从总体趋势来看，中上新世暖期（3.264-3.025 Ma）之后东亚季风气候出现转变，但其转变机制仍存在争议。利用较新的地球系统模式CESM 1.0.4开展数值模拟，充分考虑动力植被反馈与气溶胶气候效应，模拟中上新世暖期及其之后东亚季风气候特征，并与地质记录进行对比。全面分析中上新世暖期之后青藏高原隆升（地形）和全球变冷（冰盖+大气温室气体）对东亚季风气候的影响，深入比较两者对东亚冬夏季风和亚洲内陆干旱化的影响差异。目前，国际上鲜有关于中上新世之后东亚季风气候转变机制的耦合模拟研究。本项目的及时开展有望深入揭示东亚古季风气候演变机制，同时为深入认识青藏高原隆升和全球变冷对东亚季风气候演变的影响提供模拟依据。

From long-term trend, the East Asian monsoon climate changed largely after mid-Pliocene warm period (3.264-3.025 Ma), but the underlying mechanisms are still the issues in debate. Using more recent Community Earth System Model version 1.0.4 (CESM 1.0.4) and considering the dynamical vegetation feedback and climate effects of aerosol, several simulations are planned to conduct to model the climate in and after mid-Pliocene warm period. The contribution from the uplift of Tibetan Plateau (topography height) and global cooling (ice sheet and atmospheric greenhouse gas concentration) to the East Asian monsoon change and inland Asian drying will be comprehensively analyzed. Up to now, there are very few studies concerning the changed East Asian monsoon climate after mid-Pliocene warm period. Therefore, this project is expected to further reveal the evolution mechanisms of East Asian paleomonsoon climate and provide a scientific reference for deeply understanding the effects of the uplift of Tibetan Plateau and Global cooling on the East Asian monsoon climate change.