η模式边界层方案的优化及其对暴雨的数值试验  

The η Model with Improved PBL Scheme and Numerical Simulation of Heavy Rain

作　　者：王康康 张维桓[2] 张礼平[3] 

机构地区：[1]南京空军司令部气象中心,南京210018 [2]解放军理工大学气象学院 [3]湖北省气象局气候中心

出　　处：《气象》2003年第2期7-12,共6页Meteorological Monthly

摘　　要：利用 1 6层垂直不等距MEM ,引入高分辨边界层方案 ,将模式垂直分层增加至2 1层 ,并将改进后的模式用于暴雨的数值模拟。结果表明 :改进后的模式对降水的预报特别是暴雨的预报有了很大的改进 ,其降水场的预报TS评分、特别是暴雨TS评分明显高于以前的模式 ,这对模式进一步的业务化具有重要意义。敏感性试验表明 :提高模式的垂直分辨率有益于暴雨预报水平的提高。模式对混合长和湿有效率较为敏感 ;Based on the Mesoscale Eta coordinate Model (MEM), which contains 16 levels in the vertical with different intervals, a high resolution PBL scheme with 21 levels is introducted. Using the improved model, the numerical simulations of heavy rain case are done. The results show that the improved model has a great progress in the heavy rain forecast, the TS score for the precipitation, especially, for the heavy rain, is obviously higher than the former model. This is very important in the model′s operational use in the near future. The sensitivity test shows that it is useful for the heavy rain forecast with increasing the model′s vertical resolution. Additionally, the model is sensitive with the mixing length and the moist available quotiety, and influence of the features of model underlying on the prediction results is important.

关 键 词：Η模式 边界层 暴雨 数值试验 降水预报 下垫面 

分 类 号：P457.6[天文地球—大气科学及气象学] P435