DOI: 10.1175/JCLI-D-12-00648.1
Scopus记录号: 2-s2.0-84881659649
论文题名: Generation mechanism of the South Pacific subtropical dipole
作者: Morioka Y. ; Ratnam J.V. ; Sasaki W. ; Masumoto Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 16 起始页码: 6033
结束页码: 6045
语种: 英语
Scopus关键词: Coupled general circulation models
; Empirical Orthogonal Function
; Generation mechanism
; Geopotential height anomalies
; Interannual variability
; Sea level pressure
; Sea surface temperature (SST)
; Short-wave radiation
; Atmospheric temperature
; Sea level
; Climate change
; air-sea interaction
; atmosphere-ocean coupling
; climatology
; empirical analysis
; heat balance
; Rossby wave
; sea level pressure
; sea surface temperature
; shortwave radiation
; temperature anomaly
; troposphere
; westerly
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: Distinct pattern of interannual variability in sea surface temperature (SST) in the South Pacific [i.e., the South Pacific subtropical dipole (SPSD)] is examined using outputs from a coupled general circulation model. The SPSD appears as the second empirical orthogonal function (EOF) mode of the SST anomalies in the South Pacific and is associated with a northeast-southwest-oriented dipole of positive and negative SST anomalies in the central basin. The positive and negative SST anomaly poles start to develop during austral spring, reach their peak during austral summer, and gradually decay afterward. Close examination of mixedlayer heat balance yields that the SST anomaly poles develop mainly because warming of the mixed layer by shortwave radiation is modulated by the anomalous mixed-layer thickness. Over the positive (negative) pole, the mixed layer becomes thinner (thicker) than normal and acts to enhance (reduce) the warming of the mixed layer by climatological shortwave radiation. This thinner (thicker) mixed layer may be related to the suppressed (enhanced) evaporation associated with the overlying sea level pressure (SLP) anomalies. Weaker-than-normal surface wind also contributes to the thinner mixed layer in the case of the positive pole. Furthermore, the SLP anomalies are linked with the geopotential height anomalies in the upper troposphere and are associated with a stationary Rossby wave pattern along the westerly jet in the midlatitudes. This suggests that the SLP anomalies that generate the SPSD are not locally excited but remotely induced signals. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51741
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Research Institute for Global Change, JAMSTEC, Yokohama, Japan; Application Laboratory, JAMSTEC, Yokohama, Japan; Research Institute for Global Change, JAMSTEC, Yokohama, Japan
Recommended Citation:
Morioka Y.,Ratnam J.V.,Sasaki W.,et al. Generation mechanism of the South Pacific subtropical dipole[J]. Journal of Climate,2013-01-01,26(16)