热带海洋学报 ›› 2022, Vol. 41 ›› Issue (1): 82-93.doi: 10.11978/2021011

• 海洋气象学 • 上一篇    下一篇

4个代表站点的珊瑚δ18O数据对热带印度洋气候变率的反演能力分析*

陈云帆1,2,3(), 陈天然1, 龙上敏4, 陈泽生1,2,3, 杜岩1,2,3()   

  1. 1. 热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东 广州 510301
    2. 中国科学院大学海洋学院, 北京 100049
    3. 南方海洋科学与工程广东省实验室(广州), 广东 广州 511458
    4. 河海大学海洋学院, 江苏 南京 210098
  • 收稿日期:2021-01-25 修回日期:2021-04-28 出版日期:2022-01-10 发布日期:2021-05-12
  • 通讯作者: 杜岩
  • 作者简介:陈云帆(1998—), 女, 江苏省南京市人, 硕士研究生, 主要从事热带海洋气候变率研究。email: chenyunfan20@mails. ucas.ac.cn
  • 基金资助:
    国家自然科学基金(41830538);国家自然科学基金(42090042);中国科学院国际合作局对外合作重点项目(133244KYSB20190031);国际空间水循环观测星座计划(183311KYSB20200015);国际空间水循环观测星座计划(2019BT02H594)

Reconstruction of climate variability of the tropical Indian Ocean based on coral δ18O data from four representative sites

CHEN Yunfan1,2,3(), CHEN Tianran1, LONG Shangmin4, CHEN Zesheng1,2,3, DU Yan1,2,3()   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
    4. College of Oceanography, Hohai University, Nanjing 210098, China
  • Received:2021-01-25 Revised:2021-04-28 Online:2022-01-10 Published:2021-05-12
  • Contact: DU Yan
  • Supported by:
    National Natural Science Foundation of China(41830538);National Natural Science Foundation of China(42090042);CAS-CSIRO Project(133244KYSB20190031);Global Water Cycle Observatory(183311KYSB20200015);Southern Laboratory of Ocean Science and Engineering(2019BT02H594);Southern Laboratory of Ocean Science and Engineering(GML2019ZD0303)

摘要:

珊瑚中的δ18O含量可以高精度地记录热带海洋中的气候变率及气候变化信息, 从而弥补器测观测时间长度有限的缺陷, 为反演过去长期的气候状况提供了可能。热带印度洋的气候模态通过海气相互作用影响周边区域甚至全球的气候, 具有重要的研究意义。本文对比分析了1880—1999年间热带印度洋4个站点(肯尼亚、坦桑尼亚、塞舌尔、明打威)的珊瑚δ18O数据, 研究了其对热带印度洋气候的反演情况。结果显示, 珊瑚δ18O对海表温度(sea surface temperature, SST)的长期变化趋势反演良好, 珊瑚δ18O与局地SST在季节循环中保持一致, 且在低温季节对SST的变化更为敏感。此外, 4个站点的珊瑚δ18O对印度洋海盆模态(Indian Ocean Basin Mode, IOBM)和印度洋偶极子模态(Indian Ocean Dipple Mode, IODM)有一定的表征能力, 并且δ18O记录的热带印度洋年际变率受年代际变率调制。本文的研究结果表明, 珊瑚δ18O数据对于了解古气候时期热带印度洋气候变率具有重要的指示意义, 但同时也需要综合考虑不同站点的信息来完整地反映印度洋在历史时期的气候变化情况。

关键词: 热带印度洋, 珊瑚δ18O, 印度洋气候模态, IOBM, IODM

Abstract:

The coral δ18O data can precisely record climate variation and change of the tropical ocean, making up the shortage of deficient instrumental observations and providing us with the possibility of retrieving long-term paleoclimate conditions. The climate modes of the tropical Indian Ocean influence the climate of the surrounding region and even the globe through ocean-atmosphere interaction; so they are of great significance in climate study. In the present study, coral δ18O data from 1880 to 1999 at four sites located in the tropical Indian Ocean (Kenya, Seychelles, Tanzania, Mentawai) are used to study their ability to reproduce past climate in the tropical Indian Ocean. First, coral δ18O and SST changes are consistent on the long-term trend. Second, coral δ18O coincides nicely with local SST in terms of seasonal cycle, and is more sensitive to SST variation in cold seasons. What is more, coral δ18O at the four sites can describe changes of IOBM (Indian Ocean Basin Mode) and IODM (Indian Ocean Dipole Mode), but the interannual variability of the tropical Indian Ocean recorded by coral δ18O is modulated by interdecadal variation. This study suggests that the δ18O data from coral is an essential indicator of paleoclimate in the tropical Indian Ocean. Different sites' information should be taken into account to reflect past climate change in the Indian Ocean.

Key words: tropical Indian Ocean, coral δ18O, Indian Ocean climate mode, Indian Ocean Basin Mode, Indian Ocean Dipole Mode

中图分类号: 

  • P732.5