核幔边界动力学——地球自转十年尺度波动  

DYNAMICS OF THE CORE-MANTLE BOUNDARY AND THE DECADAL FLUCTUATION IN THE EARTH’S ROTATION

作　　者：傅容珊[1,2] 李力刚 郑大伟[3] 薛霆啸[1,2] 

机构地区：[1]中国科学技术大学地球和空间科学系 [2]第三世界科学院中国科学技术大学地球科学和天文学高级研究中心,安徽合肥230026 [3]中国科学院上海天文台

出　　处：《地球科学进展》1999年第6期541-548,共8页Advances in Earth Science

基　　金：国家攀登计划资助 !(编号:97023103)

摘　　要：总结了地球核幔边界动力学有关研究的新进展，如核幔边界的特性、核幔边界的地形起伏、核幔边界附近地幔对流格局和地球外核顶部的流场等。从地核—地幔之间的耦合出发，讨论了地球自转十年尺度的波动问题，简述了核幔之间电磁耦合、粘滞耦合和地形耦合对十年尺度波动影响的基本理论。提出在该项研究中应以综合分析为基础，开展多学科的联合、交叉研究的途径以深化对地球自转十年尺度波动机理的认识。The new advances in the researches on the core mantle boundary (CMB) dynamics are summarized in this paper. They are the studies of the structure and characteristics of the CMB, the topography of the CMB, the patterns of the mantle convection near the CMB and the core flow at the top of the outer core. On the basis of the coupling between the core and mantle, the decadal fluctuation in the Earth's rotation is discussed. We also introduce the basic theory of the electromagnetic coupling, the viscous coupling and the topography coupling at the core mantle interface and their influences to the decadal fluctuation in the Earth's rotation. At the end of this paper authors emphasize that in order to understand the nature of the decadal fluctuation in the Earth's rotation the best way is to develop a coordinate model, which will joint different scientific areas such as the astronomy, geophysics, geodynamics, space geodecy and so on.

关 键 词：核幔边界 地球自转变化 十年尺度波动 动力学 

分 类 号：P183.31[天文地球—天文学]