مورد إلكتروني
Analysis of pressure-strain and pressure gradient-scalar covariances in cloud-topped boundary layers: A large-eddy simulation study
| العنوان: | Analysis of pressure-strain and pressure gradient-scalar covariances in cloud-topped boundary layers: A large-eddy simulation study |
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| بيانات النشر: | Hoboken, NJ : Blackwell Publishing Ltd 2016 |
| تفاصيل مُضافة: | Heinze, Rieke Mironov, Dmitrii Raasch, Siegfried |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | 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. |
| مصطلحات الفهرس: | cloud-topped boundary layers, large-eddy simulation, parameterizations, pressure-scrambling terms, second-order turbulence modeling, 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, Article, Text |
| URL: | Journal of Advances in Modeling Earth Systems 8 (2016), Nr. 1 1942-2466 |
| الإتاحة: | Open access content. Open access content https://creativecommons.org/licenses/by-nc-nd/4.0 CC BY-NC-ND 4.0 Unported |
| ملاحظة: | English |
| أرقام أخرى: | DELUH oai:www.repo.uni-hannover.de:123456789/759 Heinze, Rieke; Mironov, D.; Raasch, Siegfried: Analysis of pressure-strain and pressure gradient-scalar covariances in cloud-topped boundary layers: A large-eddy simulation study. In: Journal of Advances in Modeling Earth Systems 8 (2016), Nr. 1, S. 3-30. DOI: http://dx.doi.org/10.1002/2015MS000508 1372064018 |
| المصدر المساهم: | LEIBNIZ UNIVERSIT From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1372064018 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |