MESOSCALE SIMULATION OF A HEAVY RAINFALL IN THE HUAIHE RIVER VALLEY IN JULY 2003: EFFECTS OF DIFFERENT HORIZONTAL RESOLUTIONS
MESOSCALE SIMULATION OF A HEAVY RAINFALL IN THE HUAIHE RIVER VALLEY IN JULY 2003: EFFECTS OF DIFFERENT HORIZONTAL RESOLUTIONS
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发表时间：
2012
影响因子：
1.2
通讯作者：
Yan Zhi-hui
中科院分区：
文献类型：
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作者：
Yan Zhi-hui
利用不同水平分辨率和物理参数化方案的WRF模式，对2003年7月上旬（1 ~ 11日）淮河流域一次异常长时间暴雨过程进行了数值模拟试验，研究了水平分辨率对模式性能的影响。本文重点研究了分辨率对模拟结果的影响，并对不同分辨率下的模拟结果进行了比较（45公里、30公里、20公里和10公里）和观测资料表明，模式基本合理地再现了降水带、不同时段的环流特征，随着水平分辨率的提高，降雨模拟的性能显著提高，模式低层风场的模拟误差都具有波动性，并同时向高层传播。
Numerical simulation experiments have been conducted with the Weather Research and Forecast(WRF) model with different horizontal resolutions and physical parameterization schemes to investigate the effects of resolution on the model performances in reproducing a abnormally prolonged heavy rainfall process in the Huaihe river valley in early July 2003(1st—11th). This paper focuses on the resolution impact on the simulation results.The comparisons between the model results with different resolutions(45 km,30 km,20 km and 10 km) and observations have indicated that the model has a basic and reasonable reproduction of the rainfall belt,the circulation characteristics over different periods,as well as the regional mean variables.The performance of rainfall simulation improves significantly with increased horizontal resolution,but that of circulation modeling is not affected as much.The errors of modeled wind in the model low levels all have the characteristics of fluctuation and propagate to the upper lever at the same time.