冰期减弱,且从MIS5期向MIS1期递减的特征。
引用
收藏
页码:518 / 525
页数:8
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