摘要
利用GFS0.5°×0.5°再分析资料以及卫星、多普勒雷达等观测资料,对2012年7月12日红安特大暴雨过程进行分析。结果表明,大别山复杂地形对降水有显著增幅作用,地形影响气流理论很好地解释了此次特大暴雨降水分布,大别山地形迫使西南气流抬升,"指状云团"在大别山迎风坡不断生成,有效地促成后向传播系统,延长了强降水的时间;雷达径向速度场的变化表明,大别山与桐柏山中间的冷暖空气通道对中尺度系统的形成和发展起了重要的作用;雷达回波特征分析表明,0℃层以下>45 dBz回波垂直伸展厚度、垂直液态含水量(VIL)大小与雨强有非常好的一致性。
By using GFS 0.5°×0.5° reanalysis data, satellite data and Doppler radar, the torrential rain in Hong'an on July 12 th, 2012 is analyzed, results show that the complex terrain of the Dabie Mountain has significant effects on the increase of precipitation. 'Influence of topographic on flow theory'provides a good explanation of the precipitation distribution. The southwest current is forced to lift by the special terrain in Hong'an, and the continuously generation of finger cloud cluster in the windward slope of the Dabie Mountain which promotes the backward transmission system effectively, extends the period of the heavy rain. The variation of radar radial velocity field shows that the cold and warm air corridor between the Dabie Mountain and Tongpai Mountain plays an important role in the formation and development of the mesoscale system. By analyzing the radar echo characteristics it was found that the vertically stretching thickness of the echo which is greater than 45 dBz under 0 ℃ layer and vertically integrated liquid water has very good consistency with rainfall intensity.
出处
《沙漠与绿洲气象》
2014年第4期18-25,共8页
Desert and Oasis Meteorology
基金
2013年预报员专项(CMAYBY2013-044)资助
关键词
特大暴雨
滤波
指状云团
地形抬升
torrential rainfall
filtering
finger cloud cluster
topographic lifting
