中文摘要：

本文利用中尺度数值模式WRF，分别采用YSU和MYJ两种边界层参数化方案对2010年超强台风Megi的移动路径进行了模拟，研究了热带气旋（Tc）路径模拟对边界层方案的敏感性，并从模拟TC尺度差异所造成的影响角度揭示了模式边界层方案影响TC路径的机理．结果表明：由于两种方案对边界层垂直混合作用过程的描述不同，两个试验模拟的低层水汽垂直输送存在差异．相对于能很好模拟出Megi路径的MYJ方案，YSU方案模拟的TC外围螺旋雨带更活跃，造成TC尺度增大，引起TC中心北侧外围气压梯度和径向风速增加，使得由副高向Tc中心输送更多的质量，造成副高异常减弱，从而导致由副高主导的引导气流发生改变，最终使得采用YSu方案模拟的Megi路径出现提前转向．

英文摘要：

The WRF model was employed to conduct the simulations for super typhoon Megi （2010） with YSU and MYJ planetary boundary layer （PBL） scheme respectively. The sensitivity of the simulated tropical cyclone （TC） track to the PBL scheme was investigated, and the mechanism of the PBL scheme influencing TC track simulation from the viewpoint of TC scale was analyzed. The results show that the description of the vertical mixing process with different scheme causes the difference of simulated lower-level water vapor vertical transportation. Relative to the MYJ scheme, which can reproduce the Megi track well, the simulation with YSU scheme will make more active outer spiral rainbands and magnify TC size. Accordingly, the intensive outer pressure gradient and radial wind will make more air mass transportation from western Pacific subtropical high （WPSH） to TC, which will lead to the weakening of WPSH as well as the steering flow. As a result, the simulation with YSU scheme will cause TC turns northward ahead of time.