大气负荷对新疆地区地壳形变和地面重力变化的影响

Research on the Effect of Atmospheric Pressure Load on Crust Deformation and Gravity Change in Xinjiang Region

基于ECMWF全球大气模型和中国地面气候资料日值数据集中新疆及周边的气象站气压数据,根据弹性地壳形变理论,采用移去-恢复法,利用负荷格林函数法和球谐函数法,计算新疆及周边区域2011～2015年大气负荷变化对地壳垂直、水平形变的影响,同时采用大气导纳方法计算大气变化对地面重力的影响。结果表明,大气负荷对新疆地区垂直形变的影响达到cm级,对地面重力的影响可达10μGal;大气负荷影响具有明显的季节性。

Based on the ECMWF global atmospheric model and the daily data of the surface climatological data in China,the pressure data of the meteorological stations in Xinjiang and surrounding areas are concentrated.According to the theory of elastic crustal deformation,the method of removal and recovery is adopted,and Green’s function and the spherical harmonic function method are used to study and calculate its effect on atmospheric load on the vertical and horizontal deformation of the crust,during the period from 2011 to 2015 in Xinjiang and the surrounding area.At the same time,the atmospheric admittance method is used to calculate the influence of atmospheric variance on ground gravity.The results indicate:1)the influence of atmospheric load on vertical deformation in Xinjiang reaches the centimeter level,and the influence on ground gravity can reach 10 μGal;2)the influence of atmospheric load has significant seasonality.