DOI: 10.1175/JCLI-D-12-00861.1
Scopus记录号: 2-s2.0-84888032307
论文题名: Zonal oscillation of Western Pacific subtropical high and subseasonal SST variations during Yangtze persistent heavy rainfall events
作者: Ren X. ; Yang X.-Q. ; Sun X.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 22 起始页码: 8929
结束页码: 8946
语种: 英语
Scopus关键词: Anticyclonic anomalies
; Atmosphere-ocean interactions
; Convective instabilities
; Geo-potential heights
; Intraseasonal variability
; Middle and lower reaches of the yangtze rivers
; Monsoons
; Sea surface temperature (SST)
; Atmospheric thermodynamics
; Climate change
; Coastal zones
; Rain
; Oceanography
; air-sea interaction
; anticyclone
; atmosphere-ocean coupling
; geopotential
; latent heat flux
; monsoon
; rainfall
; sea surface temperature
; seasonal variation
; zonal wind
; China
; Pacific Ocean
; Pacific Ocean (West)
; Yangtze Valley
英文摘要: This study examines the relationship between the zonal oscillation of the western Pacific subtropical high (WPSH) and underneath sea surface temperature (SST) variation on a subseasonal time scale, associated with the persistent heavy rainfall (PHR) events over the middle and lower reaches of the Yangtze River valley (MLYRV) in China. A total of 76 PHR events and 45 break events in the summers of 1979-2011 are first identified over the MLYRV and divided into early and late summer groups. During the PHR events over the MLYRV for both groups, the WPSH stretches more westward, accompanied by the positive anomalies of the 500-hPa geopotential height field over East Asia and its coastal region south of 30°N and the subseasonal warmer SSTs beneath the WPSH western edge. The time-lagged composites suggest that the WPSH western edge exhibits westward-then-eastward migration on a subseasonal time scale for the PHR events. The zonal changes of the WPSH and anomalous circulation and SST anomaly (SSTA) signals for break events is almost the mirror image of that for the PHR events for the early summer group. Accompanied by the WPSH westward extension, the increased incident solar radiation and decreased latent heat flux over the coastal region of East Asia contribute to the positive SSTAs beneath the western part of the WPSH. The positive SSTAs construct a convective instability that provides an adverse condition for maintaining the anticyclonic anomalies in the mid-lower levels. The persistent SST warming is also favorable to the transition of low-level circulation from anticyclonic to cyclonic anomalies over the coastal region. As a result, the WPSH withdraws eastward after the peak of the rainfall events over the MLYRV. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51561
Appears in Collections: 气候变化事实与影响
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作者单位: Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, China
Recommended Citation:
Ren X.,Yang X.-Q.,Sun X.. Zonal oscillation of Western Pacific subtropical high and subseasonal SST variations during Yangtze persistent heavy rainfall events[J]. Journal of Climate,2013-01-01,26(22)