DOI: 10.1175/2011JCLI4059.1
Scopus记录号: 2-s2.0-84155188462
论文题名: Improved Madden-Julian oscillations with improved physics: The impact of modified convection parameterizations
作者: Zhou L. ; Neale R.B. ; Jochum M. ; Murtugudde R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 4 起始页码: 1116
结束页码: 1136
语种: 英语
Scopus关键词: Coherent structure
; Community climate system model
; Convective heating
; Conveyor belts
; Deep convection
; Eastward propagation
; Intraseasonal variability
; Madden-Julian oscillation
; Parameterizations
; Plumes
; Transport
; Zonal wind
; Belt conveyors
; Heat convection
; Momentum
; Climate models
; air-sea interaction
; convection
; Madden-Julian oscillation
; momentum transfer
; parameterization
; perturbation
; potential energy
; seasonal variation
; temperature gradient
; zonal wind
英文摘要: Two modifications are made to the deep convection parameterization in the NCAR Community Climate System Model, version 3 (CCSM3): a dilute plume approximation and an implementation of the convective momentumtransport (CMT). These changes lead to significant improvement in the simulated Madden-Julian oscillations (MJOs). With the dilute plume approximation, temperature and convective heating perturbations become more positively correlated. Consequently, more available potential energy is generated and the intraseasonal variability (ISV) becomes stronger. The organization of ISV is also improved, which is manifest in coherent structures between different MJO phases and an improved simulation of the eastward propagation of MJOs with a reasonable eastward speed. The improved propagation can be attributed to a better simulation of the low-level zonal winds due to the inclusion of CMT. The authors posit that the large-scale zonal winds are akin to a selective conveyor belt that facilitates the organization of ISVs into highly coherent structures, which are important features of observed MJOs. The conclusions are supported by two supplementary experiments, which include the dilute plume approximation and CMT separately. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52543
Appears in Collections: 气候变化事实与影响
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作者单位: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography, SOA, Hangzhou, China; National Center for Atmospheric Research, Boulder, CO, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, MD, United States
Recommended Citation:
Zhou L.,Neale R.B.,Jochum M.,et al. Improved Madden-Julian oscillations with improved physics: The impact of modified convection parameterizations[J]. Journal of Climate,2012-01-01,25(4)