The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking
	Duan WanSuo 1; Zhang Rui1,2 ; Yu YanShan 3; Tian Ben 1,2
刊名	SCIENCE CHINA-EARTH SCIENCES
	2013-11-01
卷号	56 期号:11 页码:1988-1996
关键词	El Nino event nonlinearity optimal perturbation numerical model
ISSN号	1674-7313
通讯作者	Duan, WS
中文摘要	We use conditional nonlinear optimal perturbation (CNOP) to investigate the optimal precursory disturbances in the Zebiak-Cane El Nino-Southern Oscillation (ENSO) model. The conditions of the CNOP-type precursors are highly likely to evolve into El Nino events in the Zebiak-Cane model. By exploring the dynamic behaviors of these nonlinear El Nino events caused by the CNOP-type precursors, we find that they, as expected, tend to phase-lock to the annual cycles in the Zebiak-Cane model, with the SSTA peak at the end of a calendar year. However, El Nino events with CNOPs as initial anomalies in the linearized Zebiak-Cane model are inclined to phase-lock earlier than nonlinear El Nino events despite the existence of annual cycles in the model. It is clear that nonlinearities play an important role in El Nino's phase-locking. In particular, nonlinear temperature advection increases anomalous zonal SST differences and anomalous westerlies, which weakens anomalous upwelling and acts on the increasing anomalous vertical temperature difference and, as a result, enhances El Nino and then delays the peak SSTA. Finally, we demonstrate that nonlinear temperature advection, together with the effect of the annual cycle, causes El Nino events to peak at the end of the calendar year.
英文摘要	We use conditional nonlinear optimal perturbation (CNOP) to investigate the optimal precursory disturbances in the Zebiak-Cane El Nino-Southern Oscillation (ENSO) model. The conditions of the CNOP-type precursors are highly likely to evolve into El Nino events in the Zebiak-Cane model. By exploring the dynamic behaviors of these nonlinear El Nino events caused by the CNOP-type precursors, we find that they, as expected, tend to phase-lock to the annual cycles in the Zebiak-Cane model, with the SSTA peak at the end of a calendar year. However, El Nino events with CNOPs as initial anomalies in the linearized Zebiak-Cane model are inclined to phase-lock earlier than nonlinear El Nino events despite the existence of annual cycles in the model. It is clear that nonlinearities play an important role in El Nino's phase-locking. In particular, nonlinear temperature advection increases anomalous zonal SST differences and anomalous westerlies, which weakens anomalous upwelling and acts on the increasing anomalous vertical temperature difference and, as a result, enhances El Nino and then delays the peak SSTA. Finally, we demonstrate that nonlinear temperature advection, together with the effect of the annual cycle, causes El Nino events to peak at the end of the calendar year.
学科主题	Geology
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geosciences, Multidisciplinary
研究领域[WOS]	Geology
关键词[WOS]	OCEAN-ATMOSPHERE MODEL ; SOUTHERN-OSCILLATION ; SEASONAL CYCLE ; OPTIMAL PERTURBATION ; RECHARGE PARADIGM ; ENSO ; PREDICTABILITY ; PREDICTION ; CHAOS ; VARIABILITY
收录类别	SCI
原文出处	10.1007/s11430-013-4629-y
语种	英语
WOS记录号	WOS:000326459500017
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16320]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Ocean, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Duan WanSuo,Zhang Rui,Yu YanShan,et al. The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking[J]. SCIENCE CHINA-EARTH SCIENCES,2013,56(11):1988-1996.
APA	Duan WanSuo,Zhang Rui,Yu YanShan,&Tian Ben.(2013).The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking.SCIENCE CHINA-EARTH SCIENCES,56(11),1988-1996.
MLA	Duan WanSuo,et al."The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking".SCIENCE CHINA-EARTH SCIENCES 56.11(2013):1988-1996.