Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation
文献类型：CNKI期刊论文
| 作者 | Zu ZQ(祖子清); Mu M(穆穆); Henk A.DIJKSTRA |
| 发表日期 | 2013-11-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | thermohaline circulation decadal variability conditional nonlinear optimal perturbation nonlinear advective feedback |
| 英文摘要 | 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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Basic Research Program of China(973 Program)(No.2012CB417404) |
| 卷 | v.31期:06页:196-202 |
| 语种 | 英文; |
| 分类号 | P731 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190667]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.InstituteforMarineandAtmosphericResearchUtrecht,DepartmentofPhysicsandAstronomy,UtrechtUniversity 2.UniversityofChineseAcademyofSciences 3.KeyLaboratoryofOceanCirculationandWave,InstituteofOceanology,ChineseAcademyofSciences 4.LASG,InstituteofAtmosphericPhysics,ChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Zu ZQ,Mu M,Henk A.DIJKSTRA. Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation. 2013. |
入库方式： OAI收割
来源：海洋研究所
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