| The Global Climate Model(GCM) is good at simulating the change of global climate. But its resolution is too low to make a reasonable analysis of the regional weather forecast. The large-scale climate information need to be downscaled to get the detailed description of high resolution of local region. At present, the application of downscaling have three categories: dynamic downscaling, statistical downscaling,and the combination of the above two methods. The dynamical downscaling is a method to obtain description information of higher temporal and spatial resolution,which is based on the dynamics equation with the initial and boundary conditions.Typhoons Vicente (1208) and Kalmaegi (1415) are successfully simulated by the mesoscale Weather Research and Forecasting (WRF) model using the NCEP(National Centers for Environmental Prediction) final operational global analysis data with the resolution of 1-degree by 1-degree grid. The results show that the simulated track and intensity of the typhoons are in consistence with JMA best track data. The simulated surface wind nearly coincides with the station observation.Sensitivity experiments are then carried out to test the impacts of the terrain and land surface characteristics in Hong Kong and Shenzhen on the wind in Shenzhen area.Based on the sensitivity tests, it is found that the wind influence on the Midwest Shenzhen induced by typhoons landing in western Guangdong is weakened by Hong Kong's terrain. Hong Kong plays a role of reducing and protecting the wind impact on Midwest Shenzhen from Typhoons moving westward. Furthermore, it is found the wind intensity in Yantian international container terminal is enhanced by the channel effect of WuTong Mountain in Shenzhen. |
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