基于快速傅立叶变换的短时水汽变化周期研究  

Study on Short-term Precipitable Water Vapor Periodic Change based on Fast Fourier Transform

作　　者：刘严萍 LIU Yanping(School of Economics and Management,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]天津城建大学经济与管理学院

出　　处：《灾害学》2020年第1期60-63,83,共5页Journal of Catastrophology

基　　金：天津市自然科学基金(17JCYBJC21600)

摘　　要：水汽对于强降水过程形成、PM微颗粒生成及雾霾形成至关重要,水汽的短时周期变化可为暴雨预警、雾霾形成机理分析提供参考。该文采用快速傅立叶变换方法开展短时水汽变化周期研究。开展无线电探空水汽的快速傅立叶变换,分析无线电探空水汽周期;利用快速傅立叶变换方法开展GNSS水汽短时变化周期分析,并开展与温度、相对湿度、气压的变化周期比较分析。研究发现:水汽存在日周期、半日周期以及3 h(接近3 h)的周期变化。相对于温度、相对湿度和气压来说,水汽除了存在相同的日周期、半日周期外,还存在更短时间的周期变化,说明水汽对于太阳辐射更为敏感。Precipitable water vapor(PWV) is very important for the formation of heavy precipitation, PM particles and haze. The short-term periodic change of PWV can provide reference for rainstorm warning and haze formation mechanism analysis. In this paper, fast Fourier transform(FFT) is used to study the short-term PWV periodic change. The FFT method was used to analyze the period of radiosonde PWV. The GNSS short-time change period analysis was carried out by using the FFT method, and compared with the change period of temperature, relative humidity and air pressure. It is found that PWV has daily, semi-daily and 3-hour(nearly 3-hour) cycles. Compared with temperature, relative humidity and air pressure, PWV not only has the same diurnal period and semi-diurnal period, but also has shorter period changes, indicating that PWV is more sensitive to solar radiation.

关 键 词：水汽 GNSS 无线电探空 快速傅立叶变换 

分 类 号：P642[天文地球—工程地质学] X43[天文地球—地质矿产勘探]