气象学报2025，Vol.83Issue(2)：179-192,14.DOI:10.11676/qxxb2025.20240075
泰山地区暴雨日中尺度对流系统的组织形态演变及地形的可能影响
Organization of mesoscale convective systems during rainstorm days in the Tai mountain area:Evolution and possible influence of topography
摘要
Abstract
To study the organization mode and evolution characteristics of mesoscale convective systems(MCS)that cause heavy rain during rainstorm days in Tai mountain area as well as possible influence of terrain,the modes and evolution characteristics of MCS are analyzed using the new generation composite radar reflectivity data,satellite data and operational observation data from May to October during 2020-2022.The results show that MCSs in Tai mountain area can be divided into six classes:Nonline-MCS(NL),Embedded line MCS(EL1),Embedded lines MCS(EL2),Trailing stratiform MCS(TS),Training line MCS(TL)and Parallel stratiform MCS(PS).Four of them are the same as previously classified archetypes,and the EL2 and TL are two new statistical classes in Tai mountain area.On satellite cloud charts,the six classes often appear as irregular ovals or long stripes with the highest black body temperature(TBB)below-50℃,making it difficult to distinguish detailed mode of MCS.However,the new generation of weather radar data can make up for this defect.According to the analysis,NL,EL1 and EL2 are the main classes affecting the Tai mountain area,accounting for 86%of the total samples,and EL1 is the most common.EL1 class,including the embedded line(EL)in existing research results and the convective line without stratiform rainfall(NS),originates in the area from Xingtai to Dezhou and Liaocheng,and mostly moves along the southeastern direction.The second most common class is the NL,which generates in the Tai mountain area with strong echoes dispersed and little movement;the third is the EL2 class,which generates in the area between Kaifeng and Heze,and mostly moves along the northeastern direction after formation.Except for the EL2 and PS,the other classes appear with a distinct diurnal variation,showing two peaks in the afternoon and at night respectively.Tai mountain has impacts on the intensity,shape,moving speed and direction of most rainfall echoes,especially on the formation of TS and the transformation of NL into EL1 and EL1 into EL2 or NL.According to statistics,only 12%of MCS modes do not change significantly,and the rest of the samples change every 1.5-3 h.In contrast,NL is not only one of the main classes that cause heavy rain in Tai mountain area,but also an intermediate mode in the evolution of other MCS in many cases.关键词
泰山地区/暴雨日/中尺度对流系统/组织形态Key words
Tai mountain area/Rainstorm days/MCS/Organizational modes分类
天文与地球科学引用本文复制引用
郑丽娜,俞小鼎,孙骞,蔚立存,李传浩..泰山地区暴雨日中尺度对流系统的组织形态演变及地形的可能影响[J].气象学报,2025,83(2):179-192,14.基金项目
2024年度中国气象局决策气象服务专项、泰山山脉气象科学试验团队项目. （）
