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DOI | 10.1175/JAS-D-18-0159.1 |
Modulation of Mean Wind and Turbulence in the Atmospheric Boundary Layer by Baroclinicity | |
Momen, Mostafa1,2; Bou-Zeid, Elie1; Parlange, Marc B.3; Giometto, Marco2 | |
2018-11-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:11页码:3797-3821 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Australia |
英文摘要 | This paper investigates the effects of baroclinic pressure gradients on mean flow and turbulence in the diabatic atmospheric boundary layer (ABL). Large-eddy simulations are conducted where the direction of the baroclinicity, its strength, and the surface buoyancy flux are systematically varied to examine their interacting effects. The thermal wind vector, which represents the vertical change in the geostrophic wind vector resulting from horizontal temperature gradients, significantly influences the velocity profiles, the Ekman turning, and the strength and location of the low-level jet (LLJ). For instance, cold advection and positive (negative) geostrophic shear increased (decreased) friction velocity and changed the LLJ elevation. Given the baroclinicity strength and direction under neutral conditions, a simple reduced model is proposed and validated here to predict the general trends of baroclinic mean winds. The baroclinic effects on turbulence intensity and structure are even more intricate, with turbulent kinetic energy (TKE) profiles displaying an increase of TKE magnitude with height for some cases. When a fixed destabilizing surface heat flux is added, a positive geostrophic shear favors streamwise aligned roll-type structures, which are typical of neutral ABLs. Conversely, a negative geostrophic shear promotes cell-type structures, which are typical of strongly unstable ABLs. Furthermore, baroclinicity increases shear in the outer ABL and tends to make the outer flow more neutral by decreasing the Richardson flux number. These findings are consequential for meteorological measurements and the wind-energy industry, among others: baroclinicity alters the mean wind profiles, the TKE, coherent structures, and the stability of the ABL, and its effects need to be considered. |
英文关键词 | Baroclinic flows Ekman pumping transport Turbulence Boundary layer Wind Large eddy simulations |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448512700002 |
WOS关键词 | LARGE-EDDY SIMULATION ; APPROXIMATE ANALYTICAL SOLUTION ; EKMAN-LAYER ; COMPLEX TERRAIN ; SCALE ENERGY ; MODELS ; UNSTEADY ; INVERSION ; PROFILES ; PRESSURE |
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/29742 |
专题 | 地球科学 |
作者单位 | 1.Princeton Univ, Dept Civil & Environm Engn, Princeton, NJ 08544 USA; 2.Columbia Univ, Dept Civil Engn & Engn Mech, New York, NY 10027 USA; 3.Monash Univ, Dept Civil Engn, Melbourne, Vic, Australia |
推荐引用方式 GB/T 7714 | Momen, Mostafa,Bou-Zeid, Elie,Parlange, Marc B.,et al. Modulation of Mean Wind and Turbulence in the Atmospheric Boundary Layer by Baroclinicity[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(11):3797-3821. |
APA | Momen, Mostafa,Bou-Zeid, Elie,Parlange, Marc B.,&Giometto, Marco.(2018).Modulation of Mean Wind and Turbulence in the Atmospheric Boundary Layer by Baroclinicity.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(11),3797-3821. |
MLA | Momen, Mostafa,et al."Modulation of Mean Wind and Turbulence in the Atmospheric Boundary Layer by Baroclinicity".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.11(2018):3797-3821. |
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