中国全新世气候变迁相位差与亚洲季风及西风带的联系

不同区域由于其主导气候影响因素的差异而表现出不同的全新世气候变化特征,对这些机制的研究,可以很好地理解各种自然要素的发展变化过程、气候影响机制及相互耦合关系。通过中国不同区域全新世气候变化研究成果的对比分析,发现黄土高原区与西北干旱区全新世期间气候特征主要表现为干冷的早全新世、暖湿的中全新世、气候恶化的晚全新世,而西南季风区与东部季风区全新世期间表现出两次季风加强阶段,但西南季风要比东南季风加强提前约3～4ka。该文认为黄土高原区与西北干旱区可能受同一气候系统制约,从而表现出类似的气候变化特征。西南季风区与东部季风区全新世气候变化特征有很好的对比性,可能是由于亚洲西南季风与东南季风在全新世的推进与退缩共同受到行星风带南北移动的影响,使其气候表现出类似的变化特征,但由于海洋巨大的热容导致东南季风的加强延后,从而导致西南季风区与东南季风区全新世的气候变化具有不同步性。

The Asynchronous Nature of Holocene Climate Variability in China and Its Linkage to Asian Monsoon and the Westerly

Different regions controlled by different dominant climatic factors show different characteristics of Holocene climate change.By the study of these mechanisms,we can have a very clear understanding on the developing process and the mutual coupling relation between the natural elements,as well as the impact of mechanism on climate.Through comparative analysis of Holocene climate changes in different regions of China,it is found out that the characteristics of Holocene climate changes in Northwest China and the Loess Plateau generally show that there are a dry and cold climate in the early Holocene,a warm and humid climate in mid-Holocene,a climate deterioration in the late Holocene,and two monsoon strengthening appearing in the southwest monsoon region and the eastern monsoon region during the Holocene.But the strengthening of the southwest monsoon is about 3～4 ka earlier than that of southeast monsoon.This paper argues that the characteristics of Holocene climate changes on the Loess Plateau and Northwest China are alike which may be due to the same climate system that affects them.While,the contrast of Holocene climate changes in Southwest Monsoon region and Eastern Monsoon region is pretty good which may indicate that both the strengthening and weakening of Southwest Monsoon and Southeast Monsoon are controlled the same by the north-south movement of planetary wind belt during Holocene.But the strengthening of the southeast monsoon delayed because of the huge heat capacity of ocean,resulting in the asynchrony of Holocene climate changes in Southeast Monsoon region and Southwest Monsoon region.