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DOI | 10.1175/JAS-D-18-0149.1 |
An Improved Double-Gaussian Closure for the Subgrid Vertical Velocity Probability Distribution Function | |
Fitch, A. C.1,2,3 | |
2019 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:1页码:285-304 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; USA |
英文摘要 | The vertical velocity probability distribution function (PDF) is analyzed throughout the depth of the lower atmosphere, including the subcloud and cloud layers, in four large-eddy simulation (LES) cases of shallow cumulus and stratocumulus. Double-Gaussian PDF closures are examined to test their ability to represent a wide range of turbulence statistics, from stratocumulus cloud layers characterized by Gaussian turbulence to shallow cumulus cloud layers displaying strongly non-Gaussian turbulence statistics. While the majority of the model closures are found to perform well in the former case, the latter presents a considerable challenge. A new model closure is suggested that accounts for high skewness and kurtosis seen in shallow cumulus cloud layers. The well-established parabolic relationship between skewness and kurtosis is examined, with results in agreement with previous studies for the subcloud layer. In cumulus cloud layers, however, a modified relationship is necessary to improve performance. The new closure significantly improves the estimation of the vertical velocity PDF for shallow cumulus cloud layers, in addition to performing well for stratocumulus. In particular, the long updraft tail representing the bulk of cloudy points is much better represented and higher-order moments diagnosed from the PDF are also greatly improved. However, some deficiencies remain owing to fundamental limitations of representing highly non-Gaussian turbulence statistics with a double-Gaussian PDF. |
英文关键词 | Turbulence Boundary layer Cloud parameterizations Clouds Large eddy simulations |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000454763100003 |
WOS关键词 | CONVECTIVE BOUNDARY-LAYER ; LARGE-EDDY SIMULATION ; DENSITY-FUNCTIONS ; SHALLOW CUMULUS ; UNIFIED PARAMETERIZATION ; MARINE STRATOCUMULUS ; TURBULENCE CLOSURE ; CLOUD MICROPHYSICS ; 3RD-ORDER MOMENTS ; MODEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29265 |
专题 | 地球科学 |
作者单位 | 1.Stockholm Univ, Dept Meteorol, Stockholm, Sweden; 2.Pacific Northwest Natl Lab, Richland, WA 99352 USA; 3.Bolin Ctr Climate Res, Stockholm, Sweden |
推荐引用方式 GB/T 7714 | Fitch, A. C.. An Improved Double-Gaussian Closure for the Subgrid Vertical Velocity Probability Distribution Function[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(1):285-304. |
APA | Fitch, A. C..(2019).An Improved Double-Gaussian Closure for the Subgrid Vertical Velocity Probability Distribution Function.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(1),285-304. |
MLA | Fitch, A. C.."An Improved Double-Gaussian Closure for the Subgrid Vertical Velocity Probability Distribution Function".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.1(2019):285-304. |
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