摘要
本文根据勒夫数和负荷勒夫数的数值扰动原理，利用Ｃｈａｎｄｌｅｒ摆动的理论周期作为滞弹吸收带模型参数估计的约束条件，讨论了地幔滞弹性对有效勒夫数ｋ的直接影响，以及滞弹地球对平衡海潮的响应所产生的间接扰动，分析了它们对带谐潮尺度因子ｋ／Ｃ的影响，由此定义了一个具有动力学海潮、滞弹地幔和液核地球的世界时ＵＴ１潮汐变化序列。与天文新技术观测结果相比较表明，高频带谐潮变化的理论值与实测值是一致的。频散效应对低频项的影响比较明显，但目前的观测资料还难以对它们进行可靠的检测。
According to the numerical perturbation principle of the Love numbers and loading Love numbers,the direct effect of mantle anelasticity on the effective Love number k and the indirect perturbation due to the response of the anelastic Earth to the equilibrium ocean tide are discussed by using the theoretical period of the Chandler wobble as the constraint to estimate the parameter of the absorption band model.Their effects on the scaling factor k/C of the zonal tides are also analysed.From this,the series of the tidal variations in universal time UT1 is defined for an Earth which has a dynamical ocean tide, an anelastic mantle and a fluid core.The comparison of the theoretical values of the zonal tides with the observed results of the new astronomical techniques indicates that the agreement is good at high frequencies. The effect of dispersion on the low-frequency terms is remarkable, but the present observational data are difficult to detect it reliably.
出处
《天文学报》
CSCD
北大核心
1994年第4期406-414,共9页
Acta Astronomica Sinica
关键词
地球自转
潮汐
地幔滞弹性
Earth rotation
Tides
Mantle anelasticity
