A Study of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation

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	A Study of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation
	Jiang, Zhina 1; Mu, Mu 2,3; Luo, Dehai 4
刊名	JOURNAL OF THE ATMOSPHERIC SCIENCES
	2013-03-01
卷号	70 期号:3 页码:855-875
ISSN号	0022-4928
通讯作者	Jiang, ZN
中文摘要	The conditional nonlinear optimal perturbation (CNOP) method is used to explore the optimal precursors that trigger the North Atlantic Oscillation (NAO) anomaly pattern with a triangular T21, three-level, quasi-geostrophic global spectral model based on a viewpoint that the NAO is a nonlinear initial-value problem. With a three-dimensional winter climatological flow as the basic state, initially baroclinic localized optimal precursors on the northward flanks of the climatological Atlantic jet undergo wave breaking during their evolution into the NAO-like anomalies. Accompanied with the formation of the NAO, the north-south variability of the zonal mean westerly anomaly has arisen. Analysis reveals that in the evolution of optimal precursors, the role played by the self-interaction of perturbations (viz., the nonlinear process) in the onset of the negative-phase NAO (NAO 2) event is stronger than that in the onset of the positive-phase NAO (NAO 1) event. Both the perturbation/ basic-state interaction and self-interaction of perturbations determine whether the NAO 2 event occurs, whereas the nonlinearity process in the NAO 1 onset only appears to modulate the structure of the perturbation to have a dipole mode over the North Atlantic at the optimization time, and meanwhile cause this dipole mode to become zonally extended. That is to say, the nonlinear process indeed plays an important role during the onset of an NAO event and the CNOP method is a useful tool to identify the dynamics of the onset of NAO teleconnection patterns.
英文摘要	The conditional nonlinear optimal perturbation (CNOP) method is used to explore the optimal precursors that trigger the North Atlantic Oscillation (NAO) anomaly pattern with a triangular T21, three-level, quasi-geostrophic global spectral model based on a viewpoint that the NAO is a nonlinear initial-value problem. With a three-dimensional winter climatological flow as the basic state, initially baroclinic localized optimal precursors on the northward flanks of the climatological Atlantic jet undergo wave breaking during their evolution into the NAO-like anomalies. Accompanied with the formation of the NAO, the north-south variability of the zonal mean westerly anomaly has arisen.
学科主题	Meteorology & Atmospheric Sciences
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Meteorology & Atmospheric Sciences
研究领域[WOS]	Meteorology & Atmospheric Sciences
关键词[WOS]	FREQUENCY DIPOLE MODES ; TELECONNECTION PATTERNS ; ANNULAR MODES ; PART I ; DYNAMICS ; BLOCKING ; NAO ; VARIABILITY ; WAVE ; ANOMALIES
收录类别	SCI
原文出处	10.1175/JAS-D-12-0148.1
语种	英语
WOS记录号	WOS:000315811300008
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16390]
专题	海洋研究所_海洋环流与波动重点实验室
作者单位	1.Chinese Acad Meteorol Sci, State Key Lab Severe Weather LaSW, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Wave, Qingdao, Peoples R China 3.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Atmospher Phys, RCE TEA, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Zhina,Mu, Mu,Luo, Dehai. A Study of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2013,70(3):855-875.
APA	Jiang, Zhina,Mu, Mu,&Luo, Dehai.(2013).A Study of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation.JOURNAL OF THE ATMOSPHERIC SCIENCES,70(3),855-875.
MLA	Jiang, Zhina,et al."A Study of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation".JOURNAL OF THE ATMOSPHERIC SCIENCES 70.3(2013):855-875.