Effects of nonlinear physical processes on optimal error growth in predictability experiments of the Kuroshio Large Meander

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	Effects of nonlinear physical processes on optimal error growth in predictability experiments of the Kuroshio Large Meander
	Wang, Qiang 1,2; Mu, Mu 1; Dijkstra, Henk A.3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2013-12-01
卷号	118 期号:12 页码:6425-6436
关键词	error growth Kuroshio large meander CNOP singular vector
ISSN号	2169-9275
通讯作者	Mu, M
中文摘要	Within a 1.5-layer shallow-water model, the effects of nonlinear physical processes on the optimal error growth in the predictability experiments of the Kuroshio Large Meander (LM) are investigated. To clarify these effects, we use both the conditional nonlinear optimal perturbation (CNOP) and the first singular vector (FSV) methods. By examining the nonlinear evolution of the CNOPs and the FSVs, we find that the nonlinear physical processes play an important role in the error growth, in particular for the initial errors with large amplitudes. The specific roles of nonlinear processes in error growth are identified by determining the error development in modified nonlinear equations in which particular terms are neglected. The results demonstrate that advection of momentum perturbations, associated with the nonlinear development of barotropic instabilities, tend to enhance the evolution of the errors and cause the forecasted Kuroshio Large Meander to be strengthened. The nonlinear process related to the divergence of velocity perturbations caused by upper-layer thickness perturbations enhances the optimal error growth, whereas the advection of upper-layer thickness perturbations by velocity perturbations suppresses it.
英文摘要	Within a 1.5-layer shallow-water model, the effects of nonlinear physical processes on the optimal error growth in the predictability experiments of the Kuroshio Large Meander (LM) are investigated. To clarify these effects, we use both the conditional nonlinear optimal perturbation (CNOP) and the first singular vector (FSV) methods. By examining the nonlinear evolution of the CNOPs and the FSVs, we find that the nonlinear physical processes play an important role in the error growth, in particular for the initial errors with large amplitudes. The specific roles of nonlinear processes in error growth are identified by determining the error development in modified nonlinear equations in which particular terms are neglected. The results demonstrate that advection of momentum perturbations, associated with the nonlinear development of barotropic instabilities, tend to enhance the evolution of the errors and cause the forecasted Kuroshio Large Meander to be strengthened. The nonlinear process related to the divergence of velocity perturbations caused by upper-layer thickness perturbations enhances the optimal error growth, whereas the advection of upper-layer thickness perturbations by velocity perturbations suppresses it.
学科主题	Oceanography
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Oceanography
研究领域[WOS]	Oceanography
关键词[WOS]	RANGE PREDICTION EXPERIMENTS ; PATH VARIABILITIES SOUTH ; DATA-ASSIMILATION ; OPTIMAL PERTURBATION ; WIND STRESS ; JAPAN ; MODEL ; OCEAN ; BIMODALITY ; EXTENSION
收录类别	SCI
原文出处	10.1002/2013JC009276
语种	英语
WOS记录号	WOS:000329926200007
公开日期	2014-07-17
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/16406]
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 Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing, Peoples R China 3.Univ Utrecht, Dept Phys & Astron, Inst Marine & Atmospher Res Utrecht, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Wang, Qiang,Mu, Mu,Dijkstra, Henk A.. Effects of nonlinear physical processes on optimal error growth in predictability experiments of the Kuroshio Large Meander[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2013,118(12):6425-6436.
APA	Wang, Qiang,Mu, Mu,&Dijkstra, Henk A..(2013).Effects of nonlinear physical processes on optimal error growth in predictability experiments of the Kuroshio Large Meander.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,118(12),6425-6436.
MLA	Wang, Qiang,et al."Effects of nonlinear physical processes on optimal error growth in predictability experiments of the Kuroshio Large Meander".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 118.12(2013):6425-6436.