DOI: 10.1175/JCLI-D-12-00458.1
Scopus记录号: 2-s2.0-84877677828
论文题名: Austral summer teleconnections of indo-pacific variability: Their nonlinearity and impacts on australian climate
作者: Cai W. ; van Rensch P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 9 起始页码: 2796
结束页码: 2810
语种: 英语
Scopus关键词: Austral summers
; Indian ocean
; Modulating effect
; Negative phase
; Northern Australia
; Southern Annular Mode
; Teleconnection patterns
; Teleconnections
; Atmospheric pressure
; Ocean currents
; Production platforms
; Rain
; atmospheric convection
; El Nino-Southern Oscillation
; La Nina
; ocean basin
; rainfall
; Rossby wave
; summer
; teleconnection
; tropical meteorology
; Australia
; Indian Ocean
; Indian Ocean (East)
; Pacific Ocean
; Tasman Sea
英文摘要: In austral summer, El Niño-Southern Oscillation (ENSO) covaries with the Indian Ocean Basin Mode (IOBM) and with the southern annular mode (SAM). The present study addresses how the IOBM and the SAM modulate the impact of ENSO on Australia. The authors show that the modulating effect of the SAM is limited; in particular, the SAM does not modify the ENSO teleconnection pattern. However, the IOBM extends ENSO-induced convection anomalies westward over northern Australia and over the eastern Indian Ocean, whereby extending the ENSO tropical teleconnection to the northwest of Australia. The IOBM also generates an equivalent-barotropic Rossby wave train through convection anomalies over northern Australia. The wave train shares an anomaly center over the Tasman Sea latitudes with the Pacific-South American (PSA) pattern, shifting the anomaly center of the PSA pattern to within a closer proximity to Australia. There is a strong asymmetry in the IOBM modulating effect. During an IOBM negative phase, which tends to coincide with La Niñ a events, the rainfall increase is far greater than the reduction during a positive IOBM phase, which tends to coincide with El Niñ o events. This modulation asymmetry is consistent with an asymmetry in the ENSO-rainfall teleconnection over Australia, in which the La Niñ a-rainfall teleconnection is stronger than the El Niñ o-rainfall teleconnection. This asymmetric ENSO-rainfall teleconnection ensures a higher coherence of northern Australia convective anomalies with La Niñ a or with a negative phase of the IOBM, hence a greater modification of the PSA pattern, underpinning the asymmetric modulating role of the IOBM. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51897
Appears in Collections: 气候变化事实与影响
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作者单位: CSIRO Wealth from Oceans Flagship, CSIRO Marine and Atmospheric Research, Aspendale, VIC, Australia
Recommended Citation:
Cai W.,van Rensch P.. Austral summer teleconnections of indo-pacific variability: Their nonlinearity and impacts on australian climate[J]. Journal of Climate,2013-01-01,26(9)