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华南前汛期珠江流域两类暖区飑线特征分析

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  • NSTL
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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.
Characteristics of two kinds warm-sector squall lines in the Pearl River Basin during the pre-flood season in South China
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.

Pearl River Basinwarm-sector squall linespre-flood season in South Chinaspatial distributionmesoscale featuresenvironmental parameters

张小雯、盛杰、滑申冰、郑永光、刘鑫华、麦子

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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

中国电力科学研究院有限公司,北京 100192

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

国家自然科学基金面上项目中国气象局水文气象重点开放基金项目创新发展专项项目国家重点研发计划项目中国气象局重点创新团队项目中国气象局重点创新团队项目

4217500123SWQXZ001CXFZ2024J0012022YFC3004104CMA2022ZD07CMA2023QN06

2024

10.3876/j.issn.1000-1980.2024.04.002

河海大学学报(自然科学版)
河海大学

河海大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.803
ISSN：1000-1980
年,卷(期)：2024.52(4)