陆地摩擦对登陆热带气旋路径和强度影响的模拟研究

A SIMULATION STUDY OF THE INFLUENCE OF LAND FRICTION ON LANDFALL TROPICAL CYCLONE TRACK AND INTENSITY

采用准地转正压涡度方程模式,对地形强迫和陆地摩擦作用下登陆热带气旋的路径和强度进行了模拟研究。模拟结果表明:在考虑地形摩擦耗散作用时,热带气旋可能出现路径的突然偏折;在热带气旋强度比较弱而陆地摩擦作用比较强的情况下,热带气旋路径容易发生突然偏折,且其强度的突然变化不明显;陆地摩擦作用可能是造成登陆前后热带气旋路径突然偏折的一个重要因素。

A quasi-geostrophic barotropic vorticity equation model is used to simulate the influences of topographic forcing and land friction on landfall tropical cyclone track and intensity. The simulation results show that tropical cyclone track may have sudden deflection when the action of topographic friction dissipation is considered, and the sudden deflection of the track is easy to happen when the intensity of tropical cyclone is weak and the land friction is strong, and the sudden change of tropical cyclone intensity is not clear. The land friction may be an important factor that causes sudden deflection of tropical cyclone track around landfall.