The theory of precipitable water vapor(PWV)inversion based on GPS is introduced.Afterwards the PWV is obtained by using GAMIT software to calculate the IGS station data.Then the changes of visibility in different stages of the formation and dissipation of fog in January in Wuhan city are researched by analyzing PWV hourly.Through analyzing the change of PWV in the process of fog, the stage of fog is determined.At the same time, the data of PWV in foggy, sunny and rainy days in January are compared.The characteristics of humidity, temperature and dew point in rainy and foggy days are analyzed.The research results show that the formation of fog in Wuhan city is the result of combined effects of various factors.%介绍了地基GPS大气可降水量(precipitable water vapor,PWV)反演原理.利用GAMIT软件解算IGS站数据得到PWV,用逐时分析PWV的方法研究了武汉市一月份大雾生成和消散各个阶段能见度的变化.通过分析大雾过程中PWV的变化,确定大雾所处的阶段;同时对比了一月份雾天和晴天、雨天的PWV数据,分析了雨天和雾天的湿度、温度、露点的变化特点.研究结果表明武汉地区大雾的形成是多种因素综合作用的结果.
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