| 摘要: |
| 【 目的】对比分析 2023 年昆明主城区主汛期 7 月 28 日（过程 1) 和 8 月 5 日（过程 2)2 次最强的局地大暴雨过 程。【方法】利用 NCEP( 1 °×1 °)FNL 资料和多种加密观测资料，基于天气学诊断分析。【结果】过程 1 在降水强度、降水量、强 降水范围和对流环境方面均小于过程 2 。过程 1 的主要影响系统是切变线、印度半岛的热带低压和南海台风 “杜苏芮 ”；过程 2 的是大陆高压外围（西南侧）的偏南气流、印度半岛、中南半岛的热带低压和南海台风“卡努 ”。平均径向速度显示，2 个过程 最大小时雨量站点附近 4 个体扫出现了弱到中等强度的中气旋，可推测有超级单体风暴生成，导致较强雨强产生。过程 1 雷 达回波主要演变特征为在切变线附近不断有对流单体风暴生成，后向传播特征明显，形成 NW-SE 向块状混合性回波缓慢西南 移；过程 2 雷达回波主要特征为在大陆高压外围偏南气流控制下形成块状混合性回波，风速较小，后向传播特征明显，块状混 合性回波少动。【结论】加深对此类天气过程的了解和认识，可为昆明主城区局地大暴雨预报提供参考。 |
| 关键词: 局地大暴雨；对比分析；降水强度；雷达回波；逆风区；昆明主城区 |
| DOI： |
| 投稿时间：2024-03-02修订日期：2024-07-08 |
| 基金项目:国家自然科学基金项目(42375043 、42365007) ; 中国气象局水文气象重点开放实验室课题(23SWQXZ008) ; 云南省气象局创新团队项目 (2022CX01) ; 中国气象局复盘总结专项 ( FPZJ2023 - 122) ; 云南省气 象局科研项目( YZ202306 、YZ202450) |
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| Comparative Analysis of Two Local Heavy Torrential Rain Processes During Main Rainy Season in Urban Area of Kunming City |
| WANG Tindong,WANG Jiang,MA Zhimin,Zou Yang,LIU Bin |
| (Kunming Meteorological Bureau of Yunnan Province;Kunming Meteorological bureau of Yunnan Province;Yunnan Meteorological Observatory) |
| Abstract: |
| Based on NCEP ( 1 °×1 °) FNL data and various frequently-observed data as well as the synoptic analysis method , two extreme local heavy rainstorm processes on July 28 ( Process 1) and August 5 ( Process 2) during main rainy season in 2023 in main urban area of Kunming are compared and analyzed . The results are as follows . Process 1 was weaker than Process 2 in terms of precipitation intensity , precipitation amount , severe precipitation range , and convective environment. The major impact systems of Process 1 were the shear line , the tropical depression over the Indian Peninsula , and the South China Sea Typhoon Doksuri , while Process 2 was influenced by the southerly airflow in the southwest periphery of the continental high-pressure system , the tropical depression in the Indian Peninsula and Indochina Peninsula , and the South China Sea Typhoon Khanun . The average radial velocity shows that four volume scans near the maximum hourly rainfall stations during the two processes experienced weak-to-moderate intensity mesocyclones , which suggests the formation of supercell storms leading to the generation of severe rainfall intensity. The main radar echoes evolution feature of Process 1 was the continuous generation of convective cell storms near the shear line , with obvious backward propagation characteristics , forming NW-SE block-shaped mixed echoes slowly moving southwest. By contrast , Process 2 was featured with the formation of block-shaped mixed echoes under the control of southward airflow in the periphery of the continental high pressure , with low wind speed and obvious backward propagation . Moreover , the block-shaped mixed echoes were not so active . The findings of this research can deepen the understanding of such processes and provide references for the local heavy rainstorm forecasting in urban area of Kunming City. |
| Key words: local heavy rainstorm; comparative analysis; precipitation intensity; radar echo; upwind region; main urban area of Kunming City |
