古地理学报 ›› 2023, Vol. 25 ›› Issue (1): 245-254. doi: 10.7605/gdlxb.2023.01.016

• 第四纪古地理学及沉积学 • 上一篇    

贵州黔西县水西洞石笋记录的末次冰期Heinrich Stadial 4气候突变事件*

冯唐慧1, 张鑫1,2, 何尧启3, 杨云月1, 邱万银1, 姜修洋1,2   

  1. 1 福建师范大学地理科学学院湿润亚热带生态—地理过程教育部重点实验室,福建福州 350007;
    2 福建师范大学地理研究所,福建福州 350007;
    3 贵州民族大学旅游与航空服务学院,贵州贵阳 550025
  • 收稿日期:2022-06-12 修回日期:2022-09-19 出版日期:2023-02-01 发布日期:2023-02-17
  • 通讯作者: 姜修洋,男,1981年生,福建师范大学地理科学学院教授、博士生导师,主要从事岩溶过程与古气候重建。E-mail: xyjiang@fjnu.edu.cn。
  • 作者简介:冯唐慧,男,1997年生,福建师范大学硕士研究生,主要从事石笋古气候研究。E-mail: 1009553859@qq.com。
  • 基金资助:
    *国家自然科学基金项目(编号: 42071106)资助

Last glacial Heinrich Stadial 4 abrupt climatic events recorded by a stalagmite from Shuixi cave,Qianxi County,Guizhou Province

FENG Tanghui1, ZHANG Xin1,2, HE Yaoqi3, YANG Yunyue1, QIU Wanyin1, JIANG Xiuyang1,2   

  1. 1 Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, School of Geography Science, Fujian Normal University,Fuzhou 350007,China;
    2 Institute of Geography, Fujian Normal University,Fuzhou 350007,China;
    3 College of Tourism and Aviation Service, Guizhou Minzu University,Guiyang 550025,China
  • Received:2022-06-12 Revised:2022-09-19 Online:2023-02-01 Published:2023-02-17
  • Contact: JIANG Xiuyang,born in 1981,professor and doctoral supervisor in the School of Geography Science,Fujian Normal University,is mainly engaged in karst process and paleoclimate reconstruction. E-mail: xyjiang@fjnu.edu.cn.
  • About author:FENG Tanghui,born in 1997,master degree candidate of Fujian Normal University,is mainly engaged in stalagmite paleoclimatic research. E-mail: 1009553859@qq.com.
  • Supported by:
    Financially supported by the National Natural Science Foundation of China(No.42071106)

摘要: 末次冰期Heinrich Stadial 4气候突变事件(HS4事件)是发生于约40 ka B.P.(B.P. 表示Before Present,Present为公元1950年)最为显著的一次海因里希冰阶事件,对其转型特征和精细结构的刻画有助于深入理解千年尺度气候突变事件的机制。本研究基于贵州黔西县水西洞SXG-3石笋的11个高精度230Th年龄和277个 δ18O 数据,重建了40.77~37.17 ka B.P. 时段平均分辨率为13 a的亚洲夏季风强度演变序列。该石笋氧同位素记录清晰地捕捉到了HS4弱季风事件,呈现出三阶段变化的特征,即: 第1阶段(39.97~39.13 ka B.P.),石笋 δ18O 在840±90 a内偏正1.32‰,夏季风缓慢减弱,对应于热带辐合带(Intertropical Convergence Zone,简称ITCZ)的南移和格陵兰气候快速变冷; 第2阶段(39.13~38.35 ka B.P.),石笋 δ18O 整体偏正,平均为-8.34‰,夏季风强度达到最弱,而南美季风达到最强,对应于ITCZ移动至最南端; 第3阶段(38.35~37.59 ka B.P.),石笋 δ18O 在760±89 a的时间内偏负至-9.25‰,对应于ITCZ的向北移动和格陵兰气候快速变暖。水西洞石笋记录的HS4事件三阶段变化特征与福建仙云洞记录十分相似,对应于NEEM(Northern Greenland Eemian Ice Drilling)冰心17O-excess所反映的低纬水文循环过程变化,同时与南美Toca da Boa Vista(TBV)和Toca da Barrigude(TBR)洞穴石笋记录呈“镜像关系”。分析结果表明,在北半球高纬气候触发后,热带海洋和南半球热量的不断积聚及其随后的释放所引起的ITCZ的南北移动是造成这种三阶段变化的主要原因。

关键词: Heinrich Stadial 4, 石笋, 亚洲夏季风, 中国西南地区, 水西洞

Abstract: The last glacial Heinrich Stadial 4 event(HS4 event),which occurred at about 40 ka B.P.(“B.P.”is short for “Before Present,“Present”refers to 1950 AD),is the most significant Heinrich event. The characterization of its transition characteristics and detailed structure is helpful to further understand the mechanism of millennial-scale abrupt climate events in the last glacial period. We reconstructed the intensity evolution of Asian summer monsoon with average resolution of 13 a from 40.77 ka B.P. to 37.17 ka B.P. based on 11 230Th ages and 277 δ18O data derived from a stalagmite(SXG-3)at Shuixi Cave,Qianxi County,Guizhou Province. Our record captured the detailed structure of the HS4 event,showing three phages of change: In the first phase(from 39.97 to 39.13 ka B.P.),the stalagmite δ18O showed a positive excursion by 1.32‰ within 840±90 a,indicating that the summer monsoon weakened slowly,associated with the southward shift of the Intertropical Convergence Zone(ITCZ)and the rapid cooling in Greenland area;in the second phase(from 39.13 to 38.35 ka B.P.),the stalagmite δ18O was generally positive,with an average of -8.34‰. During this phase,the summer monsoon intensity reached the weakest point,while the South American monsoon reached the strongest point,corresponding to the ITCZ lingered at its southernmost position;in the third phase(from 38.35 to 37.59 ka B.P.),the stalagmite δ18O was gradually negative to -9.25‰ at 760±89 a,corresponding to the northward movement of the ITCZ and the rapid warming of Greenland area. The three-phase structure of the HS4 event recorded in Shuixi Cave is similar to that recorded in Xianyun Cave,Fujian Province,and corresponds to the changes in low-latitude hydrological cycle processes reflected by the NEEM(Northern Greenland Eemian Ice Drilling)Ice core 17O-excess. It also represents a “mirror image”of the stalagmite records of the Toca da Boa Vista(TBV)and Toca da Barrigude(TBR)caves in South America. The analysis results show that upon triggering the high latitude climate in the northern hemisphere,the north-south movement of the ITCZ caused by the continuous accumulation and subsequent release of heat in the tropical ocean and the southern hemisphere is the main cause of such three-stage change.

Key words: Heinrich Stadial 4, stalagmite, Asian Summer Monsoon, Southwest China, Shuixi cave

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