南海北部陆坡沉积记录的全新世早期夏季风极强事件

被引：18

作者：

杨文光

郑洪波

谢昕

周斌

成鑫荣

机构：

[1] 同济大学海洋地质国家重点实验室

来源：

第四纪研究 | 2008年 / 03期

关键词：

南海; 全新世; 夏季风极强事件; 太阳辐射; 热带辐合带;

D O I：

暂无

中图分类号：

P736.2 [海洋沉积、历史海洋学];

学科分类号：

070704 ; 0709 ;

摘要：

在AMS14C精确定年的基础上,通过南海北部MD05-2905站高分辨率的氧同位素、粒度、元素分析,其结果显示所有指标均在11.2～8.5kaB.P.期间发生异常,根据夏季风指标认为这是夏季风极强事件。将本站位相同纬度(20°N)的夏季平均日辐射量与季风指标进行对比,发现全新世早期(11.2～8.5kaB.P.)东亚夏季风极强事件对应着夏季太阳辐射量最大值和热带辐合带(ITCZ)的位置向北移动,说明全新世早期夏季风突然增强可能是在岁差周期控制下,较高的太阳辐射量驱动了热带辐合带(ITCZ)及其有关的雨场向北移动,在南海北部产生了大量的降水,导致氧同位素偏负、碳酸盐的含量较低以及线性沉积速率较高。这与前人对相邻地区湖光岩玛珥湖的孢粉研究、江西南岭地区泥炭的记录以及中国南方石笋记录的研究结果相吻合。该季风最强事件与阿拉伯海发现的早全新世季风最强事件以及根据格陵兰冰芯记录的早全新世甲烷最大值推测低纬地区湿地扩张相一致,这反映了南海北部全新世早期与全球低纬地区早全新世气候变化格局一致。

引用

页码：425 / 430

页数：6

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