DOI: 10.1007/s00382-016-3285-2
Scopus记录号: 2-s2.0-84979651464
论文题名: Effective control parameters in a deep convection scheme for improved simulation of the Madden–Julian oscillation
作者: Choi J.-H. ; Seo K.-H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-11-12 起始页码: 3583
结束页码: 3597
语种: 英语
英文关键词: Critical relative humidity of the boundary layer
; Fraction of re-evaporation of convective precipitation
; Madden–Julian oscillation
; NCEP CFS model
; RAS deep convection scheme
英文摘要: This work seeks to find the most effective parameters in a deep convection scheme (relaxed Arakawa–Schubert scheme) of the National Centers of Environmental Prediction Climate Forecast System model for improved simulation of the Madden–Julian Oscillation (MJO). A suite of sensitivity experiments are performed by changing physical components such as the relaxation parameter of mass flux for adjustment of the environment, the evaporation rate from large-scale precipitation, the moisture trigger threshold using relative humidity of the boundary layer, and the fraction of re-evaporation of convective (subgrid-scale) rainfall. Among them, the last two parameters are found to produce a significant improvement. Increasing the strength of these two parameters reduces light rainfall that inhibits complete formation of the tropical convective system or supplies more moisture that help increase a potential energy to large-scale environment in the lower troposphere (especially at 700 hPa), leading to moisture preconditioning favorable for further development and eastward propagation of the MJO. In a more humid environment, more organized MJO structure (i.e., space–time spectral signal, eastward propagation, and tilted vertical structure) is produced. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: KISTI, Korea Institute of Science and Technology Information
; NRF, National Research Foundation of Korea
; NRF, National Research Foundation of Korea
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53224
Appears in Collections: 过去全球变化的重建
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作者单位: Division of Earth Environmental System, Department of Atmospheric Sciences, Pusan National University, Busan, South Korea
Recommended Citation:
Choi J.-H.,Seo K.-H.. Effective control parameters in a deep convection scheme for improved simulation of the Madden–Julian oscillation[J]. Climate Dynamics,2017-01-01,48(2017-11-12)