重庆金佛洞石笋δ13C记录的Heinrich6期间气候环境变化  

Climatic and environmental changes during Heinrich 6 recorded byδ13C in stalagmites from Jinfo Cave,Chongqing

作　　者：组里塞斯 杨勋林[1,2,3] 王勇 胡明广[1] 许奕滨 Zulisaisi;YANG Xunlin;WANG Yong;HU Mingguang;XU Yibin(School of Geographical Sciences,Southwest University/National Observation and Research Station of Karst Ecosystem in Jinfo Mountain of Chongqing,Chongqing 400715,China;Chongqing Key Laboratory of Karst Environment,Chongqing 400715,China;Nanchuan Field Scientific Observation&Research Base of Karst Eco-environment,Ministry of Natural Resources of the People’s Republic of China,Chongqing 400715,China)

机构地区：[1]西南大学地理科学学院/重庆金佛山喀斯特生态系统国家野外科学观测研究站,重庆400715 [2]重庆岩溶环境开放实验室,重庆400715 [3]自然资源部岩溶生态环境——重庆南川野外基地,重庆400715

出　　处：《中国岩溶》2023年第3期590-602,共13页Carsologica Sinica

基　　金：国家自然科学基金项目(41971109,41572158);国家重点研发计划项目(2016YFC0502301)。

摘　　要：在末次冰期发生的6次海因里希事件(Heinrich事件,简称H事件)中,H6事件发生年代最早,对其研究较少,利用高分辨率石笋记录研究H6事件期间的气候环境变化,有助于理解高低纬度气候变化对H事件的响应过程。本文基于重庆市金佛洞石笋JF2017铀系测年数据和碳同位素数据,重建H6事件期间中国西南地区季风气候环境的演化过程。结果显示:石笋JF2017的δ13C值在61811±204 a B.P.~59716±159 a B.P.时段显著偏重,持续大约2095 a,暗示该时段季风减弱和生态植被退化,对应北大西洋H6事件。H6事件期间,石笋JF2017的δ13C记录在61811~60848 a B.P.期间开始先逐渐偏重至最大值,随后发生短时间尺度的波动变化;最后在60848~59716 a B.P.期间缓慢偏轻至H6事件结束,整体呈现先逐渐偏重后又缓慢偏轻的趋势,内部存在百年际尺度的气候震荡,表明H6事件期间当地气候不稳定。石笋JF2017记录的百年际尺度的季风气候变化可能与热带辐合带和北大西洋经向翻转环流密切相关。Of the six Heinrich events(H event for short)occurring during the last glacial period,H6 event has been less studied due to its earliest occurrence time.However,using high-resolution stalagmite records to study climate and environmental changes during H6 event can help people understand the response of climate change at high and low latitudes to the H events.In recent years,much progress has been made in terms of studies on paleoclimate and environmental changes with use of stalagmiteδ13C records.Besides,some stalagmiteδ13C records have been used to study the climate change of the events on a millennium scale during the last glacial period,but there is no detailed record of the high-resolution climate change in Southwest China during the H6 event.In this case,the JF2017 stalagmiteδ13C may provide an excellent proxy for exploring the climate and environmental change during H6 event.Based on the dating data of uranium series and carbon isotope data of JF2017 stalagmite in Jinfo Cave,we analyzed the climate significance indicated by stalagmiteδ13C,and reconstructed the evolution process of the monsoon climate environment in Southwest China during H6 event. Developed from the Jinfo-Yangzi Cave system, Jinfo Cave is located in Jinfo Mountain, Nanchuan district,Chongqing, Southwest China, with an altitude of 2,080 m. The Jinfo Mountain area belongs to subtropical humidmonsoon climate, which is jointly affected by the Indian Summer Monsoon and the East Asian Summer Monsoon(ASM). In this study, the age samples of stalagmites were tested by Neptune Plus Multi-receiver Plasma InductivelyCoupled Mass Spectrometry (MC-ICP-MS), and the carbon isotopes of stalagmites were tested by Delta-V-Plus gasisotope ratio mass spectrometer and carbonate automatic sampling device Kiel-IV online. The experimental results arebased on Vienna Pee Dee Belemnite (V-PDB) with δ13C experimental analysis error<0.06 ‰(2σ). According to dataanalysis, the variation range of stalagmite JF2017 δ13C is from -1.44 ‰ to -4.92 ‰, with an avera

关 键 词：亚洲季风 Heinrich 6 石笋δ13C 金佛洞 中国西南 

分 类 号：P532[天文地球—古生物学与地层学]