globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015MS000508
Scopus记录号: 2-s2.0-84953775181
论文题名:
Analysis of pressure-strain and pressure gradient-scalar covariances in cloud-topped boundary layers: A large-eddy simulation study
作者: Heinze R; , Mironov D; , Raasch S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期:1
起始页码: 3
结束页码: 30
语种: 英语
英文关键词: Atmospheric thermodynamics ; Boundary layer flow ; Boundary layers ; Budget control ; Buoyancy ; Pressure gradient ; Reynolds equation ; Reynolds number ; Shear flow ; Turbulence ; Uncertainty analysis ; Cloud-topped boundary layer ; Comparison of models ; Geophysical applications ; Nocturnal marine stratocumulus ; Parameterizations ; Second orders ; Shear contribution ; Turbulence interactions ; Large eddy simulation ; boundary layer ; buoyancy ; cloud cover ; Coriolis force ; large eddy simulation ; pressure gradient ; stratocumulus ; trade wind ; turbulence ; velocity
英文摘要: A detailed analysis of the pressure-scrambling terms (i.e., the pressure-strain and pressure gradient-scalar covariances) in the Reynolds-stress and scalar-flux budgets for cloud-topped boundary layers (CTBLs) is performed using high-resolution large-eddy simulation (LES). Two CTBLs are simulated - one with trade wind shallow cumuli, and the other with nocturnal marine stratocumuli. The pressure-scrambling terms are decomposed into contributions due to turbulence-turbulence interactions, mean velocity shear, buoyancy, and Coriolis effects. Commonly used models of these contributions, including a simple linear model most often used in geophysical applications and a more sophisticated two-component-limit (TCL) nonlinear model, are tested against the LES data. The decomposition of the pressure-scrambling terms shows that the turbulence-turbulence and buoyancy contributions are most significant for cloud-topped boundary layers. The Coriolis contribution is negligible. The shear contribution is generally of minor importance inside the cloudy layers, but it is the leading-order contribution near the surface. A comparison of models of the pressure-scrambling terms with the LES data suggests that the more complex TCL model is superior to the simple linear model only for a few contributions. The linear model is able to reproduce the principal features of the pressure-scrambling terms reasonably well. It can be applied in the second-order turbulence modeling of cloud-topped boundary layer flows, provided some uncertainties are tolerated. © 2015. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75927
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Institut für Meteorologie und Klimatologie, Leibniz Universität Hannover, Hannover, Germany; Max Planck Institut, Atmosphäre im Erdsystem, Hamburg, Germany; Deutscher Wetterdienst, Forschung und Entwicklung, FE14, Offenbach, Germany

Recommended Citation:
Heinze R,, Mironov D,, Raasch S. Analysis of pressure-strain and pressure gradient-scalar covariances in cloud-topped boundary layers: A large-eddy simulation study[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(1)
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