利用超快速星历进行数值天气预报的可行性研究

摘要

Obtaining real-time atmospheric water vapor of high temporal and spatial resolution is the key to improve the accuracy of numberical weather forecast .Based on the principle of GPS remote sensing precipitable water vapor (PWV) ,the data of certain stations in Hong Kong CORS is processed .The PWV time series calculated with ultra-rapid ephemeris ,precise ephemeris and radiosonde observation data respectively are compared and analyzed .The results show that it is feasible to use the PWV calculated with ultra-rapid ephemeris for numberical weather forecast .%实时获取高时空分辨率的大气水汽是制约数值天气预报准确性的关键问题。基于地基GPS遥感大气水汽原理，结合香港CORS网的实测数据进行处理，对由IGU超快速星历、IGS精密星历和探空资料解算的大气可降水量（Precipitable Water Vapor ，PWV）序列进行比较分析。实验结果表明，利用超快速星历估计 PWV用于数值天气预报是切实可行的。