大气、陆地水储量和海水质量分布变化与地球低阶引力场球谐系数的关系

Changes of Atmosphere,Continental Water and Oceanic Mass Distribution in Relation with Low Degree Harmonic Coefficients in the Earth's Gravitational Field

大气、固体地球及海洋组成了一个复杂、变化的地球动力学系统,这一系统中的任一质量分布变化都将产生地球引力场变化.采用全球7000多个地面气象台站的月平均降水及温度资料、NCEP提供气压月均值、TOPEX/Poseidon卫星测高资料和WOA98海水温度及盐度模型计算了大气、陆地水储量和海水质量分布变化引起地球低阶引力场系数变化.比较综合大气、陆地水储量和海水质量分布变化对带谐项J2,J3,J4影响的计算结果和人卫激光卫星的测定结果,可以看出,大气、陆地水储量和海水质量分布变化是引起地球低阶引力场系数周年变化的重要激发源.

Mass transport of the atmosphere, ocean and the solid Earth results in the temporal variation in Earth's gravitational field. Using monthly mean precipitation and temperature data about over 7000 land meteorological stations, monthly mean atmospheric pressure data provided by NCEP, TOPEX/Poseidon Satellite Altimeter data and WOA98 oceanic temperature and salinity model, changes of low-degree harmonic coefficient in the Earth's gravitational field are predicted . Comparing the predicted results about J2,J3,J4caused by atmosphere, continental water storage and oceanic mass movement with the observed results from SLR satellites, the results show that annual variation of low-degree harmonic coefficient in Earth's gravitational field is mostly excited by the changes of atmosphere, continental water storage and oceanic mass distribution.