DOI: 10.1007/s00382-016-3405-z
Scopus记录号: 2-s2.0-84992025547
论文题名: Impacts of the tropical trans-basin variability on Australian rainfall
作者: Choudhury D. ; Sen Gupta A. ; Sharma A. ; Taschetto A.S. ; Mehrotra R. ; Sivakumar B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-05-06 起始页码: 1617
结束页码: 1629
语种: 英语
英文关键词: Australian rainfall
; El Niño Southern Oscillation
; Rainfall prediction
; Tropical trans-basin variability (TBV)
英文摘要: A large-scale mode of sea level pressure variability between the Pacific and Atlantic basins—referred to as the tropical trans-basin variability (TBV)—has shown multi-year predictability beyond that normally associated with El Niño Southern Oscillation (ENSO). Here we examine the relationship between the TBV and regional rainfall, which, if significant, would imply that the TBV predictability could be used to improve rainfall forecasts. We find TBV to be significantly related to rainfall, a relationship that is strongest over Australia during spring. We find Australia to experience drier conditions during the positive phase of TBV and wetter conditions during the negative phase, a pattern similar to that of ENSO. Furthermore, TBV is associated with rainfall responses that are of similar magnitude to ENSO, but there is some degree of independence between TBV and the Pacific modes defined by sea surface temperature indices. The global teleconnections related to the different TBV phases suggest that though many TBV and ENSO events overlap, pure ENSO events are primarily driven by the Pacific whereas pure TBV events are driven by the Atlantic Ocean. An El Niño coupled with a positive TBV event leads to significant drying over the east coast of Australia while the combined negative phase leads to widespread wetting over most of the country, which can be attributed to an enhancement of the anomalous Walker Circulation and the resulting moisture convergence and wind patterns. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: ARC, Australian Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53098
Appears in Collections: 过去全球变化的重建
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作者单位: School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia; ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, Australia; Climate Change Research Centre, University of New South Wales, Sydney, Australia; Department of Land, Air and Water Resources, University of California, Davis, United States
Recommended Citation:
Choudhury D.,Sen Gupta A.,Sharma A.,et al. Impacts of the tropical trans-basin variability on Australian rainfall[J]. Climate Dynamics,2017-01-01,49(2017-05-06)