NUMERICAL SIMULATION STUDY ON THE RAPID INTENSIFICATION OF TYPHOON HAIKUI(1211) OFF THE SHORE OF CHINA  

作　　者：ZHANG Sheng-jun QIAN Yan-zhen HUANG Yi-wu GUO Jian-min 张胜军;钱燕珍;黄奕武;郭建民(State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences;Ningbo Meteorological Observatory;National Meteorological Center)

机构地区：[1]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 China [2]Ningbo Meteorological Observatory, Ningbo 315012 China [3]National Meteorological Center, Beijing 100081 China

出　　处：《Journal of Tropical Meteorology》2017年第3期269-280,共12页热带气象学报（英文版）

基　　金：National Key Basic Research Program of China(2015CB452804);National Natural Science Foundation of China(41575063,41275066,41075037);Ningbo Science and Technology Project(2014C50024)

摘　　要：Forecasting the rapid intensification of tropical cyclones over offshore areas remains difficult. In this article,the Weather Research and Forecast(WRF) model was used to study the rapid intensification of Typhoon Haikui(1211)off the shore of China. After successful simulation of the intensity change and track of the typhoon, the model output was further analyzed to determine the mechanism of the rapid change in intensity. The results indicated that a remarkable increase in low-level moisture transportation toward the inner core, favorable large-scale background field with low-level convergence, and high-level divergence played key roles in the rapid intensification of Typhoon Haikui in which high-level divergence could be used as an indicator for the rapid intensity change of Typhoon Haikui approximately 6 h in advance. An analysis of the typhoon structure revealed that Typhoon Haikui was structurally symmetric during the rapid intensification and the range of the eyewall was small in the low level but extended outward in the high level. In addition, the vertically ascending motion, the radial and tangential along wind speeds increased with increasing typhoon intensity, especially during the process of rapid intensification. Furthermore, the intensity of the warm core of the typhoon increased during the intensification process with the warm core extending outward and toward the lower layer. All of the above structural changes contributed to the maintenance and development of typhoon intensity.Forecasting the rapid intensification of tropical cyclones over offshore areas remains difficult. In this article,the Weather Research and Forecast（WRF） model was used to study the rapid intensification of Typhoon Haikui（1211）off the shore of China. After successful simulation of the intensity change and track of the typhoon, the model output was further analyzed to determine the mechanism of the rapid change in intensity. The results indicated that a remarkable increase in low-level moisture transportation toward the inner core, favorable large-scale background field with low-level convergence, and high-level divergence played key roles in the rapid intensification of Typhoon Haikui in which high-level divergence could be used as an indicator for the rapid intensity change of Typhoon Haikui approximately 6 h in advance. An analysis of the typhoon structure revealed that Typhoon Haikui was structurally symmetric during the rapid intensification and the range of the eyewall was small in the low level but extended outward in the high level. In addition, the vertically ascending motion, the radial and tangential along wind speeds increased with increasing typhoon intensity, especially during the process of rapid intensification. Furthermore, the intensity of the warm core of the typhoon increased during the intensification process with the warm core extending outward and toward the lower layer. All of the above structural changes contributed to the maintenance and development of typhoon intensity.

关 键 词：TYPHOON rapid change of typhoon intensity structure change numerical simulation 

分 类 号：P444[天文地球—大气科学及气象学]