基于摇蚊亚化石的2万年以来我国东北地区夏季温度定量重建

全球气候变暖导致众多环境问题，明确现代暖期在长期气候变化中的位置，对于未来人类如何适应气候变化具有重要的意义。末次盛冰期以来亚洲季风区的陆地温度定量研究一直是我国学术界关注的热点，但基于不同指标的重建记录显示不同区域之间温度变幅存在较大差异，运用物理意义明确的季节性代用指标对理解气候演变历史及驱动机制至关重要。湖泊摇蚊幼虫亚化石被认为是定量重建夏季温度最有效的生物指标之一，被广泛应用于全球各地的古温度定量研究。本项目拟将已有的东北地区摇蚊-夏季温度转换函数应用于大兴安岭中部地区驼峰岭天池过去50年来的夏季温度重建中，并通过与器测数据对比评估重建结果在长时间尺度温度定量研究中的可行性。基于高分辨率的年代框架，定量重建东北地区过去2万年来的夏季温度变化序列，厘清该地区百-千年尺度气候波动的幅度，并探讨其驱动机制。

Global warming has caused many environmental problems. Ascertaining the position of the modern warm period in the long-term climate change is of great significance to how humans adapt to climate change in the future. The quantitative study of terrestrial temperature in the Asian monsoon region since the Last Glacial Maximum has been the research focus of academic attention in China. However, the reconstructed records based on different indicators show that there are significant differences in temperature fluctuation among different regions. The application of seasonal proxies with clear physical significance is crucial for understanding the history of climate evolution and its driving mechanism. The subfossil chironomids in lakes are one of the most effective biological indicators for the quantitative summer temperature reconstruction, which has been widely used in the quantitative study of paleo-temperature around the world. This study aims to apply the chironomid-based transfer function in northeast China to the summer temperature reconstruction of Lake Tuofengling in the central Greater Khingan Mountains for the last 50 years, and evaluate the feasibility of the reconstruction results in the long-term quantitative temperature research by comparing with the meteorological record. Based on a high-resolution chronological sedimentary core, this study will quantitatively reconstruct the summer temperature series over the past 20,000 years in northeast China, clarify the magnitude of the century-millennia scale climate fluctuations in the region, and explore their driving mechanisms.