热带海洋学报 ›› 2017, Vol. 36 ›› Issue (6): 19-26.doi: 10.11978/2016116

所属专题: 海上丝绸之路专题

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安达曼海沉积物粒度记录的全新世印度洋夏季风演化

黄云1,2(), 向荣1(), 刘升发3, 杨艺萍1,2, 刘建国1   

  1. 1. 中国科学院边缘海与大洋地质重点实验室(南海海洋研究所), 广东 广州 510301
    2. 中国科学院大学, 北京 100049
    3. 国家海洋局第一海洋研究所, 山东 青岛 266061;
  • 收稿日期:2016-11-16 修回日期:2017-01-02 出版日期:2017-11-30 发布日期:2018-01-18
  • 作者简介:

    作者简介:黄云(1990#cod#x02014;), 男, 湖北省潜江市人, 硕士研究生, 海洋环境沉积。Email: huangyun@mail.iggcas.ac.cn

  • 基金资助:
    中国科学院战略性先导科技专项(XDA11030104);国家自然科学基金项目(91228207、41476040)

Indian Summer Monsoon evolution in the Andaman Sea during the Holocene: Evidence from grain size records

Yun HUANG1,2, Rong XIANG1, Shengfa LIU3, Yiping YANG1,2, Jianguo LIU1   

  1. 1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
  • Received:2016-11-16 Revised:2017-01-02 Online:2017-11-30 Published:2018-01-18
  • About author:

    Author:QIU Chunhua.E-mail: qiuchh3@mail. sysu.edu.cn

  • Supported by:
    Strategic Leading Science #cod#x00026; Technology Programme, Chinese Academy of Sciences (XDA11030104);National Natural Science Foundation of China (91228207, 41476040)

摘要:

对位于安达曼海区的柱状样ADM-C1进行了沉积物粒度分析, 根据标准偏差变化对粒度组分进行了划分。发现2个主要敏感粒级组分1.5~11.9#cod#x003bc;m、11.9~74#cod#x003bc;m有明显的波动变化, 研究认为它们主要受控于与印度洋夏季风密切相关的海域环流动力变化。通过敏感粒级组分相关指标变化重建了安达曼海区全新世以来印度洋夏季风演化历史, 结果表明全新世印度洋夏季风变化总体可以分为3个演化阶段: 1) 10.4~8.8ka BP, 印度洋夏季风强度为3个阶段最弱时期; 2) 8.8~4.7ka BP, 敏感粒级组分占全样的百分含量和平均粒径均明显增加, 表明印度洋夏季风强度处于全新世最强盛时期; 3) 4.7~0ka BP, 敏感粒级组分占全样的百分含量和平均粒径明显降低, 指示了该时期印度洋夏季风的强度较前一阶段明显减弱。粒度重建的印度洋夏季风变化与其他重建结果在全新世有较好的一致性, 表明敏感粒级组分在安达曼海可以作为研究印度洋夏季风变化的可靠替代指标。

关键词: 安达曼海, 印度洋夏季风, 敏感粒级组分, 百分含量, 平均粒径

Abstract:

Based on the sediment grain size analysis of the gravity core ADM-C1 from the Andaman Sea, grain size populations were partitioned using the method of grain size versus standard deviation. It was found that two sensitive grain size populations (1.5~11.9 #cod#x003bc;m and 11.9~74 #cod#x003bc;m) had significant fluctuations, and were mainly controlled by the circulation dynamics in the sea area, which was closely related to the Indian Summer Monsoon (ISM). Evolution history of the ISM in the Andaman Sea during the Holocene is reconstructed based on sensitive grain size populations. The results show that the evolution history of the ISM generally can be divided into three stages: 10.4~8.8 ka BP, when the intensity of the ISM was the weakest of the three stages; 8.8~4.7 ka BP, when percentage and average grain size of the sensitive grain size populations had significant increase, indicating that the intensity of the ISM was at its strongest stage during this period; and 4.7~0 ka BP, when sharp decreases of percentage and average grain size of the sensitive grain size populations indicated that the intensity of the ISM was obviously weaker than those of the previous two stages. The reconstructed evolution history of the ISM shown in this paper is consistent with many other records during the Holocene, and further verifies the feasibility that sensitive grain size can be used as a reliable proxy of the ISM in the Andaman Sea.

Key words: Andaman Sea, Indian Summer Monsoon, sensitive grain size group, percentage, average grain size

中图分类号: 

  • P736.2