使用全球定位系统遥感水汽分布原理和中国东部地区加权“平均温度”的回归分析

THE APPROACH TO REMOTE SENSING OF WATER VAPOR BASED ON GPS AND LINEAR REGRESSION Tm IN EASTERN REGION OF CHINA

中文关键词:  全球定位系统  垂直积分水汽  天顶湿延迟  加权“平均温度”

英文关键词:GPS meteorology  Verticalinteg rated water vapor (IWV)  Zenith wet delay  Weighted “mean temperature”

中文摘要:

      文中讨论了利用全球定位系统探测水汽的原理。为了反演出大气垂直积分水汽或可降水,需要计算加权“平均温度”T_m.T_m与对流层温度廓线和水汽垂直分布有关,但从北京气象台1992年探空资料分析表明,它与表面温度存在着很好的线性关系。文中应用中尺度气象模式,给出了适合于中国东部地区和不同季节的关于T_m和表面温度T_s的线性回归方程。

英文摘要:

      The approach to remote sensing of water vapor based on the global positioning systens (GPS) is described. In order to achieve the best possible retrieved of the vertical integ rated water vapor (IWV) or the precipitable water (PW), the weighted mean temperature of the atmosphere, T_m would be estimated to the specific area and season.T_m depends not only on surface temperature, tropspheric temperature profile, and also on the vertical distribution of water vapor. The surface temperature dependence is born out by a comparison of T_m and the values of surface temperature T_s using radiosonde profiles of Beijing observatory (54511) throughout 1992. The analysis of radiosonde profiles spanning an one-year interval (1992) from sites in eastern region of China with a latitude range of 20～50°N and a longitude range of 100～130°E yields the coefficients a and b of a limear regression equation T_m=a+bT_s.