贵州黔西县水西洞石笋记录的...adial_4气候突变事件_冯唐慧.pdf

书书书第 25 卷第 1 期2023 年2 月古地理学报JOUNAL OF PALAEOGEOGAPHY(Chinese Edition)Vol.25No.1Feb 2023文章编号:16711505(2023)01024510DOI:107605/gdlxb202301016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1，21 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 3500072 福建师范大学地理研究所，福建福州 3500073 贵州民族大学旅游与航空服务学院，贵州贵阳 550025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 BeforePresent，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 SXG3 石笋的 11 个高精度230Th 年龄和 277个 18O 数据，重建了 40.7737.17 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(39.9739.13 ka B.P)，石笋 18O 在 84090 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(39.1338.35 ka B.P)，石笋 18O 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 18O 在 76089 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 Drill-ing)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(TB)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第一作者简介冯唐慧，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:。通讯作者简介姜修洋，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:。中图分类号:P532文献标志码:A*国家自然科学基金项目(编号:42071106)资助。Financially supported by the National Natural Science Foundation of China(No.42071106)收稿日期:20220612改回日期:20220919Last glacial Heinrich Stadial 4 abrupt climatic events recorded bya stalagmite from Shuixi cave，Qianxi County，Guizhou ProvinceFENG Tanghui1ZHANG Xin1，2HE Yaoqi3YANG Yunyue1QIU Wanyin1JIANG Xiuyang1，21 Key Laboratory of Humid Sub-tropical Ecogeographical Process of Ministry of Education，School of Geography Science，Fujian Normal University，Fuzhou 350007，China2 Institute of Geography，Fujian Normal University，Fuzhou 350007，China3 College of Tourism and Aviation Service，Guizhou Minzu University，Guiyang 550025，China古地理学报2023 年 2 月AbstractThe last glacial Heinrich Stadial 4 event(HS4 event)，which occurred at about40 ka B.P(“B.P”is short for“Before Present，“Present”refers to 1950 AD)，is the most signifi-cant Heinrich event The characterization of its transition characteristics and detailed structure is helpful tofurther understand the mechanism of millennial-scale abrupt climate events in the last glacial period Wereconstructed the intensity evolution of Asian summer monsoon with average resolution of 13 a from40.77 ka B.P to 37.17 ka B.P based on 11230Th ages and 277 18O data derived from a stalagmite(SXG3)at Shuixi Cave，Qianxi County，Guizhou Province Our record captured the detailed structureof the HS4 event，showing three phages of change:In the first phase(from 39.97 to 39.13 ka B.P)，the stalagmite 18O showed a positive excursion by 1.32 within 84090 a，indicating that the summermonsoon 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 18O was generally positive，with an average of 8.34 During this phase，the summermonsoon intensity reached the weakest point，while the South American monsoon reached the strongestpoint，corresponding to the ITCZ lingered at its southernmost position;in the third phase(from 38.35 to37.59 ka B.P)，the stalagmite 18O was gradually negative to 9.25 at 76089 a，corresponding tothe northward movement of the ITCZ and the rapid warming of Greenland area The three-phase structure ofthe HS4 event recorded in Shuixi Cave is similar to that recorded in Xianyun Cave，Fujian Province，andcorresponds to the changes in low-latitude hydrological cycle processes reflected by the NEEM(NorthernGreenland Eemian Ice Drilling)Ice core17O-excess It also represents a“mirror image”of the stalagmiterecords of the Toca da Boa Vista(TBV)and Toca da Barrigude(TB)caves in South America Theanalysis 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 thetropical ocean and the southern hemisphere is the main cause of such three-stage change.Key wordsHeinrich Stadial 4，stalagmite，Asian Summer Monsoon，Southwest China，Shuixi caveAbout the first authorFENG Tanghui，born in 1997，master degree candidate of Fujian NormalUniversity，is mainly engaged in stalagmite paleoclimatic research E-mail:About the corresponding authorJIANG Xiuyang，born in 1981，professor and doctoral supervi-sor in the School of Geography Science，Fujian Normal University，is mainly engaged in karst process andpaleoclimate reconstruction E-mail:1概述末次冰期频现大规模、快速的千年尺度气候突变事件。这些事件首次在格陵兰冰心的氧同位素记录中被发现(Grootes et al，1993;Johnsen et al，2001)，其特征是初始突然变暖，随后逐渐变冷，被称为 Dansgaard-Oeschger(DO)旋回，包括格陵兰冰阶(Greenland Stadials，简称 GS)和间冰阶(Greenland Interstadials，简称 GIS)。此外，在北大西洋深海沉积物中也发现了 6 次典型的冰漂碎屑(Ice afted Debris，简称 ID)事件，称为海因里希事件(Heinrich Events，简称 HEs)(Heinrich，1988;Hemming，2004)。研究