亚洲季风变化对我国自然环境格局变化起到控制作用，中国石笋记录显示全新世亚洲夏季风的框架变化主要受控于夏季太阳辐射变化，但石笋氧同位素记录夏季风强度变化受到质疑，也与黄土等其他记录的夏季风框架变化存在差异。本项研究拟选择我国季风区到西风区过渡带的阿拉善高原，利用目前仍是湖泊或湿地的沉积岩芯记录，依靠陆生植物残体和风沙沉积的OSL测年建立年代框架，开展孢粉、单烃碳同位素、碳酸盐和介形虫氧同位素及常规指标测量，建立全新世夏季风的框架变化和干旱事件序列，追踪全新世夏季风向内陆扩展的范围，认识季风和西风环流的相互作用。

Variations in the Asia summer monsoon play a fundamental role in the evolution of China's natural environment. Stalagmite records from Chinese caves revealed that the Asian summer monsoon variability broadly follows Northern Hemisphere summer insolation during the Holocene. However, this is different from monsoon pattern derived from the loess and other records. Furthermore, the climatic indication of speleothem oxygen isotope is still under intense debate. In this research, we choose small lakes/wetlands in the Alashan Plateau located in the transitional zone from the monsoon region to the westerly region, to carry out a multi-proxy investigation (e.g. pollen, carbon isotope, oxygen isotope of ostracode shells and carbonate) on lacustrine sediment cores. On the basis of reliable chronology established by 14C dating of terrestrial plants and OSL dating of eolian sediments, this study is aiming to reconstruct the general pattern of summer monsoon change and the drought event series during the Holocene, track the extent of inland penetration of monsoon rainfall in that period, and finally understand the interaction between the monsoon and westerly circulation.