ZHANG Wulong,KANG Lan,TAO Yong,et al.Organizational Modes of the Mesoscale Convective System in Extreme Flash-Rain Process in Sichuan Basin[J].Journal of Chengdu University of Information Technology,2021,36(06):697-704.[doi:10.16836/j.cnki.jcuit.2021.06.017]
四川盆地极端短时强降水中尺度对流系统组织类型
- Title:
- Organizational Modes of the Mesoscale Convective System in Extreme Flash-Rain Process in Sichuan Basin
- 文章编号:
- 2096-1618(2021)06-0697-08
- 分类号:
- P456.7
- 文献标志码:
- A
- 摘要:
- 为提升四川盆地极端降水短临预警能力,利用2013-2019年5-9月SWAN系统新一代天气雷达组合反射率因子资料和常规观测资料,对四川盆地极端短时强降水中尺度对流系统(MCS)组织类型特征进行统计分析,结果表明:(1)四川盆地极端短时强降水MCS可分为6种类型:尾随层状云类(TS)、邻近层状云类( TL/AS)、平行层状云类(PS)、后向扩建类(BB/QS)、涡旋类(VS)和无组织对流类(UC)。(2)TS、TL/AS和PS组织形态都为线状对流,但其系统移动以及新生单体发展等特征有所不同。TL/AS和PS通过单体新生发展移动所产生的列车效应造成极端短时强降水。BB/QS单体后向传播特征突出,VS组织形态呈明显的涡旋状。(3)TS和PS集中在盆地西部,前者多向偏西移动,后者多向偏北移动; TL/AS和VS多出现在盆地西南部、南部和中部,移动方向主要为偏东或偏东北方向; BB/QS和UC多向偏北方向移动。VS持续时间最长,其他类型MCS持续时间相对较短。从日变化特征来看,00-06时是各类MCS的高发时段。
- Abstract:
- In order to improve the nowcast warning ability of extreme precipitation, using the composite radar reflectivity data and conventional observation datasets, this study investigates organizational mode features of the mesoscale convective system in extreme flash-rain process between May and September during 2013-2019 in Sichuan basin. The results show that:(1)the extremely short-term heavy precipitation MCS in Sichuan Basin can be divided into six types: Trailing Stratiform(TS), Training Line/Adjoining Stratiform(TL/AS), Parallel Stratiform(PS), Back-Building/Quasi-Stationary(BB/QS), Vorticity Stratiform(VS)and Unorganized Convection(UC).(2)The tissue morphology of TS, TL/AS and PS mode is linear MCSs, but their system movement and new cells generation are different. TL/AS and PS mode can make train effect by new cells generation and movement, which causes extreme flash-rain easily. The cell backword propagation is remarkable in BB/QS mode, and VS mode have a defined feature of vortex.(3)TS and PS mode are formed in the western basins, which mostly move westward and northward respectively. TL/AS and VS mode usually occur in the southwestern, southern and central basin, and their movement direction is often eastward or northeastward. BB/QS and UC mode mainly move northward. VS mode has the longest duration, while other modes are relatively shorter in duration. Diurnal varation shows that the peak time of MCSs occurrence is from 0 am to 6 am.
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备注/Memo
收稿日期:2020-11-25
基金项目:中国气象局预报员专项资助项目(CMAYBY2020-110); 高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金资助项目(SCQXKJQN2019001); 四川强对流预报创新团队(川气函〔2017〕313号)和全国强对流预报专家团队建设共同资助项目