水汽对大气重力和倾斜格林函数的影响  

INFLUENCES OF WATER VAPOR ON ATMOSPHERIC GRAVITY AND TILT GREEN’S FUNCTION

作　　者：罗少聪[1] 徐建桥[1] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学重点实验室,武汉430077

出　　处：《大地测量与地球动力学》2004年第4期39-42,共4页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金 (4 0 1740 2 2 );中国科学院二期知识创新项目 (KZCX3 -SW -13 1)

摘　　要：建立用相对湿度表示的大气比气体常数模型 ,利用地面温度和空间垂直温度梯度与压力变化的规律估算大气水汽组分变化对比气体常数的影响。结果表明 :在自然温度条件下 ,水汽变化对大气比气体常数影响不大。进一步将此结果应用于大气重力和倾斜格林函数 ,得到了水汽对大气重力和倾斜格林函数的影响估计。A model of the gas constant per gram for moisture air was developed and expressed with relative humidity in this paper, and then the effects of vapor on the parameter in the space near the Earth’s surface are estimated by use of the existent model of standard atmosphere for the vertical gradient of temperature under the condition of saturated vapor pressure, as well as the data of the ground-based pressure and temperature. The numerical results show that the parameter slightly changes with the vapor variations in the air. According to expresses of the atmospheric gravity and tilt Green’s function, vapor will lead to only little changes of these Green functions.As a result, numerical calculation of the attractive term in the Green’s functions can be significantly simplified.

关 键 词：水汽 大气 重力 地面温度 格林函数 倾斜 相对湿度 表示 模型 估计 

分 类 号：P426[天文地球—大气科学及气象学] P458.121.1