地球轨道根数变化与第四纪冰期  

Changes of the Earth's Orbital Elements and the Quaternary Glacial Epoch

作　　者：杨志根[1] 

机构地区：[1]中国科学院上海天文台

出　　处：《天文学进展》2001年第4期445-456,共12页Progress In Astronomy

基　　金：国家攀登项目(970231003)资助课题;上海市科技发展基金项目(JC14012)的资助课题

摘　　要：介绍了米兰柯维奇（Ｍｉｌａｎｋｏｖｉｔｃｈ）天文气候学理论和第四纪地质时期以来冰期的研究展。研究结果表明，地球上的冰体积具有近１０万ｙｒ的变化周期，并伴有近４万ｙｒ和２万ｙｒ的变化周期，它们是由于地球的轨道根数变化导致的气候变迁所致；不同的地球物理资料中均存在上述类似的变化周期，表明气候变迁所导致的变化是全球性效应，证实米兰柯维奇天文理论是基本正确的；对天文气候学理论作了简要介绍，指出了米兰柯维奇天文气候学理论的可能不足，对引起最近百万ｙｒ以来的近１０万ｙｒ气候变化周期的可能天文机制也作了介绍。The recent progress on studies of the Quaternary glacial-interglacial epoch which relates to the Milankovitch astronomical theory of paleoclimate is presented. The different large glacial-interglacial changes with cycles of 100 -120,≈ 40 and 20 thousands years are found in the data of global ice volume, which is implied by the data of oxygen isotope ratio in the deep sea. The similar period terms above in glacial-interglacial climate changes are also documented by complementary climate records derived from different data of geology, such as the deep sea sediments, the records of polar ice core's δ18O from Vostok and the central Greenland, the magnetic susceptibility data of loess profile in China and so on. According to the Milankovitch astronomical theory of paleoclimate, the variations in the geometry of the Earth's orbital elements are the fundamental source of the succession of Quaternary ice age. Hence, it is the global effects that caused by the climatic variations. Milankovitch astronomical theory of paleoclimate is basically reliable. However, the deficiency in this theory and the possible external mechanism of the glacial-interglacial changes with cycles of 100 120 thousands years are introduced and discussed.

关 键 词：Milankovitch天文气候学理论 第四纪冰期 气候变迁 地球轨道根数 

分 类 号：P183[天文地球—天文学]