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首页> 外文期刊>Pure and Applied Geophysics >The Sensitivity of Rainfall Characteristics to Cumulus Parameterization Schemes from a WRF Model. Part I: A Case Study Over East Africa During Wet Years
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The Sensitivity of Rainfall Characteristics to Cumulus Parameterization Schemes from a WRF Model. Part I: A Case Study Over East Africa During Wet Years

机译：从WRF模型中降雨特性对积云参数化方案的敏感性。 第一部分：在潮湿年份的东非案例研究

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摘要

The suitability of a weather research and forecasting model in simulating mean rainfall, number of rainy days (NRDs), intensity of rainy days and their frequencies is investigated over East Africa for selected wet years. Physical cumulus parameterizations using Kain-Fritsch (KF), Kain-Fritsch with a moisture advection-based trigger function (KFT), Grell-Devenyi (GRELL) and Betts-Miller-Janjic (BML) schemes were investigated. Results show that the schemes reproduce the general pattern of observed mean rainfall with reasonable accuracy; KF and GRELL schemes were more sensitive to simulations of rainfall characteristics. The KF (GRELL) simulations characteristically were associated with excess (deficient) rainfall. The BML scheme simulated a double signal of wet and dry rainfall biases. The KF and GRELL schemes simulated too many (fewer) NRDs under light (heavy) rainfall categories. Using a moisture advection function in the KFT scheme potentially lowered the excess rainfall simulated in the KF scheme. The reduced wet bias in simulated rainfall is due to better explicit physical mechanism realism of the trigger function in the KF scheme. A coherent statistical difference between KF and GRELL schemes was noted. The findings provide a basis upon which researchers and forecasters can improve numerical weather systems for better forecasting and simulations of East Africa extreme rainfall characteristics.
机译：在模拟平均降雨中的天气研究和预测模型的适用性，雨天数（NRDS），雨天强度及其频率的含量为选定的潮湿年。研究了使用Kain-Fritsch（KF），Kain-Fritsch的物理积云参数化，具有基于水分的触发功能（KFT），Grell-Devenyi（Grell）和Betts-Miller-Janjic（BM1）方案进行了研究。结果表明，该方案再现了观察到的平均降雨的一般模式; KF和GRELL方案对降雨特征的模拟更敏感。 KF（GRELL）模拟特征性地与过量（不足）降雨相关。 BML方案模拟了湿润和干燥的降雨偏差的双信号。 KF和GRELL方案模拟轻（重）降雨类别下的太多（更少）NRD。在KFT方案中使用水分平流功能可能降低了KF方案中模拟的过度降雨。模拟降雨中的湿偏差降低是由于KF方案中的触发功能的更好的明确物理机制现实主义。注意到KF和GREL方案之间的相干统计差异。该调查结果提供了基础，研究人员和预测人员可以改善数字天气系统，以便更好地预测和东非极端降雨特征的模拟。

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