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| 重庆金佛洞石笋δ13C记录的全新世千年尺度气候振荡 |
| The Millennial Time Scale Climate Oscillation in the Holocene Revealed by δ13C of Stalagmite from the Jinfo Cave, Chongqing |
| 投稿时间：2018-04-22 修订日期：2018-09-18 |
| DOI：10.14050/j.cnki.1672-9250.2019.47.014 |
| 中文关键词: 全新世;石笋δ13C;千年尺度;气候震荡;金佛山 |
| 英文关键词: Holocene;stalagmite δ13C;millennial time scale;climate oscillations;Jinfo Mountain |
| 基金项目:国家自然科学基金项目（41572158、41072141、41272192）；国家重点研发计划（2016YFC0502301）；中央高校基本科研业务费项目重大项目（XDJK2012A003）。 |
| 作者 | 单位 | E-mail | | 王宝艳1,2, 杨勋林1,2, 孙喜利1,2, 史志超1,2, 刘睿恺1,2 | 1. 西南大学 地理科学学院 岩溶环境重庆市重点实验室, 重庆 400715
2. 国土资源部岩溶生态环境-重庆南川野外基地, 重庆 408435 | xlyang9999@163.com |
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| 中文摘要: |
| 基于重庆市金佛洞石笋J119铀系测年数据和碳同位素数据重建了全新世9.6~1.6 ka B.P.时段的古气候演化序列。分析结果显示：在早全新世的9.6~7.4 ka B.P.期间，J119 δ13C记录呈现出偏负趋势，表明此时段内季风逐渐加强，气候开始变暖湿；中全新世的7.4~4.2 ka B.P.期间，J119 δ13C值整体偏负，与全新世大暖期相对应；在4.2 ka B.P.附近δ13C记录出现较大幅度的迅速偏正，并持续到约2.5 ka B.P.，随后石笋δ13C值出现偏负趋势，表明在4.2 ka B.P.以后气候持续处于干冷状态直到2.5 ka B.P.才有所转暖。在全新世期间，重庆金佛洞石笋清晰地记录了7次千年尺度气候震荡事件，分别发生在大约2.7 ka B.P.、4.2 ka B.P.、5.5 ka B.P.、8.3 ka B.P.、9.4 ka B.P.附近，与大西洋染赤铁矿记录的冷事件2、3、4、5、6相对应。除此之外，J119 δ13C记录显示在7.0~6.7 ka B.P.、7.8~7.3 ka B.P.时段也存在千年尺度震荡，这些突变事件与董哥洞石笋氧同位素记录的弱季风事件（2.7 ka B.P.、4.4 ka B.P.、5.5 ka B.P.、6.3 ka B.P.、7.2 ka B.P.、8.3 ka B.P.）也存在一定的对应关系。因此，本文研究表明金佛山石笋δ13C记录能够反映全新世千年尺度的气候事件，并可以与石笋δ18O记录进行相互对比和验证。 |
| 英文摘要: |
| We reconstructed the paleoclimate evolutionary sequence in the Asian Summer Monsoon area from 9.6 to 1.6 ka B.P. on the basis of δ13C data collected from a continuous growing stalagmite (J119) collected in the Jinfo Cave, Chongqing, China. In the period of from 9.6 to 7.4 ka B.P., the δ13C of J119 showed a negative trend, indicating the East Asian monsoon strengthened gradually and the climate became warm and wet. In the period of from 7.4 to 4.2 ka B.P., the δ13C of J119 turned to be very negative, corresponding to the Holocene Thermal Optimum. In the period of 4.2 to 2.5 ka B.P., the δ13C of J119 showed a continuous positive trend, revealing that the climate became dry and cold. After 2.5 ka B.P., the δ13C of stalagmites turned to be negative slightly, indicating the climate became warmer. The Jinfo mountain experienced 7 times of millennial climate oscillation, occurred at 2.7, 4.2, 5.5, 8.3 and 9.4 ka B.P., respectively, in the Holocene, which corresponded to Bond 2-6 events (the north Atlantic hematite record). In addition, the δ13C of J119 recorded significant other two climate oscillations of 7.0-6.7 ka B.P.. and 7.8-7.3 ka B.P. Combined with other published stalagmite records in the Asian Summer Monsoon region, the weak monsoon events recorded by δ13C of J119 consisted well with those recorded by oxygen isotopes. Therefore, this study further showed that δ13C of Jinfo Mountain stalagmite could record millennial scale climate events in the Holocene and could be verified by the stalagmites δ18O records. |
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