末次冰消期至冰后期区域水文过程对气候变化的响应，对于评估全球变暖背景下我国降水模式演变趋势具有重要意义。本项目选择位于内蒙古中东部的达里湖为研究对象，通过DL04沉积岩芯（长11.83 m，AMS 14C年龄控制点21个）的介形虫组合和壳体化学综合分析，建立最近16,000年达里湖介形虫动物群演替和介形虫壳体化学变化的高分辨率时间序列；结合现代过程研究数据，定量重建湖泊水深和湖水盐度的变化过程，进而恢复湖区降水演变历史；通过区域和全球对比，探讨不同时间尺度东亚季风边缘区降水变化的驱动机制，为深入认识我国北方降水变化对全球变暖的响应方式、预估未来降水变化趋势提供古生物学和地球化学依据。

Knowledge on the responses of regional hydrology to climate change is vital for predicting changes in the humidity pattern across China in the context of global warming. The DL04 sediment core recovered from the depo-center of Dali Lake, central-eastern Inner Mongolia provides continuous archives for the hydrological and climatic variations during the past 16,000 years in the lake area. The core is 11.83 m long and has 21 AMS 14C age control-points, and has a temporal resolution of ca. 13 yr/cm. We propose to make detailed analyses on the species assemblage and shell chemistry of the ostracodes in the core, to reveal the biological evolution of ostracodes, as well as the changes in their shell chemistry during the past 16,000 years. Calibration datasets derived from our studies on the recent ostracode fauna in the area will also be utilized, in conjunction with the core data, to infer variations in the lake level and water salinity in the past. Changes in precipitation over the lake area will then be reconstructed. Afterwards, extensive discussion will be made on the physical mechanisms responsible for the changes in precipitation in the monsoon marginal area on various time scales. Our work will provide valuable data for understanding the responses of regional hydrology to climate change, as well as for predicting humidity change across northern China in the future.