CAJ | 학술논문

由温度、气压和水汽压决定的大气折射率会影响天气雷达电磁波的传播路径和目标回波的相位。因此,通过测量目标回波相位的变化能够算出大气折射率的变化,进而得到水汽信息,为研究局地对流天气和水汽平流提供资料。本文阐述了多普勒天气雷达反演大气折射率的原理和方法,并利用江苏省气象台的S波段多普勒天气雷达反演了一次雷暴过程前后的大气折射率,表明了雷达探测大气折射率的可靠性。这项工作有望为研究水汽变化和天气过程提供高分辨率的遥感资料,也可以为数值模式提供水汽场辅助数据,有良好的应用前景。
유온도、기압화수기압결정적대기절사솔회영향천기뢰체전자파적전파로경화목표회파적상위。인차,통과측량목표회파상위적변화능구산출대기절사솔적변화,진이득도수기신식,위연구국지대류천기화수기평류제공자료。본문천술료다보륵천기뢰체반연대기절사솔적원리화방법,병이용강소성기상태적S파단다보륵천기뢰체반연료일차뇌폭과정전후적대기절사솔,표명료뢰체탐측대기절사솔적가고성。저항공작유망위연구수기변화화천기과정제공고분변솔적요감자료,야가이위수치모식제공수기장보조수거,유량호적응용전경。
Dominated by atmospheric temperature,pressure and water vapor pressure,the atmospheric refractivity affects both the propagation path of radar EM-waves and the echo phase of an object.This implies that the variation of atmospheric refractivity can be retrieved by calculating changes of echo phase measured by Doppler weather radar.Thus the relevant water vapor information can be obtained for the research of local convection or advection.This paper explains the principle and method of refractivity retrieved from Doppler weather radar.The experiment results showed that the atmospheric refractivity retrieved from the S-band Doppler radar of Jiangsu Meteorological Observatory was reliable and effective in the case of a local thunder storm.The work can supply not only the remote-sensed data to the study on changes of water vapor and weather changes but also supporting data of water vapor field to numerical models,which is very promising in application.