末次冰期东亚区域气候变化的情景和机制研究

Study on Scenarios and Mechanism of the Regional Climate Change of East Asia in the Last Ice-Age

用一嵌套在全球大气环流模式中的区域气候模式，通过数值试验和对内外因作用的机制分析，探讨了以末次冰期为背景的大尺度强迫引起的大气环流和区域内下垫面条件异常等中尺度强迫影响区域气候变化的过程和机制。大尺度强迫和区域内局地的中尺度强迫通过不同的热力和动力学过程影响大气运动状况和区域气候的变化。末次冰期大尺度强迫引起的全球大气环流背景的变化是形成冰期和现代区域气候差异的主要原因。

The scenarios and the mechanism of the regional climate change over East Asia in the last ice age, which are affected by the large scale circulation background and local mesoscale forcings, are discussed by dynamic analysis and numerical simulations u sin g a regioal climate model and a general circulation model (GCM). The comparison between the simulated and the “observed” shows that results simulated by regional model indicate more details and are closer to the evidences of geological data than that simulated by GCM. The effects of the large scale forcing on the regional climate changes are mainly through the propagation of the stationary wave trains and the teleconnection, while the mesoscale forcing in the domain, mainly through the local thermal and dynamic processes of inside atmophere. In the climate system, changes of one of the independent factors may touch off a positive or negative feedback process and influence the varied degrees of other climate variables.