摘要
基于全球海洋数值模式 ,估计了海水质量非潮汐变化对低阶地球引力场季节性变化的贡献。激发模型预测的大气、地表水、海洋潮汐和非潮汐变化对引力场的组合影响被用来与卫星激光测距 (SLR)的观测值进行比较。结果表明 ,在季节性变化时间尺度上 ,为克服海洋数值模式的体积守恒近似而采用的质量守恒改正对ΔJ2 具有较明显的影响 ,对ΔJ3 的影响可以忽略 ,SLR观测的ΔJ2 周年和半年振幅介于海洋、地表水、大气 (IB)和 (NIB)
Based on the global numerical ocean models, the contributions of nontidal oceanic mass change to the seasonal variations in the low-degree Earth's gravitational field are estimated. The combined effects of the atmosphere, surface water and ocean on the gravitational field predicted by the models are used to compare the values determined by satellite laser ranging (SLR) observations. The results show that the effect of mass conservation correction due to volume conservation approximation used in the numerical ocean models on ΔJ 2 is obvious on the seasonal timescales, but negligible for ΔJ 3. The annual and semiannual amplitudes of the SLR-determined ΔJ 2 are in between the combined values of ocean, surface water and atmosphere with (IB) and (NIB).
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2003年第6期663-667,共5页
Geomatics and Information Science of Wuhan University
基金
中国科学院知识创新工程重点资助项目 (KZCX2 10 6
KJCX2 SW T1 4
KZCX3 SW 13 2 )
关键词
海洋数值模式
质量变化
重力场
卫星激光测距
numerical ocean model
mass change
gravitational field
satellite laser ranging
