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气象:2020,46(2):212-222
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四川盆地雷暴大风雷达回波特征统计分析
龙柯吉,康岚,罗辉,郭旭,周秋雪,费海燕,吴薇,张琪
(四川省气象台,成都 610072; 高原与盆地暴雨旱涝灾害四川省重点实验室,成都 610072; 四川省气象探测数据中心,成都 610072; 中国气象局气象干部培训学院 ,北京 100081)
Statistical Analysis of Radar Echo Characteristics of Thunderstorm Gales in Sichuan Basin
LONG Keji,KANG Lan,LUO Hui,GUO Xu,ZHOU Qiuxue,FEI Haiyan,WU Wei,ZHANG Qi
(Sichuan Meteorological Observatory, Chengdu 610072; Heavy Rain and Drought Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072; Sichuan Meteorological Observation and Data Centre, Chengdu 610072; China Meteorological Administration Training Centre, Beijing 100081)
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投稿时间:2019-02-01    修订日期:2019-12-11
中文摘要: 采用2009—2018年地面、高空、闪电定位、多普勒雷达资料统计出四川盆地的34次雷暴大风过程,并根据冷空气参与情况及500 hPa影响系统将其分为五种类型:混合性大风类(Ⅰ类)、深厚低槽(低涡)后部类雷暴大风(Ⅱ 1)、低槽(切变)东移类雷暴大风(Ⅱ 2)、副热带高压西侧切变类雷暴大风(Ⅱ 3)和东风扰动类雷暴大风(Ⅱ 4)。统计分析了五类过程中发生雷暴大风站点对应的雷达回波特征,包括:对流组织类型、雷达回波强度、回波顶高、垂直液态水含量、中层径向辐合、风暴移动速度、回波质心下降、低仰角风速大值区和辐散。结果表明,82%的雷暴大风站点具有风速大值区,不同类型的雷暴大风过程还有其他不同的雷达回波特征,这些特征大多可提前10 min以上。另外,当站点出现中层径向辐合、辐散、回波强度大且伴有强梯度或回波类型为飑线时,也要考虑大风是否出现。
Abstract:By using data of surface, upper air, lightning location and Doppler weather radar from in Sichuan Basin during 2009-2018, 34 cases of thunderstorm gale processes are counted out. And on the basis of cold air participation and 500 hPa impact system, these thunderstorm gale processes can be divided in to five types: mixed gale (Ⅰ), thunderstorm gale behind deep trough (vortex) (Ⅱ 1), trough (shear) moving eastward thunderstorm gale (Ⅱ 2), shear thunderstorm gale on west side of subtropical high pressure belt (Ⅱ 3), 〖JP2〗and east wind disturbance thunderstorm gale (Ⅱ 4). Besides, the radar echo characteristics of thunderstorm gale stations in the five kinds of processes are analyzed statistcally, including convective organization type, radar echo intensity, echo tops, vertical integrated liquid, mid altitude radial convergence, storm moving speed, echo centroid decline, high value area of wind speed at low elevation and divergence. The results show that 82% thunderstorm gale stations have high value areas of wind speed, different types of thunderstorm gale have other different warning indicators, and all these warning indicators can be advanced by more than 10 minutes. Furthermore, when there is mid altitude radial convergence, divergence, high echo intensity with strong gradient or echo type being squall line at station, we should also consider the possibility of strong wind.
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基金项目:国家自然科学基金面上项目(41875058)、中国气象局“全国强对流预报专家团队建设”项目、高原与盆地暴雨旱涝灾害四川省重点实验室青年专项项目(SCQXKJQN2019018)、中国气象局预报员专项(CMAYBY2018 064、CMAYBY2019 097)、四川强对流预报创新团队[川气函(2017)313号]、国家重点研发计划(2018YFC1506104)和四川省科技厅应用基础研究项目(2019YJ0316)共同资助
引用文本:
龙柯吉,康岚,罗辉,郭旭,周秋雪,费海燕,吴薇,张琪,2020.四川盆地雷暴大风雷达回波特征统计分析[J].气象,46(2):212-222.
LONG Keji,KANG Lan,LUO Hui,GUO Xu,ZHOU Qiuxue,FEI Haiyan,WU Wei,ZHANG Qi,2020.Statistical Analysis of Radar Echo Characteristics of Thunderstorm Gales in Sichuan Basin[J].Meteor Mon,46(2):212-222.