DOI: 10.1007/s00382-012-1575-x
Scopus记录号: 2-s2.0-84881029683
论文题名: An approximate energy cycle for inter-member variability in ensemble simulations of a regional climate model
作者: Nikiéma O. ; Laprise R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-03-04 起始页码: 831
结束页码: 852
语种: 英语
英文关键词: Atmospheric energy cycle
; Ensemble of simulations
; Inter-member variability
; Internal variability
; Regional climate models
英文摘要: The presence of internal variability (IV) in ensembles of nested regional climate model (RCM) simulations is now widely acknowledged in the community working on dynamical downscaling. IV is defined as the inter-member spread between members in an ensemble of simulations performed by a given RCM driven by identical lateral boundary conditions (LBC), where different members are being initialised at different times. The physical mechanisms responsible for the time variations and structure of such IV have only recently begun to receive attention. Recent studies have shown empirical evidence of a close parallel between the energy conversions associated with the time fluctuations of IV in ensemble simulations of RCM and the energy conversions taking place in weather systems. Inspired by the classical work on global energetics of weather systems, we sought a formulation of an energy cycle for IV that would be applicable for limited-area domain. We develop here a novel formalism based on local energetics that can be applied to further our understanding IV. Prognostic equations for ensemble-mean kinetic energy and available enthalpy are decomposed into contributions due to ensemble-mean variables (EM) and those due to deviations from the ensemble mean (IV). Together these equations constitute an energy cycle for IV in ensemble simulations of RCM. Although the energy cycle for IV was developed in a context entirely different from that of energetics of weather systems, the exchange terms between the various reservoirs have a rather similar mathematical form, which facilitates some interpretations of their physical meaning. © 2012 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54832
Appears in Collections: 过去全球变化的重建
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作者单位: Département des Sciences de la Terre et de l'Atmosphère, Centre ESCER (Étude et Simulation du Climat à l'Échelle Régionale), UQAM, P.O. 8888, Stn Downtown, Montreal, QC, H3C 3P8, Canada
Recommended Citation:
Nikiéma O.,Laprise R.. An approximate energy cycle for inter-member variability in ensemble simulations of a regional climate model[J]. Climate Dynamics,2013-01-01,41(2017-03-04)