Arid Zone Research ›› 2022, Vol. 39 ›› Issue (4): 1027-1035.doi: 10.13866/j.azr.2022.04.04

• Weather and Applied Climate • Previous Articles     Next Articles

Last glacial millennium-scale climate event recorded by loess sediments in Linfen Basin

TIAN Qingchun1,2(),SHI Xiaojing1(),HAO Xiaolong1   

  1. 1. College of Geographical Sciences, Shanxi Normal University, Taiyuan 030000, Shanxi, China
    2. Academy of Chinese Early Civilization, Shanxi Normal University, Taiyuan 030000, Shanxi, China
  • Received:2022-01-08 Revised:2022-02-24 Online:2022-07-15 Published:2022-09-26
  • Contact: Xiaojing SHI E-mail:tianqch2006@126.com;shixj42725@qq.com

Abstract:

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.

Key words: last glacial, Heinrich event, Dansgaard-Oeschger cycle, Dingcun section, Linfen Basin