地球自转速率年代际周期分量的时变特性  

Time-variation of inter-decade periodic components of the Earth's rotation rate

作　　者：韩延本[1] 马利华[1] 赵海燕[2] 赵娟[2] 

机构地区：[1]中国科学院国家天文台,北京100012 [2]北京师范大学天文系,北京100875

出　　处：《自然灾害学报》2003年第4期29-33,共5页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目(19973011)

摘　　要：利用日长的年均值序列计算了1800～2002年间地球自转速率的年代际周期分量的参数,用小波变换方法分析了主要的年代际周期分量随时间的变化,发现它们均具有时变的特征。文章认为,在研究地球自转与地球物理现象和自然灾害现象的关系时,应特别注意地球自转变化的周期分量的时变性。Based on the yearly average data of the length of the day, the parameters of interdecade periodic components of the Earth's rotation rate during 1800～2002 were calculated, and the variations of the main periodic components with the lapse of time were analyzed by the wavelet transform. It is found that the periodic components possess the character of variation with time. The authors think that more attention should be paid to the character when the relationship between some geophysical phenomena, natural disasters and the Earth's rotation variation are studied.

关 键 词：地球自转 时变特性 小波分析 地球物理现象 自然灾害现象 周期分量 

分 类 号：P183.31[天文地球—天文学]