LV Wei-qi,CHEN Yun,LI Cheng-qi,et al.Mesoscale Analysis on a Warm Sector Torrential Rain Event in Huang-Huai Area[J].Journal of Chengdu University of Information Technology,2017,(04):391-401.[doi:10.16836/j.cnki.jcuit.2017.04.009]
黄淮地区一次暖区大暴雨的中尺度特征分析
- Title:
- Mesoscale Analysis on a Warm Sector Torrential Rain Event in Huang-Huai Area
- 文章编号:
- 2096-1618(2017)04-0391-11
- Keywords:
- atmosphericsciences; mesometeorology; warm sector torrential rain; mesoscale convective system
- 分类号:
- P458.1+21.1
- 文献标志码:
- A
- 摘要:
- 为研究黄淮地区暖区大暴雨的中尺度特征,利用常规和非常规观测资料、新一代雷达资料和卫星资料等,针对2013年7月1-2日河北、天津等地出现的一次区域性暖区大暴雨过程的中尺度度特征及触发机制进行分析:此次降水由锋前暖区降水和锋面降水组成,其中暖区降水持续时间长、强度大、中尺度特征明显。结果表明:此次过程中副高深入内陆,川东有西南涡生成,利于暖湿气流向北输送。对流云团对流组织形式为“后向次第发展”,即不断地有小尺度的对流云团在老云团的后部产生。雷达回波有明显的后向传播特征,出现强降水时单体紧密相连,对流高度高,列车效应明显。暖区降水阶段水汽充沛,高湿环境可以降低对流所需的抬升条件并提升增大暖云层厚度,提高降水效率,较强的垂直风切变配合整层高湿环境和较强的CAPE值也可以造成强降水。中尺度边界稳定在强降水关键区,可造成对流的持续触发。
- Abstract:
- To the mesoscale characteristics of warm sector torrential rain events in Huang-huai area, conventional observation data, unconventional observation data, TBB satellite data and radar mosaic products to analysis weather background are used to investigate the formation and mesoscale characteristics of the extreme rain in Hebei province and Tianjin city on July 1 2012. The process of extreme torrential rain consisted of warm area precipitation and frontal precipitation. Moreover the warm area rainfall with obvious mesoscale characteristics of long lasting and concentrating started earlier. The results showed that the westward extension of the subtropical high and the development of the southwest vortex in the east of Sichuan province increased warmer vapor transfering from south to north. Convective system manifested a backward propagation, and the new convective systems mainly formed in the rear part of older convective system. The radar echo represents the backward propagation, and the cells were linked closely, besides, train effects and the convective system belongs to the strong convection type. The whole troposphere with high humidity is not only beneficial to weakening the lifting condition but also enhancing precipitation efficiency by increasing the thickness of warm cloud. The relatively strong vertical wind shear can also lead to the torrential rain with the whole troposphere of high humidity and high CAPE. The mesoscale boundary maintained over the precipitation area for a long time and it played an important role in triggering and maintaining the convection.
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备注/Memo
收稿日期:2017-03-19 基金项目:中国气象局气象预报业务关键技术发展专项资助项目(YBGJXM(2017)1A); 国家自然科学基金面上资助项目(41175048); 公益性行业专项资助项目(GYHY201406003)