Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation
文献类型：期刊论文
| 作者 | Zu Ziqing1,4; Mu Mu1,2; Dijkstra, Henk A.3 |
| 刊名 | CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
 |
| 出版日期 | 2013-11-01 |
| 卷号 | 31期号:6页码:1356-1362 |
| 关键词 | thermohaline circulation decadal variability conditional nonlinear optimal perturbation nonlinear advective feedback |
| ISSN号 | 0254-4059 |
| 通讯作者 | Mu, M |
| 中文摘要 | 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. |
| 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. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences |
| 学科主题 | Marine & Freshwater Biology ; Oceanography |
| 类目[WOS] | Limnology ; Oceanography |
| 研究领域[WOS] | Marine & Freshwater Biology ; Oceanography |
| 关键词[WOS] | SURFACE SALINITY PERTURBATIONS ; OCEAN CIRCULATION ; GLOBAL OCEAN ; MODEL ; CLIMATE ; PREDICTABILITY ; PREDICTION ; STABILITY ; OSCILLATION ; SENSITIVITY |
| 收录类别 | SCI |
| 原文出处 | 10.1007/s00343-014-3051-4 |
| 语种 | 英语 |
| WOS记录号 | WOS:000326628800023 |
| 公开日期 | 2014-07-17 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/16424]  |
| 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, 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.. 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..(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. |
入库方式： OAI收割
来源：海洋研究所
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