高级检索
王丹, 余贞寿. 2023. 公里尺度分辨率WRF模拟梅雨暴雨对积云对流参数化的敏感性试验研究[J]. 大气科学, 47(6): 1876−1890. doi: 10.3878/j.issn.1006-9895.2203.21259
引用本文: 王丹, 余贞寿. 2023. 公里尺度分辨率WRF模拟梅雨暴雨对积云对流参数化的敏感性试验研究[J]. 大气科学, 47(6): 1876−1890. doi: 10.3878/j.issn.1006-9895.2203.21259
WANG Dan, YU Zhenshou. 2023. Effect of Cumulus Parameterization Schemes on the High-Resolution Numerical Simulation of Heavy Meiyu Front Rainfall Events [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(6): 1876−1890. doi: 10.3878/j.issn.1006-9895.2203.21259
Citation: WANG Dan, YU Zhenshou. 2023. Effect of Cumulus Parameterization Schemes on the High-Resolution Numerical Simulation of Heavy Meiyu Front Rainfall Events [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(6): 1876−1890. doi: 10.3878/j.issn.1006-9895.2203.21259

公里尺度分辨率WRF模拟梅雨暴雨对积云对流参数化的敏感性试验研究

Effect of Cumulus Parameterization Schemes on the High-Resolution Numerical Simulation of Heavy Meiyu Front Rainfall Events

  • 摘要: 本文利用中尺度模式WRF V4.0.2(Weather Research and Forecasting Model,Version 4.0.2)对浙江省两次梅雨锋暴雨过程进行数值模拟,分别选用WSM6和Thompson云微物理方案、YSU和MYJ边界层方案、以及11种对流参数化方案进行试验,探究不同积云对流参数化方案对梅雨锋暴雨的1 km高分辨率预报的影响,结果表明:(1)在对各试验的降水预报评估过程中,使用传统点对点方法和邻域法都能客观表现出各试验的预报水平,而邻域检验法能更客观地评估模式对小范围强降水的预报水平。(2)三类积云对流方案(包括:无积云对流方案、传统积云对流方案和尺度自适应积云对流方案)都能较好地模拟出小雨降水的发生情况,但随着降水强度增强至暴雨、大暴雨量级时,尺度自适应的积云对流方案对降水的预报结果有明显改善。(3)在不同微物理和边界层组合方案下,尺度自适应积云对流方案的模拟结果差异更显著,而传统积云对流方案的模拟结果的效果差异不明显。(4)在1~10 km的“灰色区域”范围内,当网格分辨率逐渐提高到1 km时,尺度自适应积云对流方案较传统积云对流方案对模式的预报结果有明显的改善。本研究的结果在一定程度上可为高精度业务预报工作中对尺度自适应积云对流参数化方案的应用提供参考。

     

    Abstract: This study employed the Weather Research and Forecasting Model (WRF), Version 4.0.2, to simulate two Meiyu front precipitation processes in Zhejiang Province. Comparative analyses were performed using two microphysics schemes: the WRF Single-Moment 6-class (WSM6) and the Thompson schemes, two boundary layer schemes: the Yonsei University boundary layer scheme (YSU) and the Mellor-Yamada-Janjic (MYJ) schemes, and eleven cumulus convective parameterization schemes to investigate the influence of different schemes on the Meiyu front precipitation forecast. The results were as follows. (1) In the process of precipitation forecast evaluation for each experiment, both traditional methods (P2P and G2G) and the neighborhood method can objectively reveal the prediction level of each experiment. However, the neighborhood method conducts a more objective evaluation of the prediction level for small-scale heavy precipitation. (2) Three types of cumulus convection solutions, namely no cumulus, traditional cumulus, and scale-aware cumulus convections, can better simulate the light precipitation; however, with the intensification of precipitation due to rainstorms and heavy rainstorms, the scale-aware cumulus convection schemes significantly improve the forecast outcomes. (3) Under different microphysics and boundary layer combination schemes, the differences of simulation results of the scale-aware cumulus convection schemes were more significant than that of the traditional cumulus convection schemes. (4) Compared with the traditional cumulus convection scheme, the scale-aware cumulus convection scheme can considerably improve the prediction results of the model when the grid resolution is increased to 1 km in the gray zone range of 1–10 km. The results of this study can serve as a reference to some extent for the application of scale-aware convective parameterization schemes in high-precision operational forecasting.

     

/

返回文章
返回