报告题目：General features and synoptic-scale environments of mesoscale convective systems over South China during the 2013–2017 pre-summer rainy seasons
报告人：罗亚丽 教授
邀请人：薛明 教授
时间：2023年12月22日，周五下午15:30-17:00
地点：大气科学楼D103
报告摘要:
This study analyzes general features and circulation patterns of 98 quasi-linear meso-scale convective systems (MCSs) over South China (SC) during May 1 to June 15, 2013–2017 using high resolution gridded radar network dataset and the obliquely rotated principal component analysis in T mode. The MCSs prefer to form over northwest SC (N-GX) around midnight, and over southwest SC (S-GX) and Pearl River Delta (PRD) in east SC in the morning. After formation, the MCSs over N-GX, S-GX, and PRD are prone to move southeasterly, northeasterly, and easterly, respectively. Five organization modes of MCSs are identified at their mature stages: a convective line with trailing stratiform precipitation (TS), without stratiform precipitation (NS), embedded in stratiform precipitation (EL) or with parallel stratiform precipitation (PS), and multiple convective lines with stratiform precipitation (MLS). The MLS mode mainly presents near the coastline with the longest lifespan (about 6.6 h) and lowest moving speed (about 14.0 km h−1), while the TS mode widely spreads over SC with the fastest moving speed (about 44.6 km h−1) and the second-longest lifespan (about 5.4 h). Transition of the modes during the MCSs’ lifetime is revealed. The circulation patterns in the lower troposphere around SC during the analysis period are classified into six types. The MCSs mostly (about 80%) occur in three types featured with stronger low-level southwesterly winds compared with the other three patterns. With the three favorable patterns, positive anomalies of convective available potential energy and surface-to-700 hPa vertical wind shear are observed on the days with MCSs. The circulation patterns are also closely associated with the different movement of MCSs formed in N-GX, S-GX and PRD.
报告人简介：
罗亚丽，南京信息工程大学教授。主要研究云降水过程和暴雨、强对流等灾害天气演变与变化机理及数值模拟。发表学术论文百余篇，其中SCI收录90篇。主持国家重点研发计划项目等科研项目。曾多次入选中国气象局科技领军人才，作为教学团队成员获得中国科学院大学公司产品成果奖一等奖。现任亚洲大洋洲地球科学协会（AOGS）大气科学分部侯任主席、Geoscience Letters期刊编辑、WMO 世界天气研究计划（WWRP）InPRHA（早期行动的降水与水文综合预报）项目 Steering Group成员等兼职。
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