Contributions of thermoelastic deformation to seasonal variations in GPS station position
Contributions of thermoelastic deformation to seasonal variations in GPS station position
复制标题
热弹性变形对 GPS 站位置季节变化的贡献
DOI：
10.1007/s10291-017-0609-6
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发表时间：
2017-07
期刊：
影响因子：
4.9
通讯作者：
Zhou Feng
中科院分区：
文献类型：
--
作者：
Xu Xueqing;Dong Danan;Fang Ming;Zhou Yonghong;Wei Na;Zhou Feng
我们研究了由于2014年全球热弹性模型的陆地温度变化引起的表面位移，该模型是在地心保持静止的约束下在均匀弹性球体上的解决方案。本文利用美国国家海洋和大气管理局提供的0-10 cm地表温度资料，对全球地表位移的季节变化进行了数值模拟。位移首次包括垂直和水平分量。同时，还估算了地球物理源的年贡献，这些地球物理源主要来自大气、海洋、雪和大陆水。为了进行比较分析，分别计算了年质量荷载引起的部分位移和热弹性和质量荷载组合引起的总位移，并与全球定位系统网络站点的年位移进行了对比。数值模拟结果表明，地表热弹性变形在全球尺度上的振幅为毫米量级，径向位移峰值约为3 mm，横向位移峰值约为1.5 mm，这是高精度地球参考系需要考虑的问题。由热弹性和质量载荷引起的组合变形比单独的质量载荷能更好地解释季节性GPS观测，特别是对于横向位移。
We investigate surface displacements due to land temperature variation with the 2014 global thermoelastic model, which is a solution on a uniformly elastic sphere under the constraint that the geocenter remains stationary. In this research, the seasonal variations of global surface displacements are numerically simulated based on 0–10 cm underground land surface temperatures from National Oceanic and Atmospheric Administration. The displacements include vertical and horizontal components for the first time. Meanwhile, the annual contributions of geophysical sources, which are mainly due to atmosphere, ocean, snow and continental water, are also estimated. For comparative analyses, the partial displacement by annual mass-loading and the total displacement by the combined annual of thermoelasticity and mass-loading are calculated, respectively, and displayed against the annual displacements at stations of global positioning system network. Results of the numerical simulation show that the amplitude of surface thermoelastic deformation is at the millimeter level on the global scale, topped at about 3 mm for radial displacement and about 1.5 mm for transverse components, which need to be considered for the high-precision terrestrial reference frame. The combined deformation caused by thermoelastic and mass-loading can explain the seasonal GPS observations better than the mass-loading alone, in particular for the transverse displacements.
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影响因子：
--
作者：
T. Dam;J. Wahr;D. Lavallée
通讯作者：
T. Dam;J. Wahr;D. Lavallée
DOI：
--
发表时间：
2011-12
期刊：
--
影响因子：
--
作者：
X. Collilieux;P. Rebischung;T. Dam;J. Ray;Z. Altamimi
通讯作者：
X. Collilieux;P. Rebischung;T. Dam;J. Ray;Z. Altamimi
影响因子：
--
作者：
V. Tsai
通讯作者：
V. Tsai
影响因子：
3.9
作者：
Dong, D;Fang, P;Miyazaki, S
通讯作者：
Miyazaki, S
质心静止的均匀弹性球体上由于表面温度变化而产生的位移
影响因子：
2.8
作者：
Fang, Ming;Dong, Danan;Hager, Bradford H.
通讯作者：
Hager, Bradford H.