【英文摘要】We propose to reconstruct a detailed bioclimatic history of the last 50,000 years in the westerlies-dominated Central Asia based on a multi-proxy study of several thick eolian sections. The past 50,000 years are targeted because of the needed chronological resolution and the abundance of AMS-datable charcoals in the eolian sections. Here, the westerlies-dominated Central Asia refers to the region including NW Xinjiang of China and the eastern Kazakhstan that has been the conjunction between the East Asian Monsoon and the westerlies-dominated "European" climate systems. A high-resolution reconstruction of bioclimatic changes from eolian sequences in the proposed study area shall provide a more comprehensive context for understanding hemispheric- and global-scale forcing mechanisms and ocean-atmosphere-continent couplings throughout the past 50,000 years. First, we will develop bioclimatic transfer functions of pollen, snails, delta13C of organic matter, and environmental magnetic parameters along three N-S transects. Our study will then focus on reconstruction of bioclimatic changes during the past 50,000 years. Our approach involves a combination of geophysical proxies (magnetic granulometry and grain size), geochemical proxies (delta 13C of organic matter, elements, and iron geochemistry), and geobiological proxies (pollen, charcoals, and snails).