An Integrated Turbulence Scheme for Boundary Layers with Shallow Cumulus Applied to Pollutant Transport
An Integrated Turbulence Scheme for Boundary Layers with Shallow Cumulus Applied to Pollutant Transport
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应用于污染物输送的浅积云边界层综合湍流方案
DOI：
10.1175/jam2284.1
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
W. Angevine
中科院分区：
文献类型：
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作者：
W. Angevine
摘要本文介绍了一个完整描述有浅积云的自由对流边界层湍流输送的方案。该计划使用的质量通量公式，是常见的积云方案，和1.5阶封闭，涉及湍流动能和涡扩散。这两个组件在子云和云图层中都处于活动状态。该方案被称为“质量通量扩散”。在云下层，质量通量分量提供了非本地传输。该计划结合了概念上相似但细节上不同的计划的内容。卷吸羽流模型被用来找到的质量通量。质量通量是连续通过云底的。横向分数夹带率是恒定的高度，而除雾率剖面减少的质量通量顺利地在云顶为零。涡动扩散系数来自湍流动能-长度尺度公式。该方案已在一个简单的一维（单列…
Abstract A scheme is described that provides an integrated description of turbulent transport in free convective boundary layers with shallow cumulus. The scheme uses a mass-flux formulation, as is commonly found in cumulus schemes, and a 1.5-order closure, involving turbulent kinetic energy and eddy diffusivity. Both components are active in both the subcloud and cloud layers. The scheme is called “mass flux–diffusion.” In the subcloud layer, the mass-flux component provides nonlocal transport. The scheme combines elements from schemes that are conceptually similar but differ in detail. An entraining plume model is used to find the mass flux. The mass flux is continuous through the cloud base. The lateral fractional entrainment rate is constant with height, while the detrainment-rate profile reduces the mass flux smoothly to zero at the cloud top. The eddy diffusivity comes from a turbulent kinetic energy–length scale formulation. The scheme has been implemented in a simple one-dimensional (single column...