Journal of Tropical Oceanography ›› 2017, Vol. 36 ›› Issue (6): 19-26.doi: 10.11978/2016116CSTR: 32234.14.2016116

Special Issue: 海上丝绸之路专题

• 海洋地质学 • Previous Articles     Next Articles

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)

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

CLC Number: 

  • P736.2