DOI: 10.1002/joc.5534
论文题名: Large-scale patterns and possible mechanisms of 10–20-day intra-seasonal oscillation of the observed rainfall in Vietnam
作者: Truong N.M. ; Tuan B.M.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 10 起始页码: 3801
结束页码: 3821
语种: 英语
英文关键词: conditional instability
; intra-seasonal oscillation
; large-scale patterns
; moisture flux
; observed rainfall
Scopus关键词: Mechanical waves
; Moisture
; Ocean currents
; Rain
; Equatorial Rossby waves
; Intra-seasonal
; Long-wave radiation
; Moisture flux convergences
; Moisture fluxes
; Scale pattern
; Tropical Indian ocean
; Unstable conditions
; Tropical engineering
; air mass
; anticyclone
; cold air
; gyre
; longwave radiation
; moisture flux
; rainfall
; regional climate
; Rossby wave
; seasonal variation
; topographic effect
; Indian Ocean
; Indian Ocean (Tropical)
; Viet Nam
英文摘要: The present study investigates 10–20-day intra-seasonal oscillation (10–20-day ISO) of the 29-year daily observed rainfall in north, central, and south Vietnam in rainy seasons. The 10–20-day band-pass Lanczos filter is applied to the time series of the regional daily rainfall, daily reanalysis fields, and outgoing long-wave radiation. The 10–20-day ISO in north Vietnam is governed by the alternate occurrence of moisture flux divergence (convergence), which may regulate local lagged conditionally unstable (stable) anomalies. In south Vietnam, the dry (wet) phase is determined by moisture flux divergence (convergence) associated with anticyclonic (cyclonic) gyres that are destroyed later by lagged unstable (stable) anomalies that evolve within the gyres. In both cases, the alternate occurrence of the conditionally unstable and stable anomalies reverses moisture flux and circulations not only over the regions but also in the tropical Indian Ocean in the form of equatorial Rossby waves. The wet phase in central Vietnam is uniquely caused by moisture flux convergence, instead of local unstable condition, which is associated with southwards propagation of cold dry air masses (or cold surges) from the Eurasian continent. Topography also plays an important role in modulating the 10–20-day ISO, especially in central Vietnam as it helps block northeasterly winds associated with cold air masses. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116813
Appears in Collections: 气候减缓与适应
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作者单位: Hanoi University of Science, Hanoi, Viet Nam
Recommended Citation:
Truong N.M.,Tuan B.M.. Large-scale patterns and possible mechanisms of 10–20-day intra-seasonal oscillation of the observed rainfall in Vietnam[J]. International Journal of Climatology,2018-01-01,38(10)