DOI: 10.1175/JCLI-D-11-00512.1
Scopus记录号: 2-s2.0-84867682021
论文题名: Nonlinear, intraseasonal phases of the East Asian summer monsoon: Extraction and analysis using self-organizing maps
作者: Chu J.-E. ; Hameed S.N. ; Ha K.-J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 20 起始页码: 6975
结束页码: 6988
语种: 英语
Scopus关键词: Dry spells
; East Asian summer monsoon
; ENSO
; Interannual time scale
; Intraseasonal time scale
; Intraseasonal variability
; Multivariate data
; Nonlinear characteristics
; Pressure system
; Rainfall anomaly
; Regional characteristics
; Self-organizing mapping
; Summer/warm season
; Climate change
; Conformal mapping
; Dynamics
; Neural networks
; Nickel compounds
; Rain
; Time measurement
; Tropics
; Vorticity
; Nonlinear analysis
; algorithm
; anticyclone
; artificial neural network
; atmospheric circulation
; cyclone
; El Nino-Southern Oscillation
; jet stream
; La Nina
; monsoon
; multivariate analysis
; rainfall
; seasonal variation
; summer
; vorticity
; wind
; China
; Japan
; Korea
; Citrus maxima
英文摘要: The hypothesis that regional characteristics of the East Asian summer monsoon (EASM) result from the presence of nonlinear coupled features that modulate the seasonal circulation and rainfall at the intraseasonal time scale is advanced in this study. To examine this hypothesis, the authors undertake the analysis of daily EASM variability using a nonlinear multivariate data classifying algorithm known as self-organizing mapping (SOM). On the basis of various SOM node analyses, four major intraseasonal phases of the EASM are identified. The first node describes a circulation state corresponding to weak tropical and subtropical pressure systems, strong upper-level jets, weakened monsoonal winds, and cyclonic upper-level vorticity. This mode, related to large rainfall anomalies in southeast China and southern Japan, is identified as the mei-yu-baiu phase. The second node represents a distinct circulation state corresponding to a strengthened subtropical high, monsoonal winds, and anticyclonic upper-level vorticity in southeast Korea, which is identified as the changma phase. The third node is related to copious rain over Korea following changma, which we name the postchangma phase. The fourth node is situated diagonally opposite the changma mode. Because Korea experiences a dry spell associated with this SOM node, it is referred to as the dry-spell phase. The authors also demonstrate that a strong modulation of the changma and dry-spell phases on interannual time scales occurs during El Niño and La Niñ a years. Results imply that the key to predictability of the EASM on interannual time scales may lie with analysis and exploitation of its nonlinear characteristics. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52194
Appears in Collections: 气候变化事实与影响
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作者单位: Division of Earth Environmental System, Pusan National University, Busan, South Korea; Center for Advanced Information Science and Technology, University of Aizu, Aizu-Wakamatsu City, Japan; Division of Earth Environmental System, Pusan National University, Busan, South Korea
Recommended Citation:
Chu J.-E.,Hameed S.N.,Ha K.-J.. Nonlinear, intraseasonal phases of the East Asian summer monsoon: Extraction and analysis using self-organizing maps[J]. Journal of Climate,2012-01-01,25(20)