DOI: 10.1002/2017JD027041
Scopus记录号: 2-s2.0-85042178647
论文题名: Vertical Variation of the Effects of Atmospheric Stability on Turbulence Statistics Within the Roughness Sublayer Over Real Urban Canopy
作者: Zou J. ; Sun J. ; Liu G. ; Yuan R. ; Zhang H.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 4 起始页码: 2017
结束页码: 2036
语种: 英语
英文关键词: local similarity theory
; standard deviation of temperature
; standard deviation of velocity
; urban roughness sublayer
; vertical variation
Scopus关键词: air temperature
; boundary layer
; canopy architecture
; eddy covariance
; observational method
; roughness
; statistical analysis
; turbulence
; urban area
; China
英文摘要: Eddy correlation measurements have been carried out at six different heights above the urban canopy in three cities of China, that is, Nanjing, Changzhou, and Suzhou. Observations at these heights are used to evaluate the dependence of normalized standard deviations of velocity components σi/u*l (i = u, v, w) and temperature σTv on local atmospheric stability ζ (=(z − zd)/Λ), where u*l is the local friction velocity, Tv*l is the local temperature scale, zd is the displacement height, and Λ is the local Obukhov length. It is found that the universal functions ai(1 + bi| ζ|)1/3 and bTv|ζ|-1/3, in which ai, bi, and bTv are empirical coefficients, are suitable for describing the behaviors of σi/u*l and σTv/Tv*, respectively. Under neutral conditions (|ζ| < 0.05), the value of σi/u*l (approximately equal to ai) decreases with height. On the other hand, bi increases with height under both unstable (ζ < − 0.05) and stable (ζ > 0.05) conditions, suggesting that the thermal effect of stratification on the standard deviations of velocity components increases with height in the urban roughness sublayer. However, the behavior of σTv/Tv* is different from that of σi/u*l. bTv remains constant with height under unstable conditions but increases with height under stable conditions. Vertical variations of these coefficients in the universal functions are consistent with the concept of local similarity, suggesting that the turbulence behavior in the urban roughness sublayer is different from that over the flat terrain. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114443
Appears in Collections: 气候减缓与适应
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作者单位: School of Atmospheric Sciences and Institute for Climate and Global Change Research, Nanjing University, Nanjing, China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Ministry of Education, Nanjing, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
Recommended Citation:
Zou J.,Sun J.,Liu G.,et al. Vertical Variation of the Effects of Atmospheric Stability on Turbulence Statistics Within the Roughness Sublayer Over Real Urban Canopy[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(4)