摘要
灵敏的多普勒雷达经常能探测到弱窄带回波,这些弱窄带回波一般对应于边界层的辐合线,对弱窄带回波的仔细分析有利于及早做出强对流天气的临近预报以及对其发展变化作深入了解。文章结合发生在上海的3次强对流天气个例,详细分析了弱窄带回波在分析和预报强对流天气中的作用,得出以下结论:(1)上游移动强回波的出流边界导致的弱窄带回波是大风预警的重要判断参考;(2)在合适的层结状态和抬升条件下,弱窄带回波会强烈发展,并导致局地雷雨大风,这类强对流天气的发展有两个比较重要的阶段:弱窄带回波上初始回波的发展和回波跃增;(3)下击暴流造成的地面出流在雷达回波上表现为近似圆弧的弱窄带回波,这种弱窄带回波与其他雷达观测特征以及地面观测相结合,有助于对产生下击暴流的对流云的发生发展过程进行细致分析。
High quality Doppler radar can always catch Narrow-Band Echo（short as NBE hereafter）. Normally, NBE reflects the existence of boundary convergence line. Careful analysis on NBE can facilitate nowcasting of severe weather events and further understanding of their evolution. After detailed study on three cases concerning with NBE, it is concluded： （1） NBE triggered by fast moving echo in upstream is an important indication of disastrous wind; （2） NBE can develop into severe storm under proper conditions. There are often two stages during this kind of growing： the first is developing of initial echo, the second is snap growing of echo core; （3） Doppler radar reflects outflow of downburst as a nearly ringed NBE. Inside look on downburst can be obtained combining NBE with other data.
出处
《气象学报》
CAS
CSCD
北大核心
2006年第1期112-120,共9页
Acta Meteorologica Sinica
基金
上海市气象局科技开发项目(0306)。
