气象2026，Vol.52Issue(1)：70-82,13.DOI:10.7519/j.issn.1000-0526.2025.071801
大巴山和平行岭谷地形对中尺度对流系统及暴雨的作用
Effect of Daba Mountain and the Parallel Ridge-Valley Topography on Mesoscale Convective Systems and Heavy Rainfall
摘要
Abstract
Using automatic station data,ERA5 reanalysis data,and radar detection data,this paper analy-zes the synoptic situation,mesoscale convective system and propagation characteristics,as well as the combined effects of the parallel ridge-valley in East Sichuan Region and the Daba Mountain on a heavy rain-fall event in 17-18 June 2021.The results show that the heavy rainfall occurred in the junction area of the Daba Mountain and the parallel ridge-valley region,and it went through three stages of evolution of meso-scale convective systems.Multiple northeast-southwest oriented strip-shaped convective systems were organized developing along the mountains of the parallel ridge-valley,with convective cell train effects and rainband stacking effects intensifying the precipitation.The cold front over the basin and the surface con-vergence line played an important role in triggering and organizing the mesoscale convective systems.Ad-ditionally,the cold front over the basin interacted with the eastward-moving cold air invading along the Wushan Mountain and the Yangtze River Valley,leading to the strengthening and maintenance of the con-vective systems.The role of the Daba Mountain in the heavy rainfall was reflected in the blocking effect and thermodynamic uplift.The windward slope of the terrain had a blocking and converging effect on the transport of water vapor and energy,with east-west oriented water vapor convergence belts and high pseudo-equivalent potential temperature areas maintaining on the southern slope of the Daba Mountain.The boundary layer frontogenesis,positive vorticity areas,low-level convergence areas,and upward motion areas developed along the slope of the Daba Mountain.The role of the parallel ridge-valley terrain in pre-cipitation was reflected in the aggregation of boundary layer water vapor,the quasi-stationary maintenance of the surface convergence line,and the formation of mesoscale occlusion fronts,which caused the meso-scale convective systems to move northward to the southern slope of the Daba Mountain.The mesoscale convective systems stagnated there and developed vigorously,thus triggering this heavy rainfall event in the mountainous area.关键词
山区大暴雨/大巴山/川东平行岭谷/中尺度对流系统/地形作用Key words
mountainous heavy rainfall/Daba Mountain/the parallel ridge-valley in eastern Sichuan/mesoscale convective system/terrain effect分类
天文与地球科学引用本文复制引用
罗娟,李国平,刘超,刘俸霞,陈泠羽..大巴山和平行岭谷地形对中尺度对流系统及暴雨的作用[J].气象,2026,52(1):70-82,13.基金项目
国家自然科学基金项目(42175002)、中央引导地方科技发展项目(2024ZYD0175)和重庆市气象部门人才支持性项目(RCZC-202301)共同资助 （42175002）
