大气负荷引起的重力与位移变化理论计算的精度估计  

Theoretical Computation in the Precision Estimation of the Change in Gravity and Displacements due to Atmospheric Loading

作　　者：罗少聪[1] 孙和平 徐建桥[1] 

机构地区：[1]中国科学院测量与地球物理研究所,湖北武汉430077

出　　处：《测绘学报》2001年第4期309-315,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金资助项目 ( 4 992 5 411);科学院重点基金资助项目 ( KZCX2 -10 6 )

摘　　要：讨论了实测大气观测资料计算气压变化引起的重力和位移效应的精度问题。基于区域分布的实测资料和格林函数褶积计算方法 ,讨论了数据网格划分、气压平均估值、空缺数据插值和不同地球模型对重力和位移负荷效应理论计算精度的影响。结果说明 ,在气压采样时刻 ,大气变化对重力、垂直和水平位移的计算精度分别为± 0 .1 95μGal( 1 Gal=1 cm/ s2 )、± 0 .0 43 cm和± 0 .0 1 2 cm,对提高重力、GPS、SL R和 VLBI观测结果精度大有裨益。但在非大气观测采样时刻 ,特别是寒潮和气压旋变化激烈时刻 ,内插数据精度没有保证 。The problem of the precision estimation for gravity and displacements, due to the change in barometric pressure calculated using observations and Green's function method are discussed in this study. Precision evaluation, related to the size of grid for integration, the errors of average pressure, data errors induced by the interpolation and the different real Earth's models, is obtained respectively. The results show that the total errors caused by the uncertainties of the Earth's models and air pressure observations, are ±0.195 μGal for gravity, ±0.043 cm for radial displacement and ±0.012 cm for horizontal displacements, which can satisfy the precision of correction to the observations by various presented instruments, such as gravity, GPS,SLR and VLBI observation. The errors, caused by the interpolated air pressure data unsampled, are very large, especially, when a cold front or a cyclone pass through.

关 键 词：大气影响 格林函数 精度估计误差 重力变化 位移变化 寒潮 

分 类 号：P223[天文地球—大地测量学与测量工程]