DOI: 10.1002/2017MS000912
Scopus记录号: 2-s2.0-85026625093
论文题名: Nested mesoscale-to-LES modeling of the atmospheric boundary layer in the presence of under-resolved convective structures
作者: Mazzaro L ; J ; , Muñoz-Esparza D ; , Lundquist J ; K ; , Linn R ; R
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 4 起始页码: 1795
结束页码: 1810
语种: 英语
英文关键词: Atmospheric thermodynamics
; Boundary conditions
; Boundary layer flow
; Boundary layers
; Computational fluid dynamics
; Kinetic energy
; Kinetics
; Large eddy simulation
; Reynolds number
; Turbulent flow
; Wind
; Convective boundary layers
; Dry convective boundary layer
; Grid nesting
; Lateral boundary conditions
; Mesoscale
; Periodic boundary conditions
; Spatio-temporal resolution
; Terra incognita
; Atmospheric boundary layer
; atmospheric convection
; atmospheric modeling
; boundary layer
; heat flux
; large eddy simulation
; mesoscale eddy
; parameterization
; periodicity
; temperature profile
; weather forecasting
; wind velocity
英文摘要: Multiscale atmospheric simulations can be computationally prohibitive, as they require large domains and fine spatiotemporal resolutions. Grid-nesting can alleviate this by bridging mesoscales and microscales, but one turbulence scheme must run at resolutions within a range of scales known as the terra incognita (TI). TI grid-cell sizes can violate both mesoscale and microscale subgrid-scale parametrization assumptions, resulting in unrealistic flow structures. Herein we assess the impact of unrealistic lateral boundary conditions from parent mesoscale simulations at TI resolutions on nested large eddy simulations (LES), to determine whether parent domains bias the nested LES. We present a series of idealized nested mesoscale-to-LES runs of a dry convective boundary layer (CBL) with different parent resolutions in the TI. We compare the nested LES with a stand-alone LES with periodic boundary conditions. The nested LES domains develop ∼20% smaller convective structures, while potential temperature profiles are nearly identical for both the mesoscales and LES simulations. The horizontal wind speed and surface wind shear in the nested simulations closely resemble the reference LES. Heat fluxes are overestimated by up to ∼0.01 K m s−1 in the top half of the PBL for all nested simulations. Overestimates of turbulent kinetic energy (TKE) and Reynolds stress in the nested domains are proportional to the parent domain's grid-cell size, and are almost eliminated for the simulation with the finest parent grid-cell size. Based on these results, we recommend that LES of the CBL be forced by mesoscale simulations with the finest practical resolution. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75746
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: Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; National Center for Atmospheric Research, Boulder, CO, United States; National Renewable Energy Laboratory, Golden, CO, United States
Recommended Citation:
Mazzaro L,J,, Muñoz-Esparza D,et al. Nested mesoscale-to-LES modeling of the atmospheric boundary layer in the presence of under-resolved convective structures[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(4)