EASTERN ASIAN SUMMER MONSOON VARIATION DURING MIS5e AS RECORDED BY PALEOSOL S₁ AT JIUZHOUTAI LOESS SECTION

Proxies of the Eastern Asian Summer Monsoon (EASM)-magnetic susceptibility depending on frequency,carbonate content and soil color of paleosol S₁ of Jiuzhoutai loess-paleosol profile whose accumulative rate is high and which is located in western Chinese Loess Plateau have been measured. Synthesis analysis of the obtained data deduced a decline event of EASM at the beginning of MIS5e, and then the intensity of EASM increased quickly until the last interglacial. Early MIS5e EASM is stronger than the late MIS5e one, and the middle MIS5e is the weakest. The gentle change of MIS5e EASM has no characters of the abrupt change of GRIP oxygen isotope, suggesting the EASM is relative stable during MIS5e. The surface sea temperature and sea level in the west part of the Pacific is relatively high during early and late MIS5e and relatively low during middle MIS5e, consistent with the change of EASM, meaning that environmental change of the west part of the Pacific partly controlled the change of the EASM. Previous studies on Holocene EASM suggested that early Holocene EASM is stronger than late Holocene one, and middle Holocene is relatively dry. The same character of EASM change of MIS5e and Holocene may reveal the inherence mechanism of EASM change.