摘要
本文利用地球自转速率变化和大气角动量的观测资料,分析了周期为40—90天的高频振荡,给出了它们随时间变化的特性,以及大气角动量变化随纬度分布的空间结构.结果表明:对大气角动量高频变化的贡献主要来自南、北半球中低纬度区域,日长和大气角动量的高频变化表现为多峰特性,而且它们的振幅和周期都是不固定的.
Using the observational data of the Earth's rotation rate and atmospheric angular momentum, the high-frequency oscillations with periods between 40 and 90 days are analysed, and their behaviour of variations with time as well as the spatial pattern of fluctuations in atmospheric angular momentum versus latitude are exhibited. The results show that the contributions to the high-frequency oscillations in atmospheric angular momentum mainly come from the regions of medial-low latitude in the northern and southern hemispheres, that the high-frequency oscillations in length-of-day and atmospheric angular momentum display a multi-peak phenomenon, and that their amplitudes and periods are unstable.
出处
《天文学报》
CSCD
北大核心
1990年第3期221-227,共7页
Acta Astronomica Sinica
关键词
日长
大气角动量
高频
振荡
Length of day—Atmospheric angular momentum—50 days oscillation
