MIS3阶段千年尺度突变事件在中国石笋δ^(13)C记录中的印迹  

Imprints of millennial-scale events during the MIS3 revealed by stalagmiteδ^(13)C records in China

作　　者：罗雪琳 周颖 付天祥 聂旻敏 梁怡佳 董进国[1] LUO Xuelin;ZHOU Ying;FU Tianxiang;NIE Minmin;LIANG Yijia;DONG Jinguo(College of Geosciences,Nantong University,Nantong,Jiangsu 226007,China)

机构地区：[1]南通大学地理科学学院,江苏南通226007

出　　处：《中国岩溶》2022年第4期636-647,共12页Carsologica Sinica

基　　金：国家自然科学基金项目(41877287,41472317);江苏省大学生创新训练项目(202110304106Y);黄土与第四纪地质国家重点实验室开放基金(SKLLQG2120)。

摘　　要：基于山西阳泉市莲花洞石笋8个^(230)Th年代和109个δ^(13)C数据,获取了末次冰期54.5~41.1 ka BP期间平均分辨率为120年的δ^(13)C记录。综合对比亚洲季风区29°~41°N之间5条独立定年的、高分辨率石笋δ^(13)C记录表明:不同洞穴石笋δ^(13)C记录在相同生长时段具有较好的重现性,δ^(13)C指标能够有效指示洞穴上覆地区土壤CO_(2)产率,从而反映洞穴外部环境与季风气候的变化。δ^(13)C记录的5个千年尺度亚洲夏季风增强事件在定年误差范围内响应于格陵兰冰芯记录的Dansgaard-Oeschger(DO)10~14事件,而2个弱季风过程与北大西洋钻孔记录Heinrich 5和Heinrich 5a事件密切联系。这种石笋δ^(13)C记录的空间一致性表明亚洲夏季风及其控制下的区域生态环境波动在千年尺度上通过海-气耦合响应于北高纬气候变化。During the last glacial period,a series of millennial-scale abrupt climatic events,including Heinrich events and Dansgaard-Oeschger events,exerted influential and profound impacts on the global climate systems.Due to advantages of high resolution,multiple proxies and ^(230)Th dating methods,Chinese stalagmite δ^(18)O records reveal distinct teleconnections between the climates in the northern high latitudes and the Asian monsoon domain.Generally,during cold Stadials in the northern high latitudes,Asian summer monsoon was weak and stalagmite δ^(18)O values shifted positively,and during warm Interstadials,Asian summer monsoon was strong and stalagmite δ^(18)O values shifted negatively.However,accompanied with the wide application comes a hot debate on the interpretation of stalagmite δ^(18)O.It is suggested that Chinese stalagmite δ^(18)O could possibly reflect Asian summer monsoon which is related with the average monsoonal intensity or the overall moisture transport to China,but could not merely represent local precipitation changes.For instance,during Stadials,under the influence of weak Asian summer monsoon,precipitation in southern China might increase,indicating inconsistent changes of"rainfall"and"wind".Climates in the monsoon marginal regions,namely northern China,are found in consistent behavior in terms of"rainfall"and“wind”changes.Besides,calcite δ^(13)C is also potential for the reconstruction of paleoclimatology and paleo-environment,thus,to some extent,could compensate the shortage of calcite δ^(18)O which lacks changing signals of local environment.Yangquan City in Shanxi Province is located at the Loess Plateau and the northern edge of the Asian monsoon.Multi-proxy records induced from stalagmites in this region can provide us a better understanding of the"wind"and"rainfall"aspects of the monsoonal climate.At an elevation of 1,200 m above sea level,Lianhua Cave(38°10′N,113°43′E)is developed in the Ordovician limestone,with a narrow entrance and passages.Relative humidity in the inne

关 键 词：黄土高原 石笋δ^(13)C记录 深海氧同位素3阶段 气候突变事件 

分 类 号：P532[天文地球—古生物学与地层学]