华北平原大雾天气CINRAD/SA雷达超折射回波与数值模拟分析

Analysis on the Super-refraction Echoes and Numerical Simulation of Dense Fog in North China Plain by the CINRAD/SA Radar Data

利用2004～2007年石家庄CINRAD/SA型多普勒天气雷达资料,对华北平原出现的10次大雾天气过程中的超折射回波特征进行了统计,并利用中尺度模式MM5V3的数值模拟结果结合探空实况对2005年11月19～21日的华北平原大雾天气过程的超折射回波的形成原理进行了分析。结果表明,华北平原大雾天气有利于大气波导的形成;超折射回波具有明显的时空分布特征,太行山对超折射回波分布有明显影响;在0.5°平面位置显示产品上超折射回波主要分布在东部平原,出现在夜间和上午;在大雾天气过程中出现超折射回波表明大雾天气的进一步发展和维持,为华北平原大雾天气的监测、预报提供新的技术手段和科学依据。

Base on the CINRAD/SA Doppler radar data from 2004 to 2007 in Shijiazhuang,the super-refraction echoescharacteristics of 10 times of dense fog weather occurred in North China plain were statistically studied. According to the numerical simulation results of mesoscale model MM5V3 and the sounding date,the form mechanism of the super-refraction echoes of fog occurred in North China Plain during Nov. 19-21,2005 were analyzed. The results indicated that the dense fog weather benefited the occurrence of atmospheric duct ,and the super-refraction radar echoes had obvious temporal and spatial distribution characteristics. Taihang Mountains had obvious affect on the form and distribution of super-refraction radar echoes. The super-refraction radar echoes were mainly in the east plain in the morning or evening in 0.5~ plan position products. The super- refraction radar echoes indicated that the fog would develop or maintain. These supplied new means for the monitor and forecast of dense fog occurred in North China plain.