CLUBB as a unified cloud parameterization: Opportunities and challenges
CLUBB as a unified cloud parameterization: Opportunities and challenges
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DOI：
10.1002/2015gl063672
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发表时间：
2015-06-16
影响因子：
5.2
通讯作者：
Ginoux, P.
中科院分区：
文献类型：
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作者：
Guo, H.;Golaz, J. -C.;Ginoux, P.
CLUBB（双法线统一云层）是一种高阶闭合 (HOC) 方法，具有针对垂直速度、温度和湿度的子网格变化的假设联合概率密度函数 (PDF)。 CLUBB 已在地球物理流体动力学实验室大气环流模型 AM3-CLUBB 的大气组件 (AM3) 中实施，并成功统一了浅对流、解析云和行星边界层 (PBL) 的处理。在本研究中，我们进一步探讨了 CLUBB 在称为 AM3-CLUBB+ 的新配置中统一深层对流的可能性。讨论了指定海面温度的 AM3-CLUBB+ 模拟。云、辐射和降水场与观测和重新分析相比具有优势。 AM3-CLUBB+ 成功捕获了从层积云到深层对流的转变以及液态水路径对气溶胶的调制响应。对热带变率和马登-朱利安振荡 (MJO) 的模拟也得到了改进。缺陷包括热带水蒸气过多和中纬度地区冰云不足。
CLUBB (Cloud Layers Unified by Binormals) is a higher-order closure (HOC) method with an assumed joint probability density function (PDF) for the subgrid variations in vertical velocity, temperature, and moisture. CLUBB has been implemented in the atmospheric component (AM3) of the Geophysical Fluid Dynamics Laboratory general circulation model AM3-CLUBB and successfully unifies the treatment of shallow convection, resolved clouds, and planetary boundary layer (PBL). In this study, we further explore the possibility for CLUBB to unify the deep convection in a new configuration referred as AM3-CLUBB+. AM3-CLUBB+ simulations with prescribed sea surface temperature are discussed. Cloud, radiation, and precipitation fields compare favorably with observations and reanalyses. AM3-CLUBB+ successfully captures the transition from stratocumulus to deep convection and the modulated response of liquid water path to aerosols. Simulations of tropical variability and the Madden-Julian oscillation (MJO) are also improved. Deficiencies include excessive tropical water vapor and insufficient ice clouds in the midlatitudes.