利用石笋包裹体定量化研究末次冰消期以来东亚季风区的水热配置关系

末次冰消期以来东亚季风区温度、降水变化及其配置关系（即水热配置）一直存在争议，定量化研究更有难度。中国石笋古气候研究取得了举世瞩目的成果，但是石笋δ18O信号的复杂性阻碍了对东亚季风气候变化的深入理解，亟需开发新指标，进行多指标、定量化研究。本项目拟利用高精度230Th定年和最新发展的石笋包裹体测试分析技术，对湖北龙洞、赣北筒子洞和涌泉洞石笋进行测试分析，率先定量化重建末次冰消期以来东亚季风区的温度变化。洞内温度通常为当地年均温，该指标物理意义明确，受季节影响较小，可尝试解决“全新世温度难题”（重建记录与模拟结果不一致）。结合洞穴监测，验证包裹体定量重建古温度的可靠性，评估温度对石笋δ18O的影响，进一步明确石笋δ18O的气候意义。建立赣北和湖北石笋的稳定同位素、微量元素和流体包裹体多指标记录，并与其他地质记录进行对比分析，厘清末次冰消期以来东亚季风区水热配置关系变化及其影响机制。

The East Asian monsoon plays a critical role in the global climate system, and is also vital to the livelihood of billions of people in the region. Over the past two decades, remarkable success has been achieved in reconstructing East Asian monsoon history on different timescales, however, there are still disputes about the temperature changes and the spatial-temporal distributions of monsoon precipitation since the last deglaciation in the East Asian monsoon region and their influencing mechanisms, it is more difficult to quantitatively reconstruct the paleotemperature and paleo-precipitation. Cave climate records have been significant in characterizing the East Asian monsoon changes on different timescales, however, the δ18O proxy have recently been questioned on which aspect of monsoon variability that they could represent. Therefore, multi-proxy or quantitative reconstruction method should be developed for speleothem study. ..We have already collected speleothem samples from Tongzi and Yongquan Caves, Jiangxi Province and Dragon Cave, Hubei Province. On the basis of high-precisely U-Th dating and high-resolution multi-proxy records (stable isotope, trace elements ratios and fluid inclusion paleotemperature), we will quantify the East Asian monsoon changes during the last deglaciation. By using the newly developed analysis method of speleothem fluid inclusion, we will take the lead in quantitatively reconstructing the variations in paleotemperature since the last deglaciation. Comparing with paleotemperature records obtained from ice core, loess and lake sediments and other records, we will investigate the temperature changes in the East Asian monsoon region since the last deglaciation and explore its possible mechanism. Combining with cave monitoring results and multi-proxy records of modern stalagmites, the reliability of quantitatively reconstructed temperature by speleothem fluid inclusion will be verified, and climatic significance and influencing factors of speleothem oxygen isotope proxy in the East Asian monsoon region will be further clarified. We will also take the lead in using the multi-proxy records to reconstruct the variations in monsoon precipitation in northern Jiangxi and Hubei since the last deglaciation. By comparing with other records in the Asian monsoon region, we will clarify the spatial-temporal variations of the monsoon precipitation and temperature since the last deglaciation and its possible influencing mechanism.