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A sensitivity study of Surface Wind simulations over Coastal Ghana to selected Time Control and Nudging options in the Weather Research and Forecasting Model

机译:加纳沿海地表风模拟对天气研究和预报模型中选定的时间控制和微调选项的敏感性研究

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摘要

Over the years, the Weather Research and Forecasting Model (WRF) has been gaining popularity as a low-cost alternative source of data for wind resource assessments. This paper investigates the impact of selected time control, and nudging options on wind simulations in WRF. We conducted 15 numerical experiments, combining 5 simulation run-times and 3 options for disabling nudging in the Planetary Boundary Layer (PBL) in WRF. Hourly wind speed and direction predictions were compared with actual measurements at 40 m, 50 m and 60 m a.g.l. From our results, we recommend that, for optimum performance, the method of disabling nudging in the PBL should be chosen with simulation run times in mind. For wind simulations in our study area, up to 2 days run-times with nudging disabled below 1600 m in model configurations gives the best wind speed predictions. However, disabling nudging below the model-calculated PBL height offers more consistent results and produces relatively less prediction error with longer run times.
机译:多年来,天气研究和预报模型(WRF)作为风资源评估的低成本替代数据来源而日益流行。本文研究了选定的时间控制以及微调选项对WRF中风模拟的影响。我们进行了15个数值实验,结合了5个模拟运行时和3个用于禁用WRF行星边界层(PBL)中的微调的选项。将每小时风速和风向预测值与40 m,50 m和60 m a.g.l的实际测量值进行了比较。从我们的结果中,我们建议为获得最佳性能,应考虑模拟运行时间来选择在PBL中禁用微调的方法。对于我们研究范围内的风向模拟,模型配置中长达1600天的运行时间长达2天,并且在模型配置中禁用了微调,可以提供最佳的风速预测。但是,禁用在模型计算的PBL高度以下的微调将提供更一致的结果,并且在较长的运行时间下产生相对较小的预测误差。

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