临汾盆地黄土沉积记录的末次冰期千年尺度气候事件
收稿日期: 2022-01-08
修回日期: 2022-02-24
网络出版日期: 2022-09-26
基金资助
国家自然科学基金项目(41701223)
Last glacial millennium-scale climate event recorded by loess sediments in Linfen Basin
Received date: 2022-01-08
Revised date: 2022-02-24
Online published: 2022-09-26
对临汾盆地丁村剖面进行光释光测年,利用粒度年龄模型重建该地区的年代序列,对比分析粒度、频率磁化率和色度等气候代用指标,旨在反映千年尺度气候突变事件在临汾盆地的表现和区域性特征,揭示了东亚季风区末次冰期以来的气候不稳定性与北大西洋地区存在的联系。结果表明：（1） 丁村剖面中值粒径和频率磁化率曲线清晰地记录了80~20 ka BP间的5次Heinrich事件和19次Dansgaard-Oeschger（D-O）旋回,其中,H2和H6事件变化幅度最大,信号变化最明显,H5事件次之,H3和H4事件最小,反映了该地气候不仅受大尺度范围气候变化的控制,还受区域气候变化的影响。（2） 丁村剖面记录的气候事件与格陵兰冰芯δ18O、黄土高原西部的李家塬剖面以及西风区则克台和塔吉克斯坦剖面均具有很好的对应关系,结合已有研究表明,中国季风区的气候快速波动幅度受西风和东亚夏季风共同影响。
关键词： 末次冰期; Heinrich事件; Dansgaard-Oeschger旋回; 丁村剖面; 临汾盆地
田庆春,石小静,郝晓龙 . 临汾盆地黄土沉积记录的末次冰期千年尺度气候事件[J]. 干旱区研究, 2022 , 39(4) : 1027 -1035 . DOI: 10.13866/j.azr.2022.04.04
Global change is a hotspot of current geography research, among which the millennium-scale climate events during the last glacial stage are the focus of global change research. Optical luminescence dating was conducted on the Dingcun section of the Linfen Basin, and the grain age model was used to reconstruct the chronological sequence of the area. In addition, the climate proxy indicators such as grain size, frequency magnetic susceptibility, and chromaticity were compared and analyzed to investigate the change of millennium-scale climate abrupt events in the Linfen Basin. The performance and regional characteristics revealed the relationship between climate instability in the East Asian monsoon region since the last glacial period and that in the North Atlantic region. Results showed that the median particle size and frequency magnetic susceptibility curves of the Dingcun section clearly recorded five Heinrich events and 19 Dansgaard-Oeschger cycles between 80 and 20 ka BP. The change was evident, followed by the H5 event, and the H3 and H4 events were the smallest, indicating the local climate was not only controlled by large-scale climate changes, but also affected by regional climate changes. Moreover, climatic events recorded in the Dingcun section had a good correlation with the Greenland ice core δ18O, Lijiayuan section in the western Loess Plateau, and Zeketai and Tajikistan sections in the westerly region. Furthermore, the magnitude was affected by the westerly wind and East Asian summer monsoon.
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