A New Second-Order Turbulence Closure Scheme for the Planetary Boundary Layer

A New Second-Order Turbulence Closure Scheme for the Planetary Boundary Layer
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一种新的行星边界层二阶湍流闭合方案

DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
N. McFarlane
N. McFarlane
中科院分区：
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文献类型：
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作者：
K. Abdella;N. McFarlane

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本文提出了一种新的行星边界层湍流格式，并与干边界层的大涡模拟（LES）进行了比较。新方案包含一个湍流动能预报方程。其他二阶矩诊断确定通过参数化的三阶矩是基于对流质量通量参数。对于热通量，这导致一个非局部的制定与通常的下梯度项和反梯度项。反梯度项原来是一个组合的良好建立的公式与一个额外的新的术语。新方案的性能进行了测试，在各种无云边界层条件下，通过比较相应的LES模拟的结果。该方案能够准确地再现LES的平均结果以及湍流量，包括三阶矩。
A new turbulence formulation for the planetary boundary layer (PBL) is presented and compared with largeeddy simulations (LES) for the dry PBL. The new scheme contains a prognostic equation for the turbulent kinetic energy. Other second-order moments are determined diagnostically through a parameterization of the third-order moments that is based on a convective mass-flux argument. For the heat flux this leads to a nonlocal formulation with the usual down-gradient term and a counter-gradient term. The counter-gradient term turns out to be a combination of well-established formulations with an additional new term. The performance of the new scheme is tested in a variety of cloud-free PBL conditions by comparing the results with corresponding LES simulations. The scheme is able to accurately reproduce the LES results of the mean as well as the turbulent quantities including third moments.