DOI: 10.1175/JCLI-D-15-0862.1
Scopus记录号: 2-s2.0-84971435086
论文题名: MJO propagation across the maritime continent in the ECMWF ensemble prediction system
作者: Kim H.-M. ; Kim D. ; Vitart F. ; Toma V.E. ; Kug J.-S. ; Webster P.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 11 起始页码: 3973
结束页码: 3988
语种: 英语
Scopus关键词: Climate models
; Climatology
; Forecasting
; Mechanical waves
; Tropics
; Atmospheric conditions
; Ensemble prediction systems
; Geographic location
; Hindcasts
; Intraseasonal variability
; Moisture advection
; Rossby wave response
; Variability
; Oceanography
; climate modeling
; climate prediction
; ensemble forecasting
; hindcasting
; Madden-Julian oscillation
; maritime boundary
; Rossby wave
; seasonal variation
; weather forecasting
; Indian Ocean
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: The characteristics of the MJO propagation across the Maritime Continent are investigated using a 20-yr reforecast dataset from the ECMWF ensemble prediction system. Analysis of the MJO events initialized over the Indian Ocean (phase 2) shows that the initial MJO amplitude and prediction skill relationship is not linear, particularly when the predictions start in moderate (between strong and weak) MJO amplitude category. To examine the key factors that determine the prediction skill, reforecasts in the moderate category are grouped into high- and low-skill events, and the differences in their ocean-atmospheric conditions as well as the physical processes during reforecast period are examined. The initial distribution of OLR anomalies in high-skill events shows a clear dipole pattern of convection with an enhanced convective anomalies over the Indian Ocean and strongly suppressed convective anomalies in the western Pacific Ocean. This dipole mode may support the MJO propagation across the Maritime Continent via the Rossby wave response and associated meridional moisture advection. Prominent ocean-atmosphere coupled processes are also simulated during the propagation of high-skill events. However, in low-skill events, the convective signal over the western Pacific is almost absent and less organized, and the ocean-atmosphere coupled processes are not simulated correctly. It is found that in both high- and low-skill events, the amplitude of the convective anomaly decreases significantly after about day 15, possibly due to the systematic mean model bias. A strong wet bias in the vicinity of the Maritime Continent, a cold SST bias in the equatorial Pacific, and associated circulation biases make the west Pacific area unfavorable for MJO propagation, thus limiting its prediction skill. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49916
Appears in Collections: 气候变化事实与影响
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作者单位: School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States; Department of Atmospheric Science, University of Washington, Seattle, WA, United States; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom; School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, United States; School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea
Recommended Citation:
Kim H.-M.,Kim D.,Vitart F.,et al. MJO propagation across the maritime continent in the ECMWF ensemble prediction system[J]. Journal of Climate,2016-01-01,29(11)