大气科学2026，Vol.50Issue(2)：378-398,21.DOI:10.3878/j.issn.1006-9895.2505.24087
基于雷达资料快速更新同化的一次浙西雷暴大风过程数值研究
Numerical Study of a Severe Wind-Producing Thunderstorm in West Zhejiang Province Based on Assimilation of Radar Data
摘要
Abstract
The cloud-resolving scale detection and analysis of mesoscale dynamics and hydrometeors based on radar data assimilation are key to simulating and predicting severe thunderstorms and analyzing their formation and evolution mechanisms.In this study,based on the rapid updating and assimilation of S-band weather radar data,we reproduced a squall line accompanied by severe convective winds over the mountainous regions of western Zhejiang Province and discussed the mechanisms for the mesoscale dynamical and microphysical processes involved.This in-depth study shows that:(1)Rapid updating and assimilation of radar radial winds were crucial for reproducing the organizational progress of the squall line.The evolution and adjustment of mesoscale dynamics determined the development of the severe wind-producing convection system.(2)Cloud-resolved radar radial wind assimilation strengthened the mid-layer rear inflow and convection outflows and their convergence in the lower troposphere,which facilitated the organization of the squall line.(3)Assimilation of radar radial winds and reflectivity significantly changed the hydrometeor characteristics and enhanced the cooling of graupel melting below the 0℃ layer in the stratiform region,as well as the evaporation of low-level raindrops.Consequently,the rear inflow descended along the slope toward the front of the convection while extending into the stratiform cloud region.This phenomenon played a key role in momentum transmission from mid-and high-level to the ground.(4)The rapid development of mesoscale dynamics and hydrometeors resulted in adiabatic warming generated by rear inflow downdrafts,which facilitated the evaporation of low-level raindrops and the strengthening of the cold pool.The contributions of the downward transport of high-level large momentum transmission and strong horizontal pressure gradient force near the surface greatly enhanced the formation of severe winds.关键词
雷达资料同化/飑线/雷暴大风/中尺度动力场/微物理过程Key words
Radar assimilation/Squall line/Severe winds/Mesoscale dynamics/Microphysical process分类
天文与地球科学引用本文复制引用
孙杭媛,刘亚楠,李京原,平凡,毛程燕,王健疆,李吉..基于雷达资料快速更新同化的一次浙西雷暴大风过程数值研究[J].大气科学,2026,50(2):378-398,21.基金项目
国家重点研发计划项目2023YFC3007700,国家自然科学基金项目42305012,浙江省自然科学基金项目ZJMD24D050002,中国气象局东北冷涡重点开放实验室联合开放基金项目2024SYIAEKFMS02,中国气象局气象软科学研究课题"气象灾害防御区域协同机制探索与应用"2025RKXZDIAN25 National Key Research and Development Program of China(Grant 2023YFC3007700),National Natural Science Foundation of China(Grants 42305012),Zhejiang Provincial Natural Science Foundation(Grant ZJMD24D050002),Open Project Fund of Key Laboratory of Northeast Cold Vortex Research China Meteorological Administration(Grant 2024SYIAEKFMS02),China Meteorological Administration Meteorological Soft Science Research Project"Exploration and Application of Regional Collaborative Mechanism for Meteorological Disaster Prevention"(Grant 2025RKXZDIAN25) （Grant 2023YFC3007700）
