高分辨率模式中积云参数化方案对模拟台风“凡亚比”的影响

在高水平分辨率模式(3～6 km)中,对于是否应该再使用积云参数化方案,仍存在着争论.为此,利用WRF模式,在5 km水平分辨率下,研究了不同云降水方案对一次台风过程模拟的影响,并对影响原因进行了初步探索.结果表明,即使在5 km高水平分辨率下,使用积云参数化方案仍能有效改善对台风路径的模拟,同时,成熟的混合冰相微物理方案对模拟台风路径也非常重要；对台风强度模拟,对积云参数化方案的选择较为敏感和复杂；在48 h预报时效内,只使用微物理方案模拟的降水较好,使用积云参数化方案容易产生较多的虚假降水,但能改善第3天24 h累积降水模拟.这些研究结果为利用高水平分辨率模式模拟台风和改进积云参数化方案提供一定借鉴.

Impact of Cumulus Parameterization Schemes on Simulation of Fanapi Hurricane Using High Resolution Model

In the high resolution model (6 to 3 km), there are still controversies for using the cumulus parameterization scheme. The impact of using different cloud precipitation schemes on the simulation of a hurricane is studied by using the WRF model at a grid spacing of 5 km, and the causes of the impact are investigated. The results indicate that even in this high resolution, the cumulus parameterization scheme can improve the simulations of TC tracks. The sophisticated mixed ice phase schemes have the greater advantage of simulating the TC tracks than the simple mixing ice phase schemes. The simulation of TC intensity is sensitive to the choice of cumulus parameterization schemes. The best simulation of precipitation can be obtained by employing only the microphysics scheme. Using the cumulus parameterization scheme can cause more false rainfall, but improve the simulation of the third day precipitation. By affecting the simulations of the typhoon asymmetrical structure, the cumulus parameterizations can improve the simulations of TC tracks. These findings provide a reference for typhoon simulation by using the high resolution model and improve the cumulus parameterization scheme.