WU Lijie, SHI Jiansheng, GUO Jiao, XU Jianming,CHEN Hongyun, DONG Qiuyao, WANG Chengmin
（Institute of Hydrogeology and Environmental Geology; CAGS; Shijiazhuang 050061; China）;

 

Abstract: By the systematic measurement and analysis of magnetic susceptibility, Rb/Sr ratio, total Fe content(TFe), chemical index of alteration(CIA) and OSL dating data of the Jinding malan loess in the north-central Loess Plateau, and the paleoclimate change of the Jinding section during Marine Isotope Stage (MIS)3 are discussed. Results indicate that the general characteristics of paleoclimate change of the Jinding section during MIS3 are relatively warm and humid with the cold and warmclimatefluctuation, which could include 5stages, 51.6~44.9ka B.P., a relatively week warm and humid climate interval；42.0~39.9 ka B.P., a warm and humid climate interval；37.4~27.8 ka B.P., a relatively strong warm and humid climate interval；44.9~42.0 ka B.P. and 39.9~37.4 ka B.P., dry and cold climate intervals. The formation mechanism of the climate change during MIS3 in Jinding suggests that the increasing solar radiation of the northern hemisphere leads to the warming effect more directly, but the coupling mechanism by a high latitude forcing and tropic driving factors remains to be further research.

 

Key words: magnetic susceptibility, East Asian Summer Monsoon, global climate change, ITCZ

 

EARTH AND ENVIRONMENT Vol. 43, No.4, Tot No.306, 2015, Page 425-431