DOI: 10.1002/jgrd.50621
论文题名: Structure of the planetary boundary layer over Southeast England: Modeling and measurements
作者: Xie B. ; Hunt J.C.R. ; Carruthers D.J. ; Fung J.C.H. ; Barlow J.F.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7799
结束页码: 7818
语种: 英语
英文关键词: convective
; nonlocal
; PBL height
; TKE
; WRF
Scopus关键词: Air quality
; Atmospheric thermodynamics
; Boundary layer flow
; Heat flux
; Kinetics
; Large eddy simulation
; Mixing
; convective
; Nonlocal
; PBL height
; TKE
; WRF
; Weather forecasting
; boundary layer
; forecasting method
; heat balance
; kinetic energy
; measurement method
; numerical model
; Richardson number
; stabilization
; thermodynamics
; turbulence
; England
; London [England]
; United Kingdom
英文摘要: The Weather Research and Forecasting model was applied to analyze variations in the planetary boundary layer (PBL) structure over Southeast England including central and suburban London. The parameterizations and predictive skills of two nonlocal mixing PBL schemes, YSU and ACM2, and two local mixing PBL schemes, MYJ and MYNN2, were evaluated over a variety of stability conditions, with model predictions at a 3 km grid spacing. The PBL height predictions, which are critical for scaling turbulence and diffusion in meteorological and air quality models, show significant intra-scheme variance (> 20%), and the reasons are presented. ACM2 diagnoses the PBL height thermodynamically using the bulk Richardson number method, which leads to a good agreement with the lidar data for both unstable and stable conditions. The modeled vertical profiles in the PBL, such as wind speed, turbulent kinetic energy (TKE), and heat flux, exhibit large spreads across the PBL schemes. The TKE predicted by MYJ were found to be too small and show much less diurnal variation as compared with observations over London. MYNN2 produces better TKE predictions at low levels than MYJ, but its turbulent length scale increases with height in the upper part of the strongly convective PBL, where it should decrease. The local PBL schemes considerably underestimate the entrainment heat fluxes for convective cases. The nonlocal PBL schemes exhibit stronger mixing in the mean wind fields under convective conditions than the local PBL schemes and agree better with large-eddy simulation (LES) studies. Key Points The predictive skills of different PBL schemes were evaluated The PBL height variations and the diagnostic formulations were discussed The profiles of mean and turbulent quantities were compared ©2013. 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/63535
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Science, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; Departments of Space and Climate Physics and Earth Sciences, University College London, London, United Kingdom; Cambridge Environment Research Consultants, Cambridge, United Kingdom; Department of Mathematics, Hong Kong University of Science and Technology, Kowloon, Hong Kong; Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Xie B.,Hunt J.C.R.,Carruthers D.J.,et al. Structure of the planetary boundary layer over Southeast England: Modeling and measurements[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)