天球有效大气角动量中的周年和半年项估计

The Annual and Semi annual Signal in the Celestial Effective Atmospheric Angular Momentum

为了讨论大气对非刚体地球章动周年和半年项的贡献 ,本文将大气有效角动量(1980 .0～ 1998.33)从地面参考系转换至空间参考系得到大气的天球有效角动量 CEAM,低通滤波后用最小二乘方法拟合得到顺。

The atmospheric effective angular momentum,from 1980.0 to 1998.33,is transferred from terrestrial reference frame to celestial reference frame,and the Celestial Effective Angular Momentum (CEAM) is obtained.After CEAM is filtered by low-frequency-pass filter,the amplitudes of the pro-annual,retro-annual and pro-semi-annual terms are solved from the CEAM by least-square-fit.Which will be used to discuss the atmospheric contribution to the annual and semi-annual nutation of non-rigid Earth in the continuing paper.