DOI: 10.1002/2014MS000393
Scopus记录号: 2-s2.0-85027919345
论文题名: Role of water vapor and convection-circulation decoupling in MJO simulations by a tropical channel model
作者: Ulate M ; , Zhang C ; , Dudhia J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 692
结束页码: 711
语种: 英语
英文关键词: Boiler circulation
; Error correction
; Errors
; Heat convection
; Channel model
; decoupling
; MJO
; Planetary scale
; Propagation speed
; Realistic simulation
; Spatial structure
; Zonal propagation
; Water vapor
; error analysis
; Madden-Julian oscillation
; perturbation
; precipitation (climatology)
; simulation
; troposphere
; water vapor
; wave propagation
; zonal wind
英文摘要: A tropical channel model failed to simulate an observed MJO event. As a means to find reasons for the failure, model errors in water vapor (qv) and other fields were corrected to different extents by nudging towards a global reanalysis product. An MJO metric was developed to quantify the realism of a simulated MJO event in the amplitude and zonal propagation speed of its precipitation and zonal wind at 850 hPa (U850). Results show that correcting errors in qv alone is necessary and sufficient for a realistic simulation of the MJO event. Correcting errors in other fields is insufficient by itself and unnecessary with water vapor correction. For a realistic MJO simulation, error corrections are needed for qv perturbations of the planetary scales (zonal wave number 1-3) together with its zonal mean in both the lower and middle troposphere. Correcting errors in qv at upper levels, planetary-scale perturbations of any single zonal wave number, synoptic-scale perturbations, or temporal/zonal means alone is not sufficient for a realistic MJO simulation. Amplitudes of MJO precipitation and U850 are significantly correlated, but their propagation speeds are not. MJO signals in U850 are easier than those in precipitation to improve by correcting errors in qv. In the absence of MJO intrinsic dynamics, inserted MJO signals in qv in a simulation may create a phantom MJO event in precipitation but not in the circulation. This study confirms the existing knowledge on the importance of qv to MJO simulations, sheds new lights on the role of the qv spatial structure, and presents evidence for possible precipitation-circulation decoupling in MJO simulations. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76044
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: Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Ulate M,, Zhang C,, Dudhia J. Role of water vapor and convection-circulation decoupling in MJO simulations by a tropical channel model[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)