DOI: 10.1175/JCLI-D-17-0671.1
Scopus记录号: 2-s2.0-85047072627
论文题名: A unified moisture mode framework for seasonality of the Madden-Julian oscillation
作者: Jiang X. ; Adames Á.F. ; Zhao M. ; Waliser D. ; Maloney E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 11 起始页码: 4215
结束页码: 4224
语种: 英语
英文关键词: Climate models
; Intraseasonal variability
; Monsoons
Scopus关键词: Atmospheric thermodynamics
; Climate models
; Moisture
; Troposphere
; Climatological distributions
; Eastward propagation
; Horizontal advection
; Intraseasonal variability
; Madden-Julian oscillation
; Model development
; Monsoons
; Seasonal variation
; Climatology
英文摘要: The Madden-Julian oscillation (MJO) exhibits pronounced seasonality. While it is largely characterized by equatorially eastward propagation during the boreal winter, MJO convection undergoes marked poleward movement over the Asian monsoon region during summer, producing a significant modulation of monsoon rainfall. In classical MJO theories that seek to interpret the distinct seasonality in MJO propagation features, the role of equatorial wave dynamics has been emphasized for its eastward propagation, whereas coupling between MJO convection and the mean monsoon flow is considered essential for its northward propagation. In this study, a unified physical framework based on the moisture mode theory, is offered to explain the seasonality in MJO propagation. Moistening and drying caused by horizontal advection of the lower-tropospheric mean moisture by MJO winds, which was recently found to be critical for the eastward propagation of the winter MJO, is also shown to play a dominant role in operating the northward propagation of the summer MJO. The seasonal variations in the mean moisture pattern largely shape the distinct MJO propagation in different seasons. The critical role of the seasonally varying climatological distribution of moisture for the MJO propagation is further supported by the close association between model skill in representing the MJO propagation and skill at producing the lower-tropospheric mean moisture pattern. This study thus pinpoints an important direction for climate model development for improved MJO representation during all seasons. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111513
Appears in Collections: 气候减缓与适应
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作者单位: Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, Los Angeles, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Jiang X.,Adames Á.F.,Zhao M.,et al. A unified moisture mode framework for seasonality of the Madden-Julian oscillation[J]. Journal of Climate,2018-01-01,31(11)