| MIS 5a/5b时期亚洲夏季风变化的高分辨率石笋记录 |
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| 引用本文： | 张涛涛,李廷勇,韩立银,程 海,李俊云,赵 鑫,周菁俐.MIS 5a/5b时期亚洲夏季风变化的高分辨率石笋记录[J].中国岩溶,2017,36(2):162-170. |
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| 作者姓名： | 张涛涛 李廷勇 韩立银 程 海 李俊云 赵 鑫 周菁俐 |
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| 作者单位： | 1.西南大学地理科学学院岩溶环境学重庆重点实验室/国土资源部岩溶生态环境—重庆南川野外研究基地/中国地质科学院岩溶地质研究所/国土资源部、广西岩溶动力学重点实验室 |
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| 基金项目： | 国家自然科学基金项目(41172165, 41302138, 41440020)；中央高校基本科研业务费专项资金项目(XDJK2013A012, XDJK2014C010)；岩溶动力学重点实验室开放基金资助课题(KDL201301)和西南大学博士基金项目(SWU114022) |
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| 摘 要： | 由于深海氧同位素阶段5时期 (Marine Isotope Stage 5, MIS 5)高分辨率的亚洲夏季风记录较少，限制了对该时期亚洲夏季风变化的认识。本文利用重庆金佛山羊口洞石笋的δ18O记录，重建了MIS 5a/5b时期平均分辨率为38年的亚洲夏季风演变历史。发现该时段亚洲夏季风在千年—百年尺度上与北大西洋地区气候变化存在紧密联系。得益于误差小于0.4%的230Th测年结果，本文标定了中国间冰阶(Chinese Interstadial, CIS)21的开始时间为84.6±0.3 ka BP，CIS 22的起止时间分别为91.2±0.3 ka BP和88.9±0.3 ka BP。此外，羊口洞石笋记录的CIS 21和CIS 22的变化模式与格陵兰记录不同，而与南极冰芯记录呈反相对应，可能表示在此阶段亚洲夏季风受到了南半球气候变化的影响。
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| 关 键 词： | 亚洲夏季风 石笋δ18O 深海氧同位素阶段5a/5b 230Th年代 南半球气候变化 |
Variation of the Asian summer monsoon during the MIS 5a/5b period inferred from a new high-resolution stalagmite record |
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| ZHANG Taotao,LI Tingyong,HAN Liyin,CHENG Hai,LI Junyun,ZHAO Xin and ZHOU Jingli.Variation of the Asian summer monsoon during the MIS 5a/5b period inferred from a new high-resolution stalagmite record[J].Carsologica Sinica,2017,36(2):162-170. |
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| Authors: | ZHANG Taotao LI Tingyong HAN Liyin CHENG Hai LI Junyun ZHAO Xin and ZHOU Jingli |
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| Institution: | 1.Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University/Field Scientific Observation & Research Base of Karst Eco-environments at Nanchuan in Chongqing, Ministry of Land and Resources of China/Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics,MLR & GZAR2.Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University3.Institute of Global Environmental Change, Xi’an Jiaotong University |
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| Abstract: | Due to the paucity of the high-resolution records of the Asian summer monsoon (ASM) during the marine isotope stage (MIS) 5, our understanding about the ASM in this period is limited. In this study, a 38-yr resolution stalagmite oxygen isotope record from the Yangkou Cave, Chongqing, southwestern China, is used to reconstruct the detailed evolution of the ASM during the period of MIS 5a/5b. The Yangkou record exhibits a close correlation between the ASM and the climate of the North Atlantic at a centennial-millennial-scale. In terms of the precise 230Th dating with error less than 0.4%, the onset and termination of Chinese Interstadial (CIS) 22 are constrained to 91.2±0.3 ka BP and 88.9±0.3 ka BP, respectively, and the beginning of the CIS 21 is defined at 84.6±0.3 ka BP. In addition, the evolution pattern of CIS 22 and CIS 21 recorded in the stalagmite from the Yangkou Cave is slightly different from those recorded in NGRIP,which is anti-phased with the trend of temperature change in the Antarctica. We speculate that the ASM during MIS 5a/5b may be affected by climate variation in the southern hemisphere. |
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