IOCAS-IR  > 海洋环流与波动重点实验室
The onset of the 1991-92 El Nino event in the tropical Pacific Ocean: The NECC subsurface pathway
Zhang Ronghua; Rothste Lewis M.; . Busalacc Antonio J.; Liang Xinzhong
1999-04-01
Source PublicationGEOPHYSICAL RESEARCH LETTERS
Volume26Issue:7Pages:847-850
Abstract    Based on the NCEP ocean re-analysis data, the three-dimensional co-evolution of the tropical Pacific climate system is examined to explain the onset of the 1991-92 El Nino event. A logical sequence is discovered that links subsurface and surface temperature anomalies off and on the equator in the western and central Pacific. Along the North Equatorial Countercurrent (NECC) path, subsurface temperature anomalies propagated coherently eastward from the western boundary in mid-1989 to the date line in mid-1990, at a speed of about 10-20 cm(-1). As the thermocline shoals eastward along the NECC, the subsurface anomalies outcropped in the regions near the date line, initiating warm sea surface temperature (SST) anomalies which further amplified while advectively extending into the equatorial wave guide. These subsurface-induced SST anomalies could then trigger local coupled air-sea interactions producing atmospheric-oceanic anomalies that developed and evolved in 1991, thus setting onset conditions for the 1991-92 El Nino. These results differ markedly from the delayed oscillator physics in that a major role can be played by the eastward advection of off-equatorial subsurface thermal anomalies and their outcropping along the NECC subsurface pathways, not necessarily involving wave reflections along the western boundary for triggering El Nino. This mechanism explains well the observed, otherwise unaccounted for, surface warming near the date lint: during late 1989 and early 1990.
KeywordSouthern Oscillation Interannual Variability Model System Waves Enso
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/18163
Collection海洋环流与波动重点实验室
Recommended Citation
GB/T 7714
Zhang Ronghua,Rothste Lewis M.,. Busalacc Antonio J.,et al. The onset of the 1991-92 El Nino event in the tropical Pacific Ocean: The NECC subsurface pathway[J]. GEOPHYSICAL RESEARCH LETTERS,1999,26(7):847-850.
APA Zhang Ronghua,Rothste Lewis M.,. Busalacc Antonio J.,&Liang Xinzhong.(1999).The onset of the 1991-92 El Nino event in the tropical Pacific Ocean: The NECC subsurface pathway.GEOPHYSICAL RESEARCH LETTERS,26(7),847-850.
MLA Zhang Ronghua,et al."The onset of the 1991-92 El Nino event in the tropical Pacific Ocean: The NECC subsurface pathway".GEOPHYSICAL RESEARCH LETTERS 26.7(1999):847-850.
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