朱耀仲, 闫昊明, 钟敏. 海洋非潮汐变化对时变重力场的影响[J]. 武汉大学学报 ( 信息科学版), 2003, 28(6): 663-667.
引用本文: 朱耀仲, 闫昊明, 钟敏. 海洋非潮汐变化对时变重力场的影响[J]. 武汉大学学报 ( 信息科学版), 2003, 28(6): 663-667.
ZHU Yaozhong, YAN Haoming, ZHONG Min. Nontidal Oceanic Effects on Temporal Variations in the Earth's Gravitational Field[J]. Geomatics and Information Science of Wuhan University, 2003, 28(6): 663-667.
Citation: ZHU Yaozhong, YAN Haoming, ZHONG Min. Nontidal Oceanic Effects on Temporal Variations in the Earth's Gravitational Field[J]. Geomatics and Information Science of Wuhan University, 2003, 28(6): 663-667.

海洋非潮汐变化对时变重力场的影响

Nontidal Oceanic Effects on Temporal Variations in the Earth's Gravitational Field

  • 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)的组合结果之间。

     

    Abstract: 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 ΔJ2 is obvious on the seasonal timescales,but negligible for ΔJ3.The annual and semiannual amplitudes of the SLR-determined ΔJ2 are in between the combined values of ocean,surface water and atmosphere with(IB) and(NIB).

     

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