晚始新世与早中新世东亚气候格局比较的数值模拟研究

新生代东亚气候演变是全球变化领域备受关注的重要科学问题。地质记录研究表明我国古近纪环境为近东西向的带状气候格局，晚渐新世-早中新世东亚气候格局发生重大重组，现代东亚季风与内陆干旱气候格局形成。然而，近些年来一些地质记录和数值模拟研究认为类似现今的东亚季风气候在晚始新世已经形成。因此，本项目拟针对晚始新世与早中新世东亚气候格局问题开展以下工作：（1）优化重建晚始新世（~40 Ma）与早中新世（~20 Ma）的全球古地理；（2）基于优化重建的两个特征时期的古地理边界条件开展东亚气候的数值模拟研究。本项目力争在晚始新世与早中新世的东亚气候格局以及两个时期东亚气候对轨道参数变化响应的敏感性问题上取得新的进展，增进对新生代东亚气候演变的理解。

The East Asian climate change during the Cenozoic era is one among the major contentions of paleoclimatology. Geological records indicate that a zonal climate pattern in China persisted in the Paleogene, and that a major reorganization of East Asian climate occurred in the late Oligocene-early Miocene, with the formation of modern East Asian monsoon and inland aridity. However, in the past decade, some geological records and modeling studies argue that modern-like East Asian monsoon had formed since the late Eocene. Thus, this project aims at (1) reconstructing the late Eocene and early Miocene paleogeographic boundary conditions; (2) simulating the late Eocene and early Miocene East Asian climate based on relatively realistic paleogeographic boundary conditions. These results are expected to improve our understanding on East Asian climate patterns in the Late Eocene and Early Miocene and the sensitivity of East Asian climate to orbital forcing during these two typical periods.