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Exploring the Phase-Strength Asymmetry of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation
Jiang Zhina; Wang Xin; Wang Donghai; jzn@cams.cma.gov.cn
2015
Source PublicationADVANCES IN ATMOSPHERIC SCIENCES
Volume32Issue:5Pages:671-679
Subtype0256-1530
AbstractNegative-phase North Atlantic Oscillation (NAO) events are generally stronger than positive-phase ones, i.e., there is a phase-strength asymmetry of the NAO. In this work, we explore this asymmetry of the NAO using the conditional nonlinear optimal perturbation (CNOP) method with a three-level global quasi-geostrophic spectral model. It is shown that, with winter climatological flow forcing, the CNOP method identifies the perturbations triggering the strongest NAO event under a given initial constraint. Meanwhile, the phase-strength asymmetry characteristics of the NAO can be revealed. By comparing with linear results, we find that the process of perturbation self-interaction promotes the onset of negative NAO events, which is much stronger than during positive NAO onset. Results are obtained separately using the climatological and zonal-mean flows in boreal winter (December-February) 1979-2006 as the initial basic state. We conclude, based on the fact that NAO onset is a nonlinear initial-value problem, that phase-strength asymmetry is an intrinsic characteristic of the NAO.
Department[Jiang Zhina; Wang Donghai] Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing 100081, Peoples R China; [Wang Xin] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; LTO
KeywordNorth Atlantic Oscillation Asymmetry Optimization Problem
Subject AreaMeteorology & Atmospheric Sciences
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15098
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorjzn@cams.cma.gov.cn
Recommended Citation
GB/T 7714
Jiang Zhina,Wang Xin,Wang Donghai,et al. Exploring the Phase-Strength Asymmetry of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2015,32(5):671-679.
APA Jiang Zhina,Wang Xin,Wang Donghai,&jzn@cams.cma.gov.cn.(2015).Exploring the Phase-Strength Asymmetry of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation.ADVANCES IN ATMOSPHERIC SCIENCES,32(5),671-679.
MLA Jiang Zhina,et al."Exploring the Phase-Strength Asymmetry of the North Atlantic Oscillation Using Conditional Nonlinear Optimal Perturbation".ADVANCES IN ATMOSPHERIC SCIENCES 32.5(2015):671-679.
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