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气象:2021,47(9):1086-1098
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海南屯昌儋州台风雨带龙卷双偏振雷达探测分析
李昭春,朱君鉴,张持岸,孙剑,王瑶
(海南省气象探测中心,海口 570203;山东省气象台,济南250031;北京敏视达雷达有限公司,北京 100029;海南省东方市气象局,东方 572600;海南省南海气象防灾减灾重点实验室,海口 570203)
Analysis of Dual Polarization Radar Detection of Tornado Typhoon Rainband in Danzhou and Tunchang in Hainan Province
LI Zhaochun,ZHU Junjian,ZHANG Chian,SUN Jian,WANG Yao
(Hainan Meteorological and Technical Equipment Centre, Haikou 570203; Shangdong Meteorological Observatory, Jinan 250031;Beijing Metstat Radar Co. LTD, Beijing 100029;Dongfang Meteorological Office of Hainan Province, Dongfang 572600;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province, Haikou 570203)
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投稿时间:2020-10-12    修订日期:2020-10-12
中文摘要: 分析了2019年8月29日发生在海南省屯昌县和儋州市龙卷过程的海口双偏振多普勒雷达探测资料。龙卷发生在台风杨柳右前方大约370 km处的台风雨带中的对流风暴单体中,两次龙卷发生都与风暴合并有关联,一次发生在风暴单体合并前12 min,一次发生在风暴单体合并后5 min。单体合并导致风暴反射率因子增强,风暴高度增高,风暴中气旋迅速增强。两次龙卷,雷达都探测到龙卷涡旋特征(TVS),探测到TVS的时间比龙卷发生时间分别提前27 min和5 min。龙卷发生前对应龙卷涡旋特征位置的相关系数(CC)值没有变化,龙卷发生时,龙卷涡旋特征位置的CC值突然减小到0.8以下,龙卷发生后CC的低值特征持续了20 min以上。两次龙卷都有后部风暴单体并入,龙卷发生在主风暴单体的后部、两个风暴单体合并的连接处。
Abstract:The radar data of Haikou dual polarization Doppler during the tornado processes in Tunchang County and Danzhou City of Hainan on 29 August 2019 are analyzed. The tornadoes occurred in a convective storm in the typhoon rain belt about 370 km to the right of Typhoon Podul. Both tornado occurrences were related to the mergering of the storms. One occurred at 12 min before the mergering of the storm cells, and another occurred at 5 min after the storm cells merged. The merger of the cell led to enhancement of the storm reflectivity with the storm height increasing, and the cyclone in the storm strengthened rapidly. Tornadic vortex signature (TVS) was detected during two tornadoes, and the time of detection of TVS was 27 min and 5 min earlier than the time of the tornadoes. Corresponding to the position of the TVS before the tornado occurred, the correlation coefficient (CC) value did not change. When the tornado occurred, the CC value of the position of the TVS suddenly decreased to below 0.8, and the low-value of the CC continued for more than 20 min after the tornado occurred. Both tornadoes had the rear storm cells merged. The tornado occurred at the rear of the main storm cells at the junction where the two storm cells merged.
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基金项目:国家重点研发计划项目(2018YFC1506104,2018YFC1506102)和海南省南海气象防灾减灾重点实验室开放基金项目(SCSF201904)共同资助
引用文本:
李昭春,朱君鉴,张持岸,孙剑,王瑶,2021.海南屯昌儋州台风雨带龙卷双偏振雷达探测分析[J].气象,47(9):1086-1098.
LI Zhaochun,ZHU Junjian,ZHANG Chian,SUN Jian,WANG Yao,2021.Analysis of Dual Polarization Radar Detection of Tornado Typhoon Rainband in Danzhou and Tunchang in Hainan Province[J].Meteor Mon,47(9):1086-1098.