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Optimal Initial Excitations of Decadal Modification of the Atlantic Meridional Overturning Circulation under the Prescribed Heat and Freshwater Flux Boundary Conditions
Zu, Ziqing1; Mu, Mu2,3; Dijkstra, Henk A.4
2016-07-01
发表期刊JOURNAL OF PHYSICAL OCEANOGRAPHY
卷号46期号:7页码:2029-2047
文章类型Article
摘要Within a three-dimensional ocean circulation model, the nonlinear optimal initial perturbations (NOIP) of sea surface salinity (SSS) and sea surface temperature (SST) to excite variability in the Atlantic meridional overturning circulation (AMOC) were obtained under prescribed heat and freshwater flux boundary conditions, using the conditional nonlinear optimal perturbation (CNOP) method. After 10 years, the optimal SSS and SST perturbations lead to reductions of the AMOC by 3.6 and 2.5 Sv (1 Sv = 10(6) m(3) s(-1)), respectively, followed by multidecadal oscillations with a period of about 50 years. During the first 30 years, nonlinear processes have an important influence on the AMOC strength: convection strengthens the AMOC during years 0-2, zonal density advection promotes the slowdown of the AMOC during years 7-20, and meridional density advection inhibits the slowdown of meridional velocities in the upper ocean during years 5-18. The linear optimal initial perturbation (LOIP) was also computed using the first singular vector (FSV) method. For SSS perturbations with an amplitude of 0.5 psu, the LOIP will cause an underestimation of the amplitude of the multidecadal AMOC variability by about 1 Sv, compared to that induced by the NOIP. This underestimation will become more significant as the amplitudes of SSS perturbations increase.
关键词Circulation Dynamics Meridional Overturning Circulation Nonlinear Dynamics Variability Multidecadal Variability
DOI10.1175/JPO-D-15-0100.1
收录类别SCI
语种英语
WOS记录号WOS:000379656100001
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/130957
专题海洋环流与波动重点实验室
作者单位1.Natl Marine Environm Forecasting Ctr, Key Lab Res Marine Hazards Forecasting, Beijing, Peoples R China
2.Chinese Acad Sci, Key Lab Ocean Circulat & Wave, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao, Peoples R China
4.Univ Utrecht, Inst Marine & Atmospher Res Utrecht, Dept Phys & Astron, Utrecht, Netherlands
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Zu, Ziqing,Mu, Mu,Dijkstra, Henk A.. Optimal Initial Excitations of Decadal Modification of the Atlantic Meridional Overturning Circulation under the Prescribed Heat and Freshwater Flux Boundary Conditions[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2016,46(7):2029-2047.
APA Zu, Ziqing,Mu, Mu,&Dijkstra, Henk A..(2016).Optimal Initial Excitations of Decadal Modification of the Atlantic Meridional Overturning Circulation under the Prescribed Heat and Freshwater Flux Boundary Conditions.JOURNAL OF PHYSICAL OCEANOGRAPHY,46(7),2029-2047.
MLA Zu, Ziqing,et al."Optimal Initial Excitations of Decadal Modification of the Atlantic Meridional Overturning Circulation under the Prescribed Heat and Freshwater Flux Boundary Conditions".JOURNAL OF PHYSICAL OCEANOGRAPHY 46.7(2016):2029-2047.
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