蔡炳贵^1,2,,
李苗发³,
王芳³,
王立胜⁴,
王学锋⁴,
马志邦⁴,
闫禹³
1. 福建师范大学湿润亚热带山地生态国家重点实验室培育基地, 福建 福州 350007
2. 福建师范大学地理研究所, 福建 福州 350007
3. 福建师范大学地理科学学院, 福建 福州 350007
4. 中国科学院地质与地球物理研究所, 中国科学院新生代地质与环境重点实验室, 北京 100029

基金项目: 国家重点基础研究发展计划项目（批准号：2017YFA0603401）、国家自然科学基金项目（批准号：41661144021和41272197）和福建师范大学校创新团队基金项目（批准号：IRTL1705）共同资助


详细信息

作者简介: 蔡炳贵, 男, 44岁, 副研究员, 全球变化与第四纪环境演变研究, E-mail:bg-cai@fjnu.edu.cn, bingguicai@qq.com

中图分类号: P597⁺.2;P534.63⁺2;P532

收稿日期:2019-01-23
修回日期:2019-03-13
刊出日期:2019-05-30

Variability of Eastern Asian summer monsoon during 2.8 ka climate event recorded in a stalagmite oxygen isotope sequence from Miaodong Cave, Northeastern China

Cai Binggui^1,2,,
Li Miaofa³,
Wang Fang³,
Wang Lisheng⁴,
Wang Xuefeng⁴,
Ma Zhibang⁴,
Yan Yu³
1. Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350007, Fujian
2. Institute of Geography, Fujian Normal University, Fuzhou 350007, Fujian
3. School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, Fujian
4. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029


MSC: P597⁺.2;P534.63⁺2;P532

--> Received Date: 23 January 2019
Revised Date: 13 March 2019
Publish Date: 30 May 2019


摘要
摘要:本研究利用辽宁本溪庙洞石笋MD12，通过²³⁰Th定年和高分辨率氧同位素分析，并集成庙洞另一支石笋MD11序列，重建了3.04~2.60 ka B.P.时期辽东地区夏季风（降水）变化历史。该石笋氧同位素序列记录了2.8 ka事件的详细过程，事件的核心阶段起止时间约为2.76~2.66 ka B.P.，中心点位于2.68 ka B.P.，稍微晚于西南石笋氧同位素记录（约2.71 ka B.P.），但是在事件的开始时间上，庙洞石笋氧同位素记录比西南石笋氧同位素记录晚了约100年。因此，庙洞石笋氧同位素记录与西南石笋氧同位素记录中显示的缓慢减弱-快速增强模式不同，2.8 ka事件在辽东石笋氧同位素记录中表现为快速减弱-突然增强的变化模式，与太阳活动代用指标一致变化，支持太阳活动是2.8 ka弱季风事件驱动因子的观点。庙洞石笋氧同位素快速响应太阳活动的变化特征，说明其动力学机制可能是太阳活动减弱导致北半球高纬度地区温度降低，然后通过大气"遥相关"作用影响东亚夏季风。
关键词: 2.8 ka事件/
东亚夏季风/
石笋/
氧同位素/
中国东北

Abstract:The 2.8 ka cold event is one of well known abruptly climate events during the Late Holocene. Previous documents showed weak Eastern Asian Summer Monsoon(EASM) and less precipitation in the northern margin of EASM area during 2.8 ka event. The forcing of this event has been pointed to Solar activity, but the detail forcing mechanism is still unclear. Considering the significantly negative excursion of solar activity during 2.8 ka, high resolution record of EASM with well age constraining is helpful for us to better understand this mechanism. In this study, stalagmite MD12 from Miaodong Cave(41°03'N, 125°31'E), Northeastern China were analyzed. The mineral composition of stalagmite MD12 is pure calcite. Total of 5 ²³⁰Th dating were performed on MC-ICPMS. Total of 90 subsamples for stable isotope measurement were drilled(80 along the vertical growth axle and 10 along horizontal layer at 2 depths for "Hendy Test"), and analysed with MAT 253 coupling with Gasbench-Ⅱ. The MD12 isotope sequence covers interval of 2.92~2.60 ka B. P. The MD12 sequence was then composited with the other published oxgen isotope time series also from Miaodong cave, named MD11, to build the Miaodong stalagmite oxygen isotope sequence covering 3.04~2.60 ka B. P. The variability of Miaodong stalagmite oxygen isotope is interpreted as change of EASM intensity or monsoon precipitation in this area. Based on these ages with low errors(two sigma, 18 to 25 years), the Miaodong record give a detail evolution of EASM and precise transfer time of 2.8 ka event. From 2.88 ka B. P. to 2.62 ka B. P., the Miaodong record exhibits two weak EASM intervals, 2.81~2.87 ka B. P. and 2.76~2.66 ka B. P. respectively. The later one, covering about 110 years, is the key interval of 2.8 ka event, and exhibits a symmetrical shifting process. The EASM abruptly decrease at around 2.76 ka B. P., and reached its worst state at about 2.68 ka B. P., following by an abruptly strengthening process. This transfer point(2.68 ka B. P.) is little younger than those stalagmite records from Southwestern China(around 2.71 ka B. P.), but coincides with the solar minimum and cold event around Greenland Island well. In general, the evolution of EASM indicated by Miaodong record corresponds to those of total solar irradiance(TSI) without any delay, indicating solar activity forcing via a fast dynamic mechanism. Unlike with southwestern records which show gradually decrease of EASM from about 2.88 ka B. P. until 2.71 ka B. P. and abruptly increase from then on. The instantaneously response of Miaodong record to ΔTSI without any delay indicates that the decrease of TSI maybe results in intense cold climate in the area surrounding the Greenland Island and the Northern Atlantic, and then decreases the EASM via atmospheric remote-correlation.
Key words:2.8 ka Event/
Eastern Asian Summer Monsoon(EASM)/
stalagmite/
oxygen isotope/
Northeastern China



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