DOI: 10.1002/2017MS001055
Scopus记录号: 2-s2.0-85033225917
论文题名: A Heuristic Parameterization for the Integrated Vertical Overlap of Cumulus and Stratus
作者: Park S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 6 起始页码: 2437
结束页码: 2465
语种: 英语
英文关键词: Atmospheric radiation
; Parameterization
; Precipitation (meteorology)
; Tropics
; Cloud overlap
; Cloud radiative forcing
; Convective precipitation
; Cumulus and stratus
; Seoul National University
; Stratiform precipitation
; Surface precipitation
; Thermodynamic scalars
; Clouds
; cloud cover
; cloud radiative forcing
; cumulus
; heuristics
; integrated approach
; precipitation (climatology)
; solar radiation
; thermodynamics
; tropical region
英文摘要: The author developed a heuristic parameterization to handle the contrasting vertical overlap structures of cumulus and stratus in an integrated way. The parameterization assumes that cumulus is maximum-randomly overlapped with adjacent cumulus; stratus is maximum-randomly overlapped with adjacent stratus; and radiation and precipitation areas at each model interface are grouped into four categories, that is, convective, stratiform, mixed, and clear areas. For simplicity, thermodynamic scalars within individual portions of cloud, radiation, and precipitation areas are assumed to be internally homogeneous. The parameterization was implemented into the Seoul National University Atmosphere Model version 0 (SAM0) in an offline mode and tested over the globe. The offline control simulation reasonably reproduces the online surface precipitation flux and longwave cloud radiative forcing (LWCF). Although the cumulus fraction is much smaller than the stratus fraction, cumulus dominantly contributes to precipitation production in the tropics. For radiation, however, stratus is dominant. Compared with the maximum overlap, the random overlap of stratus produces stronger LWCF and, surprisingly, more precipitation flux due to less evaporation of convective precipitation. Compared with the maximum overlap, the random overlap of cumulus simulates stronger LWCF and weaker precipitation flux. Compared with the control simulation with separate cumulus and stratus, the simulation with a single-merged cloud substantially enhances the LWCF in the tropical deep convection and midlatitude storm track regions. The process-splitting treatment of convective and stratiform precipitation with an independent precipitation approximation (IPA) simulates weaker surface precipitation flux than the control simulation in the tropical region. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75718
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: School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
Recommended Citation:
Park S. A Heuristic Parameterization for the Integrated Vertical Overlap of Cumulus and Stratus[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(6)