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苏门答腊海区末次间冰期以来的季风上升流活动记录
  • 摘要

    对苏门答腊海域BAR9432岩芯末次间冰期以来的氧碳同位素、AMS14C测年、浮游有孔虫组合及其所反映的古生产力、温盐及温跃层变化的研究结果表明:研究区132kaB.P.以来气候变化的特点,明显受冰期间冰期海平面波动的影响,在此基础上,还与23ka岁差周期引起的北半球高纬太阳辐射变化密切相关.末次间冰期阶段,海平面较高与全新世接近,陆源营养物质输入量减少,研究站位古生产力低,混合层厚,无上升流活动,看不到印度西南夏季风的影响;末次冰期阶段,海平面下降,陆源物质输入量增加,古生产力较高.在此基础上,北半球夏季日照率高值阶段,古生产力更高,说明当时西南季风活动强烈,西南季风流输送赤道印度洋高盐度水至苏门答腊沿岸,使研究区盐度升高,8月盐度远高于2月,盐度季节差大;较微弱的印度季风流与赤道逆流,在澳大利亚东南季风的影响下,可以在研究区形成相对显著的上升流活动,混合层薄,古生产力高,澳大利亚东南季风强化了印度西南季风的影响;而北半球夏季日照率低时,印度西南季风较弱,上升流活动弱,古生产力低,其中氧同位素3期(MIS3)中期,印度东北季风增强,近岸地区蒸发强烈,2月盐度升高,盐度季节差减小.

  • 作者

    赵悦  丁旋  Zhao Yue  Ding Xuan 

  • 作者单位

    中国地质大学(北京)海洋学院,北京,100083

  • 刊期

    2011年2期 ISTIC PKU

  • 关键词

    晚更新世  浮游有孔虫  海平面变化  上升流  印度季风  苏门答腊海 

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