温度和降水定量化是古气候研究的核心内容和目标之一。陆生蜗牛壳体碳酸盐记录了生长环境的气候信息，是定量化古气候重建的重要研究对象。本项目拟沿着降水、温度梯度带(东南--西北方向)，对我国中部和东部季风区蜗牛壳体碳同位素组成的现代过程进行系统研究，查清不同种属蜗牛壳体碳同位素组成对环境气候响应的有效性和灵敏度，评估其误差；建立蜗牛壳体碳同位素组成与温度、降水的现代过程定量模型；通过室内控制实验研究，阐明不同种蜗牛对温度、降水响应差异性的机理；建立黄土高原末次盛冰期(LGM)以来高分辨率的温度和降水变化序列，揭示该时期东亚季风的演化规律。项目的开展将为在中国地区开展的东亚古季风气候定量化重建提供有效的方法和翔实数据。

The quantitative study of temperature and precipitation has been part of the core and objective of palaeoclimate research. The carbonate shell of land snail, which acts as a good record of the local environmental information during the snail’s growth period, has been an important potential subject in the quantitative palaeoclimate reconstruction. Therefore, we plans to undertake the systematic study of the snail shell carbon isotope composition in modern process in monsoon area of central and eastern China, along the southeast-northwest transect with a significant precipitation-temperature gradient, aiming to 1) explore the effectiveness and sensitivity of different species of snails when using them to reflect the environmental information and evaluate the errors in these results; 2) build a modern quantitative model to explain the relationship between shell carbon isotope composition with precipitation and temperature; 3) illustrate the difference in mechanisms when using different snail species to reflect the information of precipitation and temperature by using some technology in lab; 4) clarify the process of temperature and precipitation changing in a high-resolution in Chinese Loess Plateau since LGM and then to uncover the evolution of East Asian monsoon in this period. This program would provide a systematic methodology as well as reliable and substantive data for the quantitative palaeoclimate reconstruction in the monsoon region of China.