演讲人：路平 博士

题目：Assessing Hurricane Rainfall Mechanisms Using a Physics Based Model:Hurricanes Isabel (2003) and Irene (2011)

日期：2019年11月11日（星期一）      时间：13:30-15:00

地点：深圳大学城哈工大校区E418

内容摘要：

We examine a recently developed physics-based tropical cyclone rainfall (TCR) model and apply it to assess the mechanisms that dominate the magnitude and spatial distribution of TC rainfall, with Hurricanes Isabel (2003) and Irene (2011) as study cases. We evaluate the TCR model using Weather and Research Forecasting (WRF) Model simulations. TCR accounts for four major rainfall mechanisms: surface frictional convergence, vortex stretching, interaction of the storm with topography, and interaction of the storm with large-scale baroclinity. We show that these rainfall mechanisms affected the rainfall pattern differently for Isabel and Irene. Frictional convergence is the dominant factor, while other mechanisms are also significant. The frictional convergence depends on the boundary layer formulation, which is relatively simple in TCR and may require calibration of boundary layer parameters. Furthermore, we find that the TC rainfall distribution is strongly dependent on the temporal and spatial variation of the TC wind field, mediated by the physical mechanisms represented by TCR. When coupled with various analytical wind models, TCR generally captures the rainfall distribution, with the Holland wind model performing the best.

个人简介：

路平，清华大学地球系统科学系博士后。2012年于清华大学环境学院获得工学学士学位，2018年于普林斯顿大学市政与环境工程系水资源方向获得哲学博士学位。2018年至今在清华大学地学系做博士后，主要研究兴趣为台风降雨模拟、洪水的空间分布与灾害足迹。在Journal of Hydrometeorology 上发表文章《Spatial Characterization of Flood Magnitudes over the Drainage Network of the Delaware River Basin》，在Journal of the Atmospheric Sciences 上发表文章《Assessing Hurricane Rainfall Mechanisms Using a Physics-Based Model: Hurricanes Isabel (2003) and Irene (2011)》。