不同边界层参数化方案在暴雨数值模拟中的对比分析  

Comparison Analysis of Different Boundary Layer Parameterization Schemes in the Numerical Simulation of Torrential Rain

作　　者：蔡蕊 王和权 王伟良 毛绍荣 

机构地区：[1]增城市气象局,广州增城511300

出　　处：《广东气象》2005年第1期6-8,共3页Guangdong Meteorology

摘　　要：本文利用非静力平衡的中尺度模式 (MM5 ) ,通过对一次华南锋前暖区暴雨的数值模拟 ,比较了 3种边界层参数化方案的作用。结果表明 :从 2 4小时累积降水的分布来看 ,MRF方案的预报与实况对比效果最好 ,其次是Blackadar高分辨率PBL模式 ,最差是noPBL方案。分析MRF方案的输出结果 ,发现对应每个时刻的累积雨团上空 ,92 5hPa都有较强的辐合辐散偶极子与之相配合 ,而在 3 0 0hPa则有较强的辐散。不同边界层方案模拟的辐散场有一定的差别 ,导致了降水的不同预报效果。A nonhydro-static meso-scale model (MM5) was used for the numerical simulation of a South China torrential rain event in warm sector before cold front. Three different boundary layer parameterization schemes were introduced for a comparison. The result shows that, in terms of 24-hour accumulative rainfall distribution, MRF scheme is the best, followed by Blackadar high resolution PBL model, while 'no PBL' scheme is poor. By studying the output of the MRF scheme, we found that at each time above the rain cluster, correspondingly, there was a pair of relatively strong dipoles of convergence and divergence at the level of 925 hPa, while strong divergence at 300 hPa. With different boundary layer schemes, the simulated divergence fields differ, which affects the performance of the rainfall forecast.

关 键 词：参数化方案 暴雨 降水 非静力 辐合辐散 雨团 预报效果 对比分析 配合 PBL模式 

分 类 号：P458.121.1[天文地球—大气科学及气象学] P456.7