| 亚洲夏季风DO12气候事件的响应模式 |
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| 引用本文： | 张晗,黄伟,蒋莹,陈子元,沈川洲,董进国.亚洲夏季风DO12气候事件的响应模式[J].沉积学报,2022,40(3):765-773. |
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| 作者姓名： | 张晗 黄伟 蒋莹 陈子元 沈川洲 董进国 |
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| 作者单位： | 1.南通大学地理科学学院, 江苏 南通 226007 |
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| 基金项目： | 国家自然科学基金（41102216,41472317,41877287）； |
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| 摘 要： | 亚洲季风气候响应的Dansgaard?Oeschger（DO）事件模式是目前古气候研究的热点之一，其是否表现为单一模式，还是存在多种模式仍有争议。基于山西龙洞13个铀钍年代和239个氧同位素（δ18O）数据重建了末次冰期48~41 ka B.P.时段东亚夏季风演化历史。石笋L2清晰记录了H5、DO12和DO11等千年尺度气候事件，其变化特征与亚洲其他石笋记录呈现出良好的一致性，并与格陵兰冰芯记录一一对应，表明高、低纬之间紧密的气候联系。在DO12事件过程中，L2 δ18O值先是持续偏轻后又逐渐变重，指示亚洲夏季风强度持续增强后略有减弱，与格陵兰冰芯记录的温度持续降低模式迥异；不同区域记录对比发现，亚洲夏季风和热带低纬水文过程响应的DO12事件过程表现为不对称倒“V”形，这可能与南大洋潜热释放及越赤道气流强/弱变化、低纬热带辐合带逐步北进/南退有关。
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| 关 键 词： | 末次冰期 黄土高原 石笋 东亚夏季风 DO12事件 |
| 收稿时间： | 2020-04-09 |
Structure Characteristics of DO 12 Climate Abrupt Event: Evidence from the stalagmite record,Shanxi province,in northern China |
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| ZHANG Han,HUANG Wei,JIANG Ying,CHEN ZiYuan,SHEN ChuanChou,DONG JinGuo.Structure Characteristics of DO 12 Climate Abrupt Event: Evidence from the stalagmite record,Shanxi province,in northern China[J].Acta Sedimentologica Sinica,2022,40(3):765-773. |
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| Authors: | ZHANG Han HUANG Wei JIANG Ying CHEN ZiYuan SHEN ChuanChou DONG JinGuo |
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| Institution: | 1.College of Geography Science, Nantong University, Nantong, Jiangsu 226007, China2.Department of Geographical Science, Yichun University, Yichun, Jiangxi 336000, China3.Department of Geosciences, National Taiwan University, Taipei, 10617 |
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| Abstract: | To date， the pattern of Dansgaard-Oeschger （DO） events in response to monsoon climate is a question of greatest interest in paleoclimate research. Whether it is manifested as a single pattern or as multiple patterns remains controversial. A high-resolution oxygen isotope profile established with 239 oxygen isotope and 15 230Th dates from the Dragon Cave， Shanxi province， North China， provides a detailed history of the East Asian summer monsoon （EASM） variation during the middle marine isotope stage （MIS 3）. Our records show significant millennial-scale variability， and are consistent in rate with DO events 11?12 and Heinrich event 5 recorded in other Chinese caves and in the Greenland ice core. Their close consistency supports a strong climatic link between high and low latitudes.Early in the DO 12 event， the δ18O values of stalagmite L2 remained negative， indicating the persistent intensification of the Asian summer monsoon， which is quite different from the pattern of stepwise temperature decrease recorded in the Greenland ice core after approaching the maximum. Comparison of records from different regions demonstrates that the response to the DO event of the Asian summer monsoon， and to the tropical low-latitude hydrological process， was characterized by an asymmetrical inverted V-shape. This may have been related to the release of latent heat from the southern ocean and a strengthened cross-equatorial flow （later weakened）， resulting in the intertropical convergence zone （ITCZ） gradually north （south）. By extension， the summer monsoon in Northern China started to increase continuously， and eventually wane. |
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