基于植硅体的渭河盆地和榆社盆地上新世季风气候定量重建

研究上新世暖期东亚季风的演化规律及其驱动机制，有助于理解当今全球变暖背景下东亚季风降水的变化趋势。本项目通过对渭河盆地和榆社盆地上新世沉积序列进行野外考察、采样和植硅体提取分析，结合已有年代控制，获得上新世植硅体组合特征。基于植硅体组合分析重建古植被，基于新的现代植被与气候定量关系数据库定量重建上新世降水量和温度。将定量重建结果与全球和区域气候记录、以及数值模拟结果进行对比，探讨东亚季风降水对上新世暖期的响应机制。本项目为预测全球变暖背景下东亚季风的变化提供科学依据。

The study of evolution and driving mechanism of East Asian monsoon is helpful to understand the dynamic of East Asian monsoon precipitation under the background of present global temperature rise. Through field investigation, sampling and phytoliths analysis of the Pliocene sedimentary sequences in Weihe basin and Yushe basin, and combine with the existed age control, this project obtained the phytolith assemblages sequence during the Pliocene. Reconstruction of palaeo-vegetation based on phytolith assemblages analysis, and quantitative reconstruct Pliocene precipitation and temperature changes based on newly built modern vegetation database. Through compare the reconstructed results with global and regional climate records and numerical simulation results, we try to explore the response mechanism of East Asian monsoon precipitation to the Pliocene warm period. This study provides scientific basis for predicting future changes of East Asian monsoon precipitation.