文献类型：期刊文献

英文题名：Impacts of Nonuniform Vertical Resolution Enhancement on Simulated Typhoon Lekima Intensity

作者：Lian, Qinlai[1,2,3]; Zhang, Yu[1,2,3]; Xu, Jianjun[1,2,3]; Liu, Xiaoyu[1,2,3]

机构：[1] Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, China; [2] CMA-GDOU Joint Laboratory for Marine Meteorology, South China Sea Institute of Marine Meteorology, Guangdong Ocean University, Zhanjiang, China; [3] Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230171346)

语种：英文

外文关键词：Hurricanes - Storms - Weather forecasting

外文摘要：In order to explore the impacts of nonuniform vertical resolution on the forecasting of typhoons, using the Weather Research and Forecasting (WRF) numerical model based on an example of the Super Typhoon Lekima (1909) occurred over the western Pacific on July 29, 2019 (UTC) east of the Philippines, three experiments have been designed including the vertical resolution enhancements in low, middle and high model layer, respectively. The results show firstly that the changes in vertical resolution have a relatively small impact on typhoon track simulation but a significant impact on intensity simulation. Increasing the vertical resolution in the low layer improves significantly the simulation of typhoon intensity. Secondly, in terms of the dynamic structure simulation, refining the low layer results in stronger inflow activity, more uniform distributed convergence and upward transport, higher symmetry of convection, smaller tilt angle of the eyewall, and more uniform circular distribution of the eyewall around the low-pressure center compared with refinement in the middle and high layer. Finally, in terms of the thermal structure simulation, all three enhancement schemes can improve the warm core height of the typhoon, but only refinement in the low layer can enhance the strength and symmetry of the warm core. That is because high-entropy air sinks evenly in all four quadrants, and the distribution of pseudo-equivalent potential temperature and surface heat flux are both relatively symmetric. The highly symmetric heating increases the strength of the warm core, thereby improving the intensity simulation of the typhoon. ? 2023, The Authors. All rights reserved.