大连地区短时暴雨雷达回波特征分析  

Analysis on Radar Features of Short-range Torrential Rain Events for Dalian Area

作　　者：李潇潇 刘晓初 赵胡笳[2] 朱轶明[3] Li Xiaoxiao1 et al.(1Dalian Meteorological Observatory, Dalian 116001, China)

机构地区：[1]大连市气象台,辽宁大连116001 [2]中国气象局沈阳大气环境研究所,辽宁沈阳110166 [3]辽宁省人工影响天气办公室,辽宁沈阳110166

出　　处：《安徽农学通报》2018年第20期131-140,共10页Anhui Agricultural Science Bulletin

基　　金：国家自然科学基金"中国东北地区农作物残茬燃烧气溶胶光学特征及对直接辐射效应研究"(41605112)

摘　　要：利用常规观测资料和天气雷达资料对2016—2018年大连地区9次短时暴雨过程进行分析。结果表明,绝大多数过程发生在8月上中旬,雨强极值北部大于南部;背景系统包括冷涡或西风槽,部分有副高和北上热带气旋环流配合,低层有中尺度低涡环流、低空切变线等作为触发条件;探空资料上,K指数,低层比湿,暖云层厚度有一定指示作用;低层大范围湿区和持续的水汽输送强化落区范围,持续时间和降水强度;45dBZ回波高度与0℃层高度差、质心高度、系统走向与移向平行、系统移速慢是短时暴雨雷达回波特征。降水估算中,当副高强盛或热带气旋环流参与时,修订后的热带型Z-R关系更接近实况。9 short-range torrential rain events occurred in Dalian area during 2016-2018 are examined by using con-ventional observation and weather radar data. The results show most events occurred in August. In terms of maximumhourly rainfall amount,the north＇s is lager than that of south;Synoptic systems include low-pressure vortex andwesterly trough,partly with the presence of westward-stretching subtropical high and north-moving tropical cyclonecirculation. Low-level meso-scale vortex and shear line are served as triggers;K index,low-level humidity,LCL,the thickness of warm cloud are useful indicators. Low-level warm and moist regions intensify the scale,duration andintensity of torrential rain;the height difference of 45 dBZ radar reflectivity and 0℃,the height of center of mass,the consistence of storm system direction and its moving direction,low-moving-speed of convective cells are radarfeatures;For rainfall amount estimates,revised tropical mode is the most reliable pattern when subtropical high ortropical cyclone circulation presence.

关 键 词：短时暴雨 中尺度分析 雷达回波特征 降水估测 

分 类 号：P441[天文地球—大气科学及气象学]