华南前汛期珠江流域两类暖区飑线特征分析
Characteristics of two kinds warm-sector squall lines in the Pearl River Basin during the pre-flood season in South China
张小雯 1盛杰 2滑申冰 3郑永光 2刘鑫华 2麦子2
作者信息
- 1. 国家气象中心,北京 100081;中国气象局水文气象重点开放实验室,北京 100081
- 2. 国家气象中心,北京 100081
- 3. 中国电力科学研究院有限公司,北京 100192
- 折叠
摘要
利用2016-2019年4-6月雷达三维拼图资料,根据触发条件的差异,划分华南前汛期暖区飑线为锋面触发暖区发展(Ⅰ型暖区飑线)与暖区触发并发展(Ⅱ型暖区飑线)两类;在此基础上针对飑线造成短时强降水和雷暴大风的分布,对比了飑线发生时的大尺度环境条件和中尺度雷达回波特征.结果表明:Ⅰ型暖区飑线大多形成于平原地区,Ⅱ型暖区飑线大多生成于山脉迎风坡和海岸线;两类飑线发生时均伴有明显的短时强降水,易造成暴雨洪涝;Ⅰ型暖区飑线易产生区域性雷暴大风,Ⅱ型暖区飑线产生分散性雷暴大风;Ⅰ型暖区飑线生命史长,对流发展更旺盛,飑线移动速度快;Ⅱ型暖区飑线生命史短,飑线移动速度慢,回波强度弱于Ⅰ型暖区飑线;两类飑线都有较好的水汽条件和0～3 km低层风垂直切变条件,Ⅰ型暖区飑线发生时动力和热力条件更好.
Abstract
Based on the three-dimensional radar mosaic data from April to June in 2016-2019 and the differences in triggering conditions,a classification for warm-sector squall lines with vastly different formation mechanisms during the pre-flood season was proposed.They were divided into two types:squall lines that developed in the warm sector after frontal triggering(Type Ⅰ warm-sector squall lines),and squall lines that were generated and developed in the warm sector(Type Ⅱ warm-sector squall lines).On this basis,the distributions of short-term heavy rainfall and thunderstorm winds were compared in terms of large-scale environmental conditions and mesoscale radar echo characteristics during the occurrence of squall lines.The results showed that:Type Ⅰ warm-sector squall lines were mostly formed in plain areas,while Type Ⅱ warm-sector squall lines were mostly generated on the windward slopes of mountains and coastlines.Both squall lines were accompanied by obvious short-term heavy precipitation,which was easy to cause rainstorm and flood;Type Ⅰ warm-sector squall lines were prone to producing regional thunderstorm winds,while Type Ⅱ warm zone squall lines produce scattered thunderstorm winds.The Type Ⅰ warm-sector squall lines had longer lifecycle,more vigorous convective development,and a faster moving speed,while the Type Ⅱ warm-sector squall lines had shorter lifecycle and a slower moving speed with weaker echo intensity.Both types of squall lines had good water vapor conditions and vertical shear conditions of low-level winds at 0-3 km,and the dynamic and thermal conditions are better when Type Ⅰ warm zone squall lines occurred.
关键词
珠江流域/暖区飑线/华南前汛期/空间分布/中尺度特征/环境参数Key words
Pearl River Basin/warm-sector squall lines/pre-flood season in South China/spatial distribution/mesoscale features/environmental parameters引用本文复制引用
基金项目
国家自然科学基金面上项目(42175001)
中国气象局水文气象重点开放基金项目(23SWQXZ001)
创新发展专项项目(CXFZ2024J001)
国家重点研发计划项目(2022YFC3004104)
中国气象局重点创新团队项目(CMA2022ZD07)
中国气象局重点创新团队项目(CMA2023QN06)
出版年
2024
国家科技期刊平台
NSTL
万方数据