globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015MS000493
Scopus记录号: 2-s2.0-84959536194
论文题名:
The effect of large-scale model time step and multiscale coupling frequency on cloud climatology, vertical structure, and rainfall extremes in a superparameterized GCM
作者: Yu S; , Pritchard M; S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期:4
起始页码: 1977
结束页码: 1996
语种: 英语
英文关键词: Climate models ; Climatology ; Cloud forcing ; Coupling frequencies ; Extreme rainfall ; Superparameterization ; Time step ; Rain ; climate modeling ; climatology ; cloud cover ; cloud radiative forcing ; convection ; coupling ; general circulation model ; global climate ; rainfall ; sensitivity analysis ; temperature gradient
英文摘要: The effect of global climate model (GCM) time step-which also controls how frequently global and embedded cloud resolving scales are coupled-is examined in the Superparameterized Community Atmosphere Model ver 3.0. Systematic bias reductions of time-mean shortwave cloud forcing (-10 W/m2) and longwave cloud forcing (-5 W/m2) occur as scale coupling frequency increases, but with systematically increasing rainfall variance and extremes throughout the tropics. An overarching change in the vertical structure of deep tropical convection, favoring more bottom-heavy deep convection as a global model time step is reduced may help orchestrate these responses. The weak temperature gradient approximation is more faithfully satisfied when a high scale coupling frequency (a short global model time step) is used. These findings are distinct from the global model time step sensitivities of conventionally parameterized GCMs and have implications for understanding emergent behaviors of multiscale deep convective organization in superparameterized GCMs. The results may also be useful for helping to tune them. © 2015. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75973
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 Earth System Sciences, University of California, Irvine, CA, United States

Recommended Citation:
Yu S,, Pritchard M,S. The effect of large-scale model time step and multiscale coupling frequency on cloud climatology, vertical structure, and rainfall extremes in a superparameterized GCM[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(4)
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