利用GRACE和地球物理模型研究地球动力学扁率变化  

Using GRACE Data and Geophysical Models to Analyse Earth's Dynamic Oblateness Changes

作　　者：陈品馨 CHEN Pinxin(Surveying and Mapping Press, Beijing 100045, China)

机构地区：[1]测绘出版社,北京100045

出　　处：《测绘通报》2018年第4期100-103,共4页Bulletin of Surveying and Mapping

摘　　要：作为一个旋转的扁椭球体,地球的动力学扁率J2变化主要是由各圈层相互作用和地球系统的物质流动所引起。当前,测定地球动力学扁率主要是通过卫星激光测距资料获得。本文利用GRACE月重力场模型、海底气压模型和冰期均衡调整模型等估计地球动力学扁率月变化ΔJ2,通过计算得到的C20时间序列与卫星激光测距(SLR)结果差别不大。通过计算分析,可以看出使用不同机构发布的GRACE数据产品,得到的季节变化时间序列的结果差别不大,与SLR结果非常接近,得出的C20时间序列在SLR方差百分比达70%。As a rotating ellipsoid,the dynamic oblateness（ J2） changes of the earth is significantly influenced by the interaction of different layers in the earth system and the redistribution of earth＇s fluid mass.At present,the dynamic oblateness is usually obtained from the satellite laser ranging（ SLR） data. A new method is proposed to estimate changes in the earth＇s dynamic oblateness,which uses monthly gravity recovery and climate experiment（ GRACE） gravity solutions,an ocean bottom pressure model and a glacial isostatic adjustment（ GIA） model.The result shows that the time series is similar with the solution based on SLR data.The experiment shows that seasonal variations of the obtained time series are similar with different GRACE data products,which is approximate with the solution based on SLR.

关 键 词：地球动力学扁率 卫星激光测距 GRACE 重力场 时间序列变化 

分 类 号：P223[天文地球—大地测量学与测量工程]