WRF模式分辨率对新疆异常降雨天气要素模拟的影响

利用新一代中尺度气候数值模式WRF对中国西北干旱典型地区——新疆2000年10月的异常降雨事件进行模拟，主要研究了不同水平分辨率、垂直分辨率以及不同积云参数化过程对气温、降雨和土壤温度模拟的影响。结果表明：不同分辨率的模拟基本上均模拟出了地面气温的分布特征，且随着水平分辨率的提高，模式模拟能力显著提高，对地面气温值、分布范围的模拟渐趋合理，同时模式对于地形引起的温度分布变化的模拟更加趋近实际。水平分辨率、垂直分辨率的提高同样改善了模式对降水的模拟能力，分辨率的提高不仅改进了模式对降雨分布区模拟的精度，也增强了对于地形引起的降雨变异的模拟能力。在土壤温度模拟上，不同分辨率的试验均能模拟出土壤温度的分布特征，较高水平分辨率有利于描述土壤温度分布细节，但更容易出现“数值点风暴”现象。

Effect of Horizontal and Vertical Resolution on WRF Simulation of the Unusual Rainfall Event in Xinjiang

The Weather Research and Forecasting Model (WRF) is used to simulate unusual rainfall event over Xinjiang during 5-7 October 2000, and the effects of model's horizontal and vertical resolution on the unusual weather events are investigated in detail. In principle, the model is able to characterize the spatial distribution of unusual weather. The results indicate that the increase in horizontal resolution could reduce the bias of the modeled surface temperature and precipitation. A finer vertical resolution ...