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DOI	10.1016/j.atmosres.2021.105634
	Study on the characteristics of the pressure fluctuations and their contribution to turbulence kinetic energy
	Wei Z.; Zhang H.; Ren Y.; Li Q.; Cai X.; Song Y.; Kang L.
发表日期	2021
ISSN	0169-8095
卷号	258
英文摘要	In this study, the integral and microscopic turbulent statistical characteristics of pressure fluctuations, applicability of the pressure gradient and pressure flux divergence to the Monin-Obukhov similarity theory (MOST), and contribution of the pressure transport term to turbulence kinetic energy (TKE) were analyzed using the turbulence observational data obtained from a field observational station over the Horqin Sandy Land in Inner Mongolia, China. The normalized standard deviations of the pressure fluctuations have no obvious relationship with the dimensionless stability parameter (z/L). The turbulent variance spectra of pressure fluctuations Sp(n) follow the n−2 scaling law with a peak frequency of approximately one to two orders of magnitude lower than that of the wind speed and temperature. The spectral gap also shifts to lower frequencies, and the transition from turbulent scale to the larger scale is sharper. The normalized vertical pressure gradient ([Formula presented]) has no significant relationship with z/L. The non-dimensional pressure transport term ([Formula presented]) represents the pressure flux divergence and is well related to the z/L with expressions of φp = ± (1 − 14.5z/L) for unstable stratifications and φp = ± (1 + 15.0z/L) for stable stratifications. The relative importance of pressure transport term in the TKE budget equation with respect to the shear production and buoyancy terms is larger at larger scales. The pressure transport term is averagely one order of magnitude larger than the sum of these two terms at scales above 5 min. The contribution of the pressure transport term to the TKE is non-negligible. © 2021 The Author(s)
英文关键词	Monin-Obukhov similarity theory; Pressure fluctuations; Pressure transport term; Turbulence kinetic energy budget equation
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236737
作者单位	Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Wei Z.,Zhang H.,Ren Y.,et al. Study on the characteristics of the pressure fluctuations and their contribution to turbulence kinetic energy[J],2021,258.
APA	Wei Z..,Zhang H..,Ren Y..,Li Q..,Cai X..,...&Kang L..(2021).Study on the characteristics of the pressure fluctuations and their contribution to turbulence kinetic energy.Atmospheric Research,258.
MLA	Wei Z.,et al."Study on the characteristics of the pressure fluctuations and their contribution to turbulence kinetic energy".Atmospheric Research 258(2021).