【摘 要】
：
传统形状理论在研究地球内部结构与形状时一般采用流体静平衡态假设并结合一维地球模型进行计算,其所得的地球内部等势面形状具有对称性,但已知的地球内部物质分布极其复杂,是不能简单地作为一个对称体讨论的.本文根据前人所提出的一般形状理论,全面考虑了地壳地形存在及其影响,所求得的等势面形状更为真实地反映了地球内部物质分布状况,并将地球从壳幔边界处分成内外两部分求解了各自的地球转动惯量.研究表明地壳质量虽然不
【机 构】
：
中国科学院上海天文台,上海200030;中国科学院大学,北京100049 中国科学院上海天文台,上
【出 处】
：
2014年大地测量研究进展学术研讨会
论文部分内容阅读
传统形状理论在研究地球内部结构与形状时一般采用流体静平衡态假设并结合一维地球模型进行计算,其所得的地球内部等势面形状具有对称性,但已知的地球内部物质分布极其复杂,是不能简单地作为一个对称体讨论的.本文根据前人所提出的一般形状理论,全面考虑了地壳地形存在及其影响,所求得的等势面形状更为真实地反映了地球内部物质分布状况,并将地球从壳幔边界处分成内外两部分求解了各自的地球转动惯量.研究表明地壳质量虽然不到整个地球的0.49％,但它却占地球转动惯量的3.68％,目前使用不同积分方法求得地壳部分转动惯量的差值为10-5量级,在一般形状理论研究中此精度不可忽略,需要提出更高精度的方法进行解算.此外,研究表明加入地壳层信息所求得的地球内部形状更符合实际,并可使所求动力学扁率H值与天文岁差观测值更符合.
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