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气象:2007,33(1):25-31
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台风远外围大范围强对流天气成因综合分析
(广州中心气象台,510080)
Comprehensive Analysis on an Extensive Summer Severe Convection in Outer Periphery of Typhoon
(Guangzhou Central Meteorological Observatory, 510080)
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投稿时间:2006-09-29    修订日期:2006-11-28
中文摘要: 为加深对台风外围发生的强对流天气的认识,提高对华南地区强对流天气潜势预报 和预警的能力,利用广东中尺度天气监测网的多普勒雷达、自动站资料和NCAR/NCEP的再分 析资料等对2004年8月发生在台风云娜外围一次强对流天气的天气形势背景、水汽、CAPE、S I、WI、垂直速度和海风辐合等进行了综合分析。结果表明:华南前期受副热带高压和云娜 外围下沉气流作用,地面连续高温,使低层大气内能不断积蓄;台风云娜向西北移动的过程 中,华南上空的副热带高压和下沉气流减弱,在其外围弱低压槽、海风辐合和干线共同 作用下触发了强对流;台风外围的稳定度具有明显的波动性,强对流在台风外围螺旋云带末端 的高温、不稳定和相对高湿舌发生;风指数WI用于华南地区雷雨大风预报比其它指数更有效。
中文关键词: 台风外围  强对流  高温  海风  CAPE  WI
Abstract:In order to further understand the severe weather originating in the p eriphery of typhoons and improve the capability of severe weather potential fore cast and warning, the synoptic background, water vapor, CAPE, WI, vertical veloc ity and sea breezes are analyzed on a severe convection weather occurring in out er periphery of Typhoon Rananim in August 2004 based on the Doppler radar, autom atic weather station and NCAR/NCEP reanalyzed data etc. The continual heat wave in South China resulted from the subsidence from subtropical high and the periph ery of Typhoon Rananim, consequently, internal energy is accumulated,and strong instable state is established. When the subtropical high weakened and the subsidence disappeared a s a result of northwestward moving of Typhoon, the severe convection is triggere d by the weak trough and sea breeze and a dry line. The stabi lity outsides the typhoon is of fluctuant characteristics. The convection develo ped on an instable tongue with higher temperature and higher humidity that joint with the end of an exterior spiral cloud band of Typhoon Rananim. Wind Index is more available in forecasting thunderstorm wind gusts than other indexes in Sou th China.
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基金项目:广州中心气象台科研基金资助
引用文本:
黄忠,张东,蔡安安,方一川,叶爱芬,2007.台风远外围大范围强对流天气成因综合分析[J].气象,33(1):25-31.
Huang Zhong,Zhang Dong,Cai Anan,Fang Yichuan,Ye Aifen,2007.Comprehensive Analysis on an Extensive Summer Severe Convection in Outer Periphery of Typhoon[J].Meteor Mon,33(1):25-31.