DOI: 10.1175/JCLI-D-14-00373.1
Scopus记录号: 2-s2.0-84942873587
论文题名: Onset of the rainy seasons in the eastern Indochina Peninsula
作者: Nguyen-Le D. ; Matsumoto J. ; Ngo-Duc T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 14 起始页码: 5645
结束页码: 5666
语种: 英语
Scopus关键词: Climate change
; Climatology
; Nickel
; Oceanography
; Orthogonal functions
; Rain
; Statistics
; Asia
; ENSO
; Interannual variability
; Intraseasonal variability
; Monsoons
; Atmospheric thermodynamics
; annual variation
; anticyclone
; atmospheric convection
; easterly wave
; El Nino-Southern Oscillation
; monsoon
; rainfall
; seasonal variation
; Walker circulation
; westerly
; Indian Ocean
; Indochina
; Pacific Ocean
; Philippine Sea
英文摘要: The onset dates of rainy season over the eastern Indochina Peninsula (8.5°-23.5°N, 100°-110°E) are objectively determined for individual years from 1958 to 2007 using the empirical orthogonal function (EOF) analysis. On average, the onset of the summer rainy season (SRS) determined by EOF1 is 6 May, with a standard deviation of 13 days. The autumn rainy season (ARS) indicated by EOF2 has a mean onset and standard deviation of 16 September and 12 days, respectively. The SRS onset is characterized by the evolution of summer monsoon westerlies and the northward propagation of strong convection from the equatorial region. Conversely, the withdrawal of the summer monsoon over northeastern Indochina in late summer-early autumn favors the ARS onset. Both onsets are strongly associated with intraseasonal oscillation on 30-60- and 10-20-day time scales. Examination of the precursory signals associated with the early/late onsets of both SRS and ARS implies that ENSO has a significant impact on their year-to-year variations. In La Niña years, the subsequent SRS tends to have early onsets. Simultaneously, the western Pacific subtropical high (WPSH) weakens and retreats eastward earlier. In contrast, advanced ARS onset generally occurs during an El Niño-developing autumn with weakened equatorial easterlies and suppressed convection over the central Indian Ocean from the preceding summer, as evident in weakened Walker circulation. However, robust precursory signals in SST are observed only from midsummer (July-August). An earlier ARS onset is also associated with the development of an anomalous Philippine Sea anticyclone and a westward-extended WPSH from midsummer. However, no coherent correlation is found between the late onset and La Niña. © 2015 American Meteorological Society. 资助项目: NAFOSTED, National Foundation for Science and Technology Development
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50520
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography, Tokyo Metropolitan University, Hachioji, Tokyo, Japan; Department of Coupled Ocean-Land-Atmosphere Processes Research, JAMSTEC, Yokosuka, Kanagawa, Japan; Department of Meteorology and Climate Change, Hanoi College of Science, Vietnam National University, Hanoi, Viet Nam
Recommended Citation:
Nguyen-Le D.,Matsumoto J.,Ngo-Duc T.. Onset of the rainy seasons in the eastern Indochina Peninsula[J]. Journal of Climate,2015-01-01,28(14)