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中文摘要: 利用16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21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;模式下垫面特征分类的精确性对模式的预报结果有很大的影响。
中文关键词: η坐标，湍流，边界层，暴雨
Abstract: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.
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引用文本：
王康康,张维桓,张礼平,2003.η模式边界层方案的优化及其对暴雨的数值试验[J].气象,29(2):7-11.
,2003.The η Model with Improved PBL Scheme and Numerical Simulation of Heavy Rain[J].Meteor Mon,29(2):7-11.
王康康,张维桓,张礼平,2003.η模式边界层方案的优化及其对暴雨的数值试验[J].气象,29(2):7-11.
,2003.The η Model with Improved PBL Scheme and Numerical Simulation of Heavy Rain[J].Meteor Mon,29(2):7-11.