全新世早期弱夏季风事件的精确定位及机制探讨——以湖南莲花洞LHD5石笋为例

发布时间：2018-04-09 13:12

本文选题：全新世早期　切入点：弱夏季风事件　出处：《沉积学报》2016年02期

【摘要】：全新世早期是太阳辐射加强、全球温度上升,并伴随着冰盖消融的重要时期,而其间发生的冷事件以及亚洲季风区的弱夏季风事件的成因一直是全新世早期研究的重点。对亚洲季风—海洋—极地联系研究有着重要的意义。通过分析湖南莲花洞LHD5石笋28个U/Th年龄和535个氧同位素数据重建了全新世亚洲季风演化特征,其中全新世早期分辨率达8年。LHD5石笋记录到YD结束时间为11 748±30 a B.P.,全新世开始于11 684±39 a B.P.,转换时间约为64年,与格陵兰gicc05记录在误差范围内一致。LHD5石笋记录到全新世早期6次弱夏季风事件,事件年龄中心点分别为11 461±34 a B.P.、10 354±36 a B.P.、9 957±25 a B.P.、9 062±36 a B.P.、8 744±23 a B.P.、8 144±24 a B.P.,其δ18O值的波动幅度分别为1.08‰、0.94‰、0.66‰、0.90‰、0.55‰、1.02‰,这些弱季风事件在亚洲季风区具有普遍的区域意义。除8.2 ka事件之外,10 ka B.P.之前的弱季风事件除了受到太阳活动的影响,还受到北大西洋IRD事件的影响,而之后更多地受到太阳活动和ITCZ南移的影响。
[Abstract]:The early Holocene is an important period when solar radiation intensifies and global temperature rises with the melting of the ice sheet. The causes of cold events and weak summer monsoon events in the Asian monsoon region have been the focus of the early Holocene study.It is of great significance to study the Asian monsoon-ocean-polar relationship.Based on the analysis of 28 U/Th ages and 535 oxygen isotopic data of LHD5 stalagmites in Lianhuadong, Hunan Province, the evolution characteristics of Holocene Asian monsoon were reconstructed.The resolution of early Holocene was 8 years. The end time of YD was 11 748 卤30 a B.P., and the beginning of Holocene was 11 684 卤39 a B.P. the transition time was about 64 years.In accordance with the error range recorded by Greenland gicc05, 6 weak summer monsoon events in the early Holocene were recorded by .LHD5 stalagmites.In addition to the 8.2 ka incident, 10 ka B.P.The previous weak monsoon events were affected not only by solar activity, but also by the North Atlantic IRD event, and more by the solar activity and the southward migration of ITCZ.
【作者单位】：西南大学地理科学学院;国土资源部/广西岩溶动力学重点实验室国际岩溶研究中心中国地质科学院岩溶地质研究所;西安交通大学全球环境变化研究院;Department
【基金】：中国地质科学院基本科研业务费项目(YWF201414) 岩溶地质研究所基本科研业务费项目(2014025;201319) 中国地质调查局地调项目(12120113006700)~~
【分类号】：P532

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