不同频段上极移,日长变化与大气角动量变化激发结果的比较

本文用ＪＭＡ大气角动量序列计算了对极移和日长变化的激发量（ｍ＇１、ｍ＇２和ｍ＇３），并分三个频段与天文观测得到的地球自转参数序列（ｍ１、ｍ２和ｍ３）进行了比较．结果表明：在钱德勒和季节性频段上，大气运动确实是固体地球自转变化的主要激发源．

COMPARISON BETWEEN THE VARIATION OF EOP AND THE ATMOSPHERIC EXCITATION AT DIFFERENT FREQUENCY DOMAINS

Using the data series of atmospheric angular momentum (AAM) function (1982.09-1992.09) provided by the Japan Meteorological Agency (JMA) the atmospheric excitation(m'1, m'2, m'3)in polar motion and length of day were computed in this paper. The comparison between the earth rotation parameters (m1, m2, m3),which were derived by the JPL and called as Space'92 series, and the atmospheric excitation (m'1, m', m'3) were made at different frequency domains.It is shown that the agreements between m1, m2, m3 and m'1, m'2,m'3 at Chandler and seasonal frequency domain are very well. The correlation coefficients between them are high up to 0.98. The agreements of those are worse at inter annual frequency domain and high frequency domain below one month.It is also shown by the correlation delay that the law of causation between AAM excitation and the components of the polar motion is not clear.