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首页> 外文期刊>Tellus. A >Evaluation of several different planetary boundary layer schemes within a single model, a unified model and a multimodel superensemble
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Evaluation of several different planetary boundary layer schemes within a single model, a unified model and a multimodel superensemble

机译：在单个模型，统一模型和多模型超级集合中评估几种不同的行星边界层方案

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This paper addresses the forecasts of latent heat fluxes from five different formulations of the planetary boundary layer (PBL). Different formulations are deployed within the Florida State University global spectral model. Hundreds of short range forecast experiments are carried out using daily data sets for summer 2002 with each model. The primary goal of this study is to compare the performance of the diverse family of PBL algorithms for the latent heat fluxes within the PBL. Benchmark fluxes are calculated from the vertical integrals of Yanai's formulation of the apparent moisture sink and a precipitation using Physical Initialization. This provides indirectly observed estimates of the vertical fluxes of latent heat in the PBL. This comparison reveals that no single scheme shows a global spread of improvement over other models for forecasts of latent heat fluxes in the PBL. Among these diverse models the turbulent kinetic energy based closure provides somewhat better results. The construction of a multimodel superensemble provides a synthesis of these different PBL formulations and shows improved forecasts of the surface fluxes. A single unified model utilizing weighted PBL algorithms where all the five schemes are retained within a single model shows some promise for improving a single model.
机译：本文介绍了来自行星边界层（PBL）五个不同公式的潜热通量预测。在佛罗里达州立大学全球光谱模型中部署了不同的公式。每个模型使用2002年夏季的每日数据集进行了数百次短程预报实验。这项研究的主要目的是针对PBL内的潜热通量比较各种PBL算法系列的性能。基准通量是由Yanai的表观水分汇公式和垂直分布的物理积分的垂直积分计算得出的。这可以间接观察到PBL中潜热的垂直通量估计值。这种比较表明，没有一个方案能比其他模型显示出在PBL中潜在潜热通量预测方面的改进在全球范围内的扩展。在这些不同的模型中，基于湍动能的闭合提供了更好的结果。多模型超级集合的构建提供了这些不同PBL公式的综合，并显示了对表面通量的改进预测。使用加权PBL算法的单个统一模型（其中所有五个方案都保留在单个模型中）显示了改进单个模型的一些希望。

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