Consistent estimates of the dynamic figure parameters of the earth

被引:0
|
作者
Wei Chen
Jian Cheng Li
Jim Ray
Wen Bin Shen
Cheng Li Huang
机构
[1] Wuhan University,Key Laboratory of Geospace Environment and Geodesy, School of Geodesy and Geomatics
[2] National Oceanic and Atmospheric Administration (retired),Key Laboratory of Planetary Sciences, Shanghai Astronomical Observatory
[3] Chinese Academy of Science,undefined
来源
Journal of Geodesy | 2015年 / 89卷
关键词
Earth’s mass; Principal moments of inertia; Dynamic ellipticity;
D O I
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中图分类号
学科分类号
摘要
The Earth’s dynamic figure parameters, namely the principal moments of inertia and dynamic ellipticities of the whole Earth, the fluid outer core and the solid inner core, are fundamental parameters for geodetic, geophysical and astronomical studies. This study aims to re-estimate the mass and the dynamic figure parameters of the Earth on the basis of some global gravity models (EGM2008, EIGEN-6C and EIGEN-6C2) recently released with unprecedented accuracies, as well as an improved value of the gravitational constant G\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$G$$\end{document} recommended by the Committee on Data for Science and Technology (CODATA). With the potential coefficients of EGM2008, EIGEN-6C and EIGEN-6C2 rescaled to be consistent with the IAU (International Astronomical Union) and IAG (International Association of Geodesy) numerical standards, and other values of relevant parameters also being consistent with those numerical standards, we have obtained consistent estimates of the dynamic figure parameters of the stratified Earth using the theory described in Chen and Shen (J Geophys Res 115:B12419 2010). Our preferred principal moments of inertia for the whole Earth are A=(80,085.1±9.6)×1033kgm2,B=(80,086.8±9.6)×1033kgm2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$A = (80{,}085.1\pm 9.6)\times 10^{33}~\hbox {kg}~\hbox {m}^{2}, B = (80{,}086.8\pm 9.6) \times 10^{33}~ \hbox {kg} ~\hbox {m}^{2}$$\end{document}, and C=(80,349.0±9.6)×1033kgm2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$C = (80{,}349.0 \pm 9.6) \times 10^{33}~\hbox {kg} ~\hbox {m}^{2}$$\end{document}, respectively, the accuracies being limited by the uncertainties of G\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$G$$\end{document} and e\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$e$$\end{document} (dynamic ellipticity of the whole Earth).
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页码:179 / 188
页数:9
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