DOI: 10.1007/s00382-015-2525-1
Scopus记录号: 2-s2.0-84947493816
论文题名: A Tripole Index for the Interdecadal Pacific Oscillation
作者: Henley B.J. ; Gergis J. ; Karoly D.J. ; Power S. ; Kennedy J. ; Folland C.K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-11-12 起始页码: 3077
结束页码: 3090
语种: 英语
英文关键词: Interdecadal Pacific Oscillation
; IPO
; Pacific Decadal Oscillation
; Pacific Decadal Variability
; PDO
; PDV
; TPI
英文摘要: A new index is developed for the Interdecadal Pacific Oscillation, termed the IPO Tripole Index (TPI). The IPO is associated with a distinct ‘tripole’ pattern of sea surface temperature anomalies (SSTA), with three large centres of action and variations on decadal timescales, evident in the second principal component (PC) of low-pass filtered global SST. The new index is based on the difference between the SSTA averaged over the central equatorial Pacific and the average of the SSTA in the Northwest and Southwest Pacific. The TPI is an easily calculated, non-PC-based index for tracking decadal SST variability associated with the IPO. The TPI time series bears a close resemblance to previously published PC-based indices and has the advantages of being simpler to compute and more consistent with indices used to track the El Niño–Southern Oscillation (ENSO), such as Niño 3.4. The TPI also provides a simple metric in physical units of °C for evaluating decadal and interdecadal variability of SST fields in a straightforward manner, and can be used to evaluate the skill of dynamical decadal prediction systems. Composites of SST and mean sea level pressure anomalies reveal that the IPO has maintained a broadly stable structure across the seven most recent positive and negative epochs that occurred during 1870–2013. The TPI is shown to be a robust and stable representation of the IPO phenomenon in instrumental records, with relatively more variance in decadal than shorter timescales compared to Niño 3.4, due to the explicit inclusion of off-equatorial SST variability associated with the IPO. © 2015, 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/53910
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth Sciences, University of Melbourne, Parkville, Australia; Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, Australia; Met Office Hadley Centre, Exeter, United Kingdom; Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden
Recommended Citation:
Henley B.J.,Gergis J.,Karoly D.J.,et al. A Tripole Index for the Interdecadal Pacific Oscillation[J]. Climate Dynamics,2015-01-01,45(2017-11-12)