Parameterization of Entrainment in a Sheared Convective Boundary Layer Using a First-order Jump Model
Parameterization of Entrainment in a Sheared Convective Boundary Layer Using a First-order Jump Model
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DOI：
10.1007/s10546-006-9067-3
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发表时间：
2006-06
影响因子：
4.3
通讯作者：
Siyun Kim;Soon-Ung Park;D. Pino;J. Arellano
中科院分区：
文献类型：
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作者：
Siyun Kim;Soon-Ung Park;D. Pino;J. Arellano
通过假定逆温层具有有限的深度，即，一阶跳跃模型大涡模拟数据被用来确定参数化的卷吸方程中所涉及的常数。基于从表面到CBL顶部的积分湍流动能收支，由表面热通量归一化得到的卷吸热通量是逆温层深度、穿过逆温层的速度跳跃、摩擦速度和对流速度的函数。用两个独立的反演强度不同的个例的大涡模拟资料对一阶跃模式进行了检验。在这两种情况下，模式再现相当合理的CBL高度，虚拟位温，速度分量的混合层和逆温层的演变。
Basic entrainment equations applicable to the sheared convective boundary layer (CBL) are derived by assuming an inversion layer with a finite depth, i.e., the first-order jump model. Large-eddy simulation data are used to determine the constants involved in the parameterizations of the entrainment equations. Based on the integrated turbulent kinetic energy budget from surface to the top of the CBL, the resulting entrainment heat flux normalized by surface heat flux is a function of the inversion layer depth, the velocity jumps across the inversion layer, the friction velocity, and the convection velocity. The developed first-order jump model is tested against large-eddy simulation data of two independent cases with different inversion strengths. In both cases, the model reproduces quite reasonably the evolution of the CBL height, virtual potential temperature, and velocity components in the mixed layer and in the inversion layer.