Three-Dimensional Structure of Optimal Nonlinear Excitation for Decadal Variability of the Thermohaline Circulation

IOCAS-IR

	Three-Dimensional Structure of Optimal Nonlinear Excitation for Decadal Variability of the Thermohaline Circulation
	ZU Zi-Qing ; MU Mu ; Henk A.DIJKSTRA
发表期刊	Atmospheric and Oceanic Science Letters
ISSN	1674-2834
	2013-11-16
出版年	2013
卷号	v.6 期号:06 页码:8-14
文献类型	CNKI期刊论文
摘要	The decadal variability of the North Atlantic thermohaline circulation(THC) is investigated within a three-dimensional ocean circulation model using the conditional nonlinear optimal perturbation method. The results show that the optimal initial perturbations of temperature and salinity exciting the strongest decadal THC variations have similar structures: the perturbations are mainly in the northwestern basin at a depth ranging from 1500 to 3000 m. These temperature and salinity perturbations act as the optimal precursors for future modifications of the THC, highlighting the importance of observations in the northwestern basin to monitor the variations of temperature and salinity at depth. The decadal THC variation in the nonlinear model initialized by the optimal salinity perturbations is much stronger than that caused by the optimal temperature perturbations, indicating that salinity variations might play a relatively important role in exciting the decadal THC variability. Moreover, the decadal THC variations in the tangent linear and nonlinear models show remarkably different characteristics, suggesting the importance of nonlinear processes in the decadal variability of the THC.
关键词	thermohaline circulation decadal variability conditional nonlinear optimal perturbation optimal precursor nonlinear processes
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A009;
CNKI专题名称	气象学;
分类号	P434
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	supported by the National Basic Research Program of China(973 Program,Grant No.2012CB417404)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/190652
专题	中国科学院海洋研究所
作者单位	1.StateKeyLaboratoryofNumericalModelingforAtmosphericSciencesandGeophysicalFluidDynamics(LASG),InstituteofAtmosphericPhysics,ChineseAcademyofSciences 2.UniversityofChineseAcademyofSciences 3.KeyLaboratoryofOceanCirculationandWave,InstituteofOceanology,ChineseAcademyofSciences 4.InstituteforMarineandAtmosphericResearchUtrecht,DepartmentofPhysicsandAstronomy,UtrechtUniversity
推荐引用方式 GB/T 7714	ZU Zi-Qing,MU Mu,Henk A.DIJKSTRA. Three-Dimensional Structure of Optimal Nonlinear Excitation for Decadal Variability of the Thermohaline Circulation. 2013.