摘要
利用地面、探空和雷达实况观测资料,以及ECMWF-ERA5逐小时再分析资料,分析了雅安地区2020年8月29~30日一次区域性大暴雨天气过程。结果表明:台风和副热带高压配合下的低纬环流对此次暴雨天气的低层水汽输送有重要影响。850hPa偏东风低空急流的建立触发了强对流的产生,低空急流的稳定维持为持续性强降水输送了水汽和不稳定能量;低空急流和喇叭口地形的共同影响在雅安东部地区形成了稳定的低涡,并使中尺度对流系统在该地区稳定少动,从而导致了此次区域性大暴雨天气过程。
Based on ground,radiosonde and radar observation data and ECMWF-ERA5 hourly reanalysis data,a regional heavy rain process in Ya'an from 29 to 30 August 2020 was analyzed.The results show that the low latitude circulation under the cooperation of typhoon and subtropical high has an important influence on the low-level water vapor transport in this rainstorm weather.The easterly lowlevel jet at 850hPa triggered the strong convection,and the stable maintenance of the low-level jet transported water vapor and unstable en-ergy for continuous heavy rainfall.The combined effects of the low-level jet and the trumpet topography formed a stable vortex in the east-ern Ya'an region and made the mesoscale convective system stable in the region,resulting in the regional heavy rain weather process.
作者
高国路
李扬
李嘉琪
郭璐璐
GAO Guolu;LI Yang;GUO Lulu;GUO LuLu(Ya'an Meteorological Administration,Ya'an 625000,China;School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Leshan Meteorological Administration,Leshan 614000,China)
出处
《高原山地气象研究》
2022年第S01期19-23,共5页
Plateau and Mountain Meteorology Research
基金
国家自然科学基金项目(U20A2097,42175042,41805054)
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项目(SCQXKJZD202102-6)。
关键词
低空急流
暴雨
“天漏”
低涡
短时强降水
850hPa low-level jet
Heavy rainfall
Ya'An-Tian-Lou
Mesoscale vortex
Short-term strong precipitation
