Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0186.1 |
On the Formulation and Universality of Monin-Obukhov Similarity Functions for Mean Gradients and Standard Deviations in the Unstable Surface Layer: Results from Surface-Layer-Resolving Large-Eddy Simulations | |
Maronga, Bjoern1; Reuder, Joachim2,3 | |
2017-04-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Norway |
英文摘要 | Surface-layer-resolving large-eddy simulations (LESs) of free-convective to near-neutral boundary layers are used to study Monin-Obukhov similarity theory (MOST) functions. The LES dataset, previously used for the analysis of MOST relationships for structure parameters, is extended for the mean vertical gradients and standard deviations of potential temperature, specific humidity, and wind. Also, local-free-convection (LFC) similarity is studied. The LES data suggest that the MOST functions for mean gradients are universal and unique. The data for the mean gradient of the horizontal wind display significant scatter, while the gradients of temperature and humidity vary considerably less. The LES results suggest that this scatter is mostly related to a transition from MOST to LFC scaling when approaching free-convective conditions and that it is associated with a change of the slope of the similarity functions toward the expected value from LFC scaling. Overall, the data show slightly, but consistent, steeper slopes of the similarity functions than suggested in literature. The MOST functions for standard deviations appear to be unique and universal when the entrainment from the free atmosphere into the boundary layer is sufficiently small. If entrainment becomes significant, however, we find that the standard deviation of humidity no longer follows MOST. Under free-convective conditions, the similarity functions should reduce to universal constants (LFC scaling). This is supported by the LES data, showing only little scatter, but displaying a systematic height dependence of these constants. Like for MOST, the LFC similarity constant for the standard deviation of specific humidity becomes nonuniversal when the entrainment of dry air reaches significant levels. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399333700003 |
WOS关键词 | LARGE-APERTURE SCINTILLOMETER ; ATMOSPHERIC BOUNDARY-LAYER ; STRUCTURE PARAMETERS ; DISSIPATION RATE ; FREE-CONVECTION ; TEMPERATURE ; FLUXES ; HEAT ; HUMIDITY ; WIND |
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/29397 |
专题 | 地球科学 |
作者单位 | 1.Leibniz Univ Hannover, Inst Meteorol & Klimatol, Hannover, Germany; 2.Univ Bergen, Geophys Inst, Bergen, Norway; 3.Bjerknes Ctr Climate Res, Bergen, Norway |
推荐引用方式 GB/T 7714 | Maronga, Bjoern,Reuder, Joachim. On the Formulation and Universality of Monin-Obukhov Similarity Functions for Mean Gradients and Standard Deviations in the Unstable Surface Layer: Results from Surface-Layer-Resolving Large-Eddy Simulations[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(4). |
APA | Maronga, Bjoern,&Reuder, Joachim.(2017).On the Formulation and Universality of Monin-Obukhov Similarity Functions for Mean Gradients and Standard Deviations in the Unstable Surface Layer: Results from Surface-Layer-Resolving Large-Eddy Simulations.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(4). |
MLA | Maronga, Bjoern,et al."On the Formulation and Universality of Monin-Obukhov Similarity Functions for Mean Gradients and Standard Deviations in the Unstable Surface Layer: Results from Surface-Layer-Resolving Large-Eddy Simulations".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.4(2017). |
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