Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation

doi:10.1007/s00343-014-3051-4

IOCAS-IR > 海洋环流与波动重点实验室

	Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation
	Zu Ziqing 1,4; Mu Mu 1,2; Dijkstra, Henk A.3; Mu, M
	2013-11-01
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	0254-4059
卷号	31 期号:6 页码:1356-1362
文章类型	Article
摘要	Nonlinear development of salinity perturbations in the Atlantic thermohaline circulation (THC) is investigated with a three-dimensional ocean circulation model, using the conditional nonlinear optimal perturbation method. The results show two types of optimal initial perturbations of sea surface salinity, one associated with freshwater and the other with salinity. Both types of perturbations excite decadal variability of the THC. Under the same amplitude of initial perturbation, the decadal variation induced by the freshwater perturbation is much stronger than that by the salinity perturbation, suggesting that the THC is more sensitive to freshwater than salinity perturbation. As the amplitude of initial perturbation increases, the decadal variations become stronger for both perturbations. For salinity perturbations, recovery time of the THC to return to steady state gradually saturates with increasing amplitude, whereas this recovery time increases remarkably for freshwater perturbations. A nonlinear (advective) feedback between density and velocity anomalies is proposed to explain these characteristics of decadal variability excitation. The results are consistent with previous ones from simple box models, and highlight the importance of nonlinear feedback in decadal THC variability.; Nonlinear development of salinity perturbations in the Atlantic thermohaline circulation (THC) is investigated with a three-dimensional ocean circulation model, using the conditional nonlinear optimal perturbation method. The results show two types of optimal initial perturbations of sea surface salinity, one associated with freshwater and the other with salinity. Both types of perturbations excite decadal variability of the THC. Under the same amplitude of initial perturbation, the decadal variation induced by the freshwater perturbation is much stronger than that by the salinity perturbation, suggesting that the THC is more sensitive to freshwater than salinity perturbation. As the amplitude of initial perturbation increases, the decadal variations become stronger for both perturbations. For salinity perturbations, recovery time of the THC to return to steady state gradually saturates with increasing amplitude, whereas this recovery time increases remarkably for freshwater perturbations. A nonlinear (advective) feedback between density and velocity anomalies is proposed to explain these characteristics of decadal variability excitation. The results are consistent with previous ones from simple box models, and highlight the importance of nonlinear feedback in decadal THC variability.
关键词	Thermohaline Circulation Decadal Variability Conditional Nonlinear Optimal Perturbation Nonlinear Advective Feedback
学科领域	Marine & Freshwater Biology ; Oceanography
DOI	10.1007/s00343-014-3051-4
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:000326628800023
WOS关键词	SURFACE SALINITY PERTURBATIONS ; OCEAN CIRCULATION ; GLOBAL OCEAN ; MODEL ; CLIMATE ; PREDICTABILITY ; PREDICTION ; STABILITY ; OSCILLATION ; SENSITIVITY
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16424
专题	海洋环流与波动重点实验室
通讯作者	Mu, M
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Key Lab Ocean Circulat & Wave, Inst Oceanol, Qingdao 266071, Peoples R China 3.Univ Utrecht, Dept Phys & Astron, Inst Marine & Atmospher Res Utrecht, NL-3584 CC Utrecht, Netherlands 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zu Ziqing,Mu Mu,Dijkstra, Henk A.,et al. Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2013,31(6):1356-1362.
APA	Zu Ziqing,Mu Mu,Dijkstra, Henk A.,&Mu, M.(2013).Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,31(6),1356-1362.
MLA	Zu Ziqing,et al."Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 31.6(2013):1356-1362.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Optimal nonlinear ex（417KB）			限制开放	CC BY-NC-SA	浏览