DOI: 10.1002/2016MS000802
Scopus记录号: 2-s2.0-85018732880
论文题名: Organization of tropical convection in low vertical wind shears: Role of updraft entrainment
作者: Tompkins A ; M ; , Semie A ; G
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 2 起始页码: 1046
结束页码: 1068
语种: 英语
英文关键词: Budget control
; Mixing
; Turbulence
; Water vapor
; Climate feedbacks
; Clustering
; Horizontal diffusions
; Horizontal resolution
; Radiative-convective equilibrium
; Self aggregation
; Subgrid turbulence
; Vertical wind shear
; Air entrainment
; climate feedback
; cluster analysis
; convection
; diabatic process
; entrainment
; numerical model
; turbulent mixing
; updraft
; water vapor
; wind shear
英文摘要: Radiative-convective equilibrium simulations with a 2 km horizontal resolution are conducted to investigate the impact on convective organization of different parameterizations for horizontal and vertical subgrid turbulence mixing. Three standard approaches for representing horizontal diffusion produce starkly differing mixing rates, particularly for the entrainment mixing into updrafts, which differ by more than an order of magnitude between the schemes. The simulations demonstrate that the horizontal subgrid mixing of water vapor is key, with high mixing rates a necessary condition for organization of convection to occur, since entrainment of dry air into updrafts suppresses convection. It is argued that diabatic budgets, while demonstrating the role of spatially heterogeneous radiative heating rates in driving organization, can overlook the role of physical processes such as updraft entrainment. These results may partially explain previous studies that showed that organization is more likely to occur at coarser resolutions, when entrainment is solely represented by subgrid-scale turbulence schemes, highlighting the need for benchmark simulations of higher horizontal resolution. The recommendation is for the use of larger ensembles to ensure robustness of conclusions to subgrid-scale parameterization assumptions when numerically investigating convective organization, possibly through a coordinated community model intercomparison effort. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75795
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: Earth System Physics, Abdus Salam International Centre for Theoretical Physics, Trieste, Italy; Now at: Laboratoire de Météorologie Dynamique, Paris, France
Recommended Citation:
Tompkins A,M,, Semie A,et al. Organization of tropical convection in low vertical wind shears: Role of updraft entrainment[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)