报告人：杨明仁 教授（台湾大学大气科学系）
报告题目：A modeling study of the severe afternoon thunderstorm event at Taipei on 14 June 2015: The roles of sea breeze, microphysics, and terrain
报告时间：2019年4月16日（周二）下午14：00
报告地点：气象楼423会议室
主 持 人：张文君 教授
报告摘要：
On 14 June 2015, a severe afternoon thunderstorm event associated with cell merger developed within the Taipei basin, which produced intense rainfall (with rainfall rate of 131 mm/h) and urban-scale flooding. Cloud-resolving WRF simulations were performed to capturereasonably well the onset of see breeze, the development and evolution of convective cells, and several cell mergers within the afternoon thunderstorm system. The WRF model hadfour nested grids(with the finestgrid size of 0.5 km)in the horizontal and 55 layers in the vertical to explicitly resolve the deep convective cells inside the thunderstorm. It is found that convection was initiated by sea breeze at foothill and by upslope wind from the valley at mountain peak, respectively. Convective available potential energy (CAPE) was increased by 800 to 3200 J/kg with abundant moisture transport by the sea breeze from 08 to 12 LST, fueling large thermodynamic instability for the development of afternoon thunderstorm. The strong convergence between sea breeze and cold-air outflow triggered further development of intense convection, resulting in heavy rainfall over Taipei city. Microphysics sensitivity experiments show that evaporative cooling played a major role in the propagation and intensification of cold-air cold outflow, while melting cooling played a minor role. The terrain-removal experiment indicates that the local topography of Mount Datun may produce the channel effect through Danshui River Valley, intensify sea-breeze circulation and transport more moisture, increase CAPE and result in stronger thunderstorm with heavier rainfall.
气象灾害教育部重点实验室
气象灾害预报预警与评估协同创新中心
大气科学学院
2019年04月12日
杨明仁教授简历
1986年本科毕业于台湾师范大学大气科学专业，1995年获美国华盛顿大学大气科学专业博士学位，师从著名的气象专家Robert A. Houze 教授，并从事博士后研究一年。1996-1999年，在台湾气象局工作。1999-2012年，在台湾中国文化大学和中央大学任副教授，2012-2014年，在台湾中央大学任全职教授，2014年至今在台湾大学大气科学系任全职教授。长期从事降水物理学、云动力学、中尺度气象和模拟以及对流和水循环过程研究。发表SCI论文32篇，平均论文引用次数22.25次，高被引指数 h-index ：16。曾多次获台湾中央大学杰出研究奖，美国大气科学编辑奖。