DOI: 10.1002/2017MS000960
Scopus记录号: 2-s2.0-85022346603
论文题名: Coupled mesoscale-LES modeling of a diurnal cycle during the CWEX-13 field campaign: From weather to boundary-layer eddies
作者: Muñoz-Esparza D ; , Lundquist J ; K ; , Sauer J ; A ; , Kosović B ; , Linn R ; R
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 3 起始页码: 1572
结束页码: 1594
语种: 英语
英文关键词: Atmospheric boundary layer
; Boundary layers
; Large eddy simulation
; Optical radar
; Perturbation techniques
; Probability density function
; Shear flow
; Turbulence
; Computationally efficient
; CWEX-13
; Dynamical downscaling
; Explicit representation
; Multi-scale Modeling
; Multi-scale simulation
; Time varying parameter
; Turbulent velocity fluctuations
; Atmospheric thermodynamics
; boundary layer
; downscaling
; instrumentation
; large eddy simulation
; measurement method
; mesoscale eddy
; numerical model
; probability density function
; three-dimensional modeling
英文摘要: Multiscale modeling of a diurnal cycle of real-world conditions is presented for the first time, validated using data from the CWEX-13 field experiment. Dynamical downscaling from synoptic-scale down to resolved three-dimensional eddies in the atmospheric boundary layer (ABL) was performed, spanning 4 orders of magnitude in horizontal grid resolution: from 111 km down to 8.2 m (30 m) in stable (convective) conditions. Computationally efficient mesoscale-to-microscale transition was made possible by the generalized cell perturbation method with time-varying parameters derived from mesoscale forcing conditions, which substantially reduced the fetch to achieve fully developed turbulence. In addition, careful design of the simulations was made to inhibit the presence of under-resolved convection at convection-resolving mesoscale resolution and to ensure proper turbulence representation in stably-stratified conditions. Comparison to in situ wind-profiling lidar and near-surface sonic anemometer measurements demonstrated the ability to reproduce the ABL structure throughout the entire diurnal cycle with a high degree of fidelity. The multiscale simulations exhibit realistic atmospheric features such as convective rolls and global intermittency. Also, the diurnal evolution of turbulence was accurately simulated, with probability density functions of resolved turbulent velocity fluctuations nearly identical to the lidar measurements. Explicit representation of turbulence in the stably-stratified ABL was found to provide the right balance with larger scales, resulting in the development of intra-hour variability as observed by the wind lidar; this variability was not captured by the mesoscale model. Moreover, multiscale simulations improved mean ABL characteristics such as horizontal velocity, vertical wind shear, and turbulence. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75759
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States; National Renewable Energy Laboratory, Golden, CO, United States; Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Muñoz-Esparza D,, Lundquist J,K,et al. Coupled mesoscale-LES modeling of a diurnal cycle during the CWEX-13 field campaign: From weather to boundary-layer eddies[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(3)