DOI: 10.1002/jgrd.50422
论文题名: Impact of the quasi-biweekly oscillation over the western North Pacific on East Asian subtropical monsoon during early summer
作者: Jia X. ; Yang S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4421
结束页码: 4434
语种: 英语
英文关键词: intraseasonal oscillation
; subtropical monsoon
Scopus关键词: Atmospheric thermodynamics
; Climate change
; Principal component analysis
; Rain
; Troposphere
; East Asian summer monsoon
; Empirical orthogonal function analysis
; Extratropical circulation
; Intraseasonal oscillations
; Principal Components
; subtropical monsoon
; Westerly jet streams
; Western North Pacific
; Tropics
; convection
; jet stream
; life cycle
; moisture transfer
; monsoon
; oscillation
; rainfall
; summer
; trough
; westerly
; Far East
; Pacific Ocean
; Pacific Ocean (North)
; South China Sea
; Citrus maxima
英文摘要: The impact of quasi-biweekly oscillation (QBWO) over the western North Pacific on East Asian summer monsoon (EASM) is investigated. The life cycle of QBWO is divided into eight phases defined by the two leading principal components (PC1 and PC2) of an empirical orthogonal function analysis. Subtropical rainfall shows significant changes, with a northwestward propagation of convection from equatorial regions to the South China Sea (SCS). The most significant variations occur in QBWO phases 3 and 4 (enhanced convection over SCS) and phases 7 and 8 (reduced convection over SCS). The East Asia Mei-yu significantly decreases in QBWO phases 3 and 4 but increases in phases 7 and 8. The QBWO influences EASM through modulating the subtropical monsoon flow and extratropical circulation. The response of lower tropospheric atmosphere to QBWO shows a northwestward propagation and a downstream wave train that extends northward into the western North Pacific, modulating the SCS monsoon trough and the EASM flow associated with moisture transportation. The mid-tropospheric extratropical circulation and the western Pacific subtropical high also show obvious changes accompanying QBWO evolution, resulting in circulation patterns associated with cold air activity. Moreover, changes with QBWO are found in the upper tropospheric East Asian westerly jet stream and the South Asian high, and these changes contribute to upper level divergence over subtropical East Asia. Key Points Quasi-biweekly oscillation modulates subtropical monsoonCharacteristics and effect on rainfall are phase dependentThe South Asian High is important for QBWO ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 40905035
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63716
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: National Climate Center, China Meteorological Administration, Beijing, China; Department of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
Recommended Citation:
Jia X.,Yang S.. Impact of the quasi-biweekly oscillation over the western North Pacific on East Asian subtropical monsoon during early summer[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)