DOI: 10.1002/2014MS000356
Scopus记录号: 2-s2.0-85027948729
论文题名: Resolution-dependent behavior of subgrid-scale vertical transport in the Zhang-McFarlane convection parameterization
作者: Xiao H ; , Gustafson W ; I ; , Jr ; , Hagos S ; M ; , Wu C ; -M ; , Wan H
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 537
结束页码: 550
语种: 英语
英文关键词: Potential energy
; Stochastic systems
; Cloud resolving model
; Convection parameterization
; Convective available potential energies
; Convective transport
; High spatial resolution
; Quasi equilibrium
; Simple modifications
; Stochastic treatment
; Parameterization
; advection
; convection
; equilibrium
; parameterization
; resolution
; simulation
英文摘要: To better understand the behavior of quasi-equilibrium-based convection parameterizations at higher resolution, we use a diagnostic framework to examine the resolution-dependence of subgrid-scale vertical transport of moist static energy as parameterized by the Zhang-McFarlane convection parameterization (ZM). Grid-scale input to ZM is supplied by coarsening output from cloud-resolving model (CRM) simulations onto subdomains ranging in size from 8 × 8 to 256 × 256 km2. Then the ZM-based parameterization of vertical transport of moist static energy for scales smaller than the subdomain size (w′h′¯ZM) are compared to those directly calculated from the CRM simulations (w′h′¯CRM) for different subdomain sizes. The ensemble mean w′h′¯CRM decreases by more than half as the subdomain size decreases from 128 to 8 km across while w′h′¯ZM decreases with subdomain size only for strong convection cases and increases for weaker cases. The resolution dependence of w′h′¯ZM is determined by the positive-definite grid-scale tendency of convective available potential energy (CAPE) in the convective quasi-equilibrium (QE) closure. Further analysis shows the actual grid-scale tendency of CAPE (before taking the positive definite value) and w′h′¯CRM behave very similarly as the subdomain size changes because they are both tied to grid-scale advective tendencies. We can improve the resolution dependence of w′h′¯ZM significantly by averaging the grid-scale tendency of CAPE over an appropriately large area surrounding each subdomain before taking its positive definite value. Even though the ensemble mean w′h′¯CRM decreases with increasing resolution, its variability increases dramatically. w′h′¯ZM cannot capture such increase in the variability, suggesting the need for stochastic treatment of convection at relatively high spatial resolution (8 or 16 km). Key Points: ZM convective transport resolution-dependence is determined by QE closure Simple modification of closure improves significantly the resolution dependence © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76053
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: Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington, United States; Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan
Recommended Citation:
Xiao H,, Gustafson W,I,et al. Resolution-dependent behavior of subgrid-scale vertical transport in the Zhang-McFarlane convection parameterization[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)