月球平均运动和地球自转速率长期变化的潮汐耗散  

Secular Changes in the Moon's Mean Motion and Earth Rotation Rate Due to Tidal Dissipation

作　　者：朱耀仲[1] 吴斌[1] 彭碧波[1] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学开放实验室,湖北武汉430077

出　　处：《测绘学报》2000年第z1期1-4,共4页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金资助项目 !( 49774 2 2 9) ;国家攀登计划资助项目! ( 970 2 310 0 3)

摘　　要：利用 198 3～ 1994年 (共 11年 )期间 ,全球人卫激光测距 (SLR)观测网对 L ageos-1卫星的观测资料 ,估算二阶重力场系数和潮汐参数。SLR和卫星测高的潮汐解被用来计算月球轨道根数相对黄道坐标系的长期变化和地球自转速率的长期变化。SLR确定的总的潮汐耗散引起的月球平均运动的长期变化为 -2 4.78″/世纪 2 ,与激光测月结果 ((-2 4.9± 1.0 )″/世纪 2 )非常一致。日月潮汐引起的地球自转速率的长期变化为 -5 .2 5× 10 -2 2 rad/ s2 ,顾及地球扁率变化 (J2 )的非潮汐效应 ,对应的日长变化为 1.49ms/世纪 ,与 16 2 0年以来的天文月掩星结果 (1.4ms/世纪 )十分相符。本文还联合卫星测高和人卫激光测距确定的潮汐解 ,在月球平均运动和地球自转速率的长期变化中 。Using 11 years (1983～1994) observation data of Satellite Laser Ranging (SLR) to the Lageos-1 satellite in the global tracking network，we estimate the second degree gravity field coefficient and tidal parameters.The tidal solutions obtained from SLR and satellite altimetry are used to compute the secular changes in the Moon's orbit elements and the Earth rotation rate in the ecliptic reference system.The SLR-derived secular change in the Moon's mean motion caused by the total tidal dissipation is -24.78 arc sec/century2，agreeing very well with the result ((-24.9±1.0) arc sec/century2) from the analysis of the lunar laser ranging data.The secular change in the Earth rotation rate caused by the solar and lunar tides is -5.25×10-22 rad/s2.Taking into account the non-tidal effect of the changes in the Earth rotation rate,the corresponding change in length of day is 1.49 ms/century.This value is consistent with recent astronomical result (1.4 ms/century) of eclipse records since 1620.We also combine the tidal solutions determined by altimetry and SLR to distinguish the dissipation effects of the solid Earth and oceans on the secular variations of the Moon's mean motion and Earth rotation rate.

关 键 词：月球平均运动 地球自转 潮汐耗散 

分 类 号：P2[天文地球—测绘科学与技术]