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 Wang Luyao,Zhao Kan,Huang Wei,et al.Centennial-Scale Monsoon Failure During the Younger Dryas Event Record in a High-ResolutionStalagmite from Longfugong Cave,Central China[J].Journal of Nanjing Normal University(Natural Science Edition),2017,40(01):134.[doi:10.3969/j.issn.1001-4616.2017.01.020]





Centennial-Scale Monsoon Failure During the Younger Dryas Event Record in a High-ResolutionStalagmite from Longfugong Cave,Central China
王璐瑶12赵 侃12黄 伟12张伟宏3邵庆丰1汪永进12
(1.南京师范大学虚拟地理环境教育部重点实验室,江苏 南京 210023)(2.江苏省地理信息资源开发与利用协同创新中心,江苏 南京 210023)(3.浙江师范大学地理与环境科学学院,浙江 金华 321004)
Wang Luyao12Zhao Kan12Huang Wei12Zhang Weihong3Shao Qingfeng1Wang Yongjin12
(1.MOE Key Laboratory of Virtual Geographic Environment,Nanjing Normal University,Nanjing 210023,China)(2.Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing 210023,China)(3.College of Geo
stalagmiteYounger Dryas eventmonsoon failureH1 event
P532; P597.2
基于湖北省神农架龙腑宫洞一支石笋(LFG21)7个U/Th年龄和461组氧、碳同位素数据,建立了末次冰消期12.42~10.53 ka B.P.平均分辨率达3 a的亚洲夏季风强度演化序列. LFG21石笋δ18O详细记录了新仙女木事件(YD)期间的季风突变细节,揭示了YD事件内部的不稳定性. 在YD事件结构特征和转型模式上,石笋记录与格陵兰冰芯δ18O记录具有良好的一致性,支持北高纬驱动机制以及高低纬之间的气候联系. 其中,在~11.71 ka B.P.氧、碳同位素明显正偏,δ18O从-8.6‰快速正偏至-7.9‰,δ13C从-7.4‰快速正偏至-6.0‰,指示YD内部存在百年尺度的弱季风事件,持续时间为~200 a. 这些特征与南京葫芦洞石笋δ18O记录H1事件的内部结构和转型特征十分相似,暗示两者很可能受到同一驱动机制的影响. 通过高、低纬地质资料的对比研究和波谱分析,本文认为YD内部百年尺度季风突变事件可能与热带大洋水汽输送变化导致的亚洲季风区水文循环异常以及太阳活动密切相关.
A 461-mm long stalagmite from Longfugong Cave in Hubei province,cenrtal China,was 230Th dated and measured with stable isotopic analysis to reconstruct a high-resolution(3 a)Asian Monsoon history over a period from 12.42 to 10.53 ka B.P.,equivalent to the Younger Dyras(YD)episode. The overall pattern of δ18O record,characterized by gradual onset but rapid end,agrees well with other high-resolution and precisely-dated speleothem records from Hulu,Yamen and Qingtian Caves. A positive shift of δ18O values from -8.6‰ to -7.9‰ at around 11.71 ka B.P.,which is also mirrored in the carbon isotope composition with δ13C values from -7.4‰ to -6.0‰,indicates a~200 a monsoon failure within the YD. The structures and transitions of YD event are equally registered by the δ18O record of the H1 event(Heinrich 1)from Hulu Cave,possibly implying the same forcing mechanism. The calcite δ18O record,which presents abrupt fluctuations and detailed instabilities in monsoon over the studied interval,shows coherence with ice-core δ18O record from Greenland,supporting the direct linkage between Greenland climate and monsoonal circulation. Based on the comparison with the bulk sedimentary titanium(Ti)records from the Cariaco Basin,we attribute the internal centennial monsoon failure to the southward displacement of the Intertropical Convergence Zone(ITCZ). The statistically significant periodicities of ~128 a(δ13C)and~200 a(δ18O)from the wavelet analysis likely indicate the role of solar activity playing in monsoon,and this is further supported by the 10Be flux record derived from ice core.


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 Ming Yanfang.Abrupt Character of the East Asian Summer Monsoon Recorded in the Annual Layer Thickness of Stalagmites During the Last Deglaciation[J].Journal of Nanjing Normal University(Natural Science Edition),2003,26(01):95.
 Ming Yanfang.Abrupt Character of the East Asian Summer Monsoon Recorded in the Annual Layer Thickness of Stalagmites During the Last Deglaciation[J].Journal of Nanjing Normal University(Natural Science Edition),2003,26(01):95.


通讯联系人:赵侃,博士,讲师,研究方向:全球变化. E-mail:09371@njnu.edu.cn
更新日期/Last Update: 1900-01-01