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《Chinese Journal of Geophysics》 2005-06
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Theoretical computation of the barometric pressure effects on deformation,gravity and tilt

LUO Shao-Cong,SUN He-Ping,XU Jian-Qiao Key Laboratory of the Dynamic Geodesy,Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China  
Based on the loading theory of an elastic earth,and the distributions of dry air and its vertical gradients of temperature under hydrostatic equilibrium,we have theoretically modeled the effects of barometric pressure on the observations of deformation,gravity and tilt.The influences of many factors,such as the adopted earth models,station height,topography around station,surface temperature and water vapor in atmosphere,on the final results are taken into account and discussed in detail.The numerical results show that the elastic effects mainly come from the atmosphere in the area far away from the station.The direct effects on gravity come from the contribution of the air in the area near the station,while those on tilt from the contribution of the air in the area far away from the station.The influences of all these factors on the atmospheric gravity and tilt Green's functions mainly occur in the range of the angular distance less than 0.1 and 1 degrees,respectively,but their comprehensive influence is extremely complicated.
【Fund】: 中国科学院知识创新工程重要方向性项目(KZCX3_SW_131);; 百人计划项目资助;; 国家自然科学基金项目(40374029)资助
【CateGory Index】: P223
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