长三角地区多种大气可降水量获取方法研究

Research on the Methods of Obtaining Precipitable Water Vapor in Yangtze River Delta

利用长三角地区多个探空站气象资料、GNSS观测数据和GPT3模型,以探空资料的大气可降水量(PWV)为参考值,评估GPT3模型、两种地面气象资料法和GNSS等4种方法计算的PWV精度、可靠性和时效性。结果表明,GPT3模型可实时获取PWV,但精度较低;GNSS-PWV精度最高,但需要实测气象参数,会限制其应用范围;两种地面气象资料法精度较高,但需要地面露点温度数据。

Based on the GPT3 model,GNSS observation data and meteorological data of multiple radiosonde stations in Yangtze River Delta,we evaluate the precision,reliability and real-time performance of PWV calculated by GPT3 model,2 surface meteorological data methods and GNSS,compared with the radiosonde PWV as the true value.The results show that the GPT3 model can be used to obtain real-time PWV with low precision.GNSS-PWV has the highest precision,but it needs measured meteorological parameters,which limits its widespread application.The 2 surface meteorological data methods have the higher precision,but they need surface dew point temperature data.