临汾盆地黄土记录的末次间冰期气候的不稳定性特征  

Instability characteristics of the last interglacial age recorded by loess in Linfen Basin

作　　者：裴瑜 田庆春 杜五喜 赵格格 PEI Yu;TIAN Qingchun;DU Wuxi;ZHAO Gege(College of Geographical Sciences,Shanxi Normal University,Linfen 041004,China)

机构地区：[1]山西师范大学地理科学学院,临汾041004

出　　处：《干旱区资源与环境》2020年第9期89-94,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(41701223)资助。

摘　　要：文中在光释光测年基础上,通过对临汾盆地黄土沉积物粒度、磁化率和全铁含量指标进行分析,探讨末次间冰期临汾盆地的气候演化特征。研究表明:临汾盆地末次间冰期气候可分为3次暖期,2次冷期,共5个亚阶段,与全球深海氧同位素MIS5阶段中的5个亚段有很好的对应关系;中值粒径在MIS5b阶段比MIS5d阶段明显大,也就是说5b要比5d冷,这与许多北半球高分辨率的气候记录相似,可能不仅是一种局地特征,也是北半球的普遍现象;同时各亚段内次一级的气候波动较多,MIS5c亚阶段全铁含量呈现"高-低-高"的变化趋势,MIS5e阶段气候温暖湿润,冷暖交替变化不明显,状态稳定。Based on the Optically Stimulated Luminescence(OSL) dating, this study discussed the climate evolution characteristics of Linfen basin during the last interglacial period by analyzing the grain size, magnetic susceptibility and total Fe content(TFe) of loess sediments in Linfen basin. The results show that the last interglacial climate in Linfen basin could be divided into five sub-stages in total: three warm periods and two cold periods, which had a good correspondence with 5 sub-segments of Marine Isotope stage 5(MIS5). The median particle diameter in the MIS5 b is significantly larger than that in the MIS5 d, which means that 5 b was colder than 5 d. The record is similar to many high-resolution climate records in the northern hemisphere, indicating that this might not only be a local feature, but also a common phenomenon in the northern hemisphere. At the same time, the sub-grade climate fluctuated a lot in each sub-segment. The total Fe content(TFe) in the sub-stage of MIS5 c showed a "high-low-high" trend, and the climate of MIS 5 e was warm and humid, the alternation of cold and warm was not obvious, and the state was stable.

关 键 词：临汾盆地 黄土 末次间冰期 气候不稳定性 

分 类 号：P467[天文地球—大气科学及气象学]