Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation
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 sal...
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/16424 2023-05-15T17:35:56+02:00 Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation Zu Ziqing Mu Mu Dijkstra, Henk A. Mu, M 2013-11-01 http://ir.qdio.ac.cn/handle/337002/16424 https://doi.org/10.1007/s00343-014-3051-4 英语 eng CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY Zu Ziqing; Mu Mu; Dijkstra, Henk A.Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation,CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2013,31(6):1356-1362 http://ir.qdio.ac.cn/handle/337002/16424 doi:10.1007/s00343-014-3051-4 6 Thermohaline Circulation Decadal Variability Conditional Nonlinear Optimal Perturbation Nonlinear Advective Feedback Marine & Freshwater Biology Oceanography Limnology Science & Technology Life Sciences & Biomedicine Physical Sciences SURFACE SALINITY PERTURBATIONS OCEAN CIRCULATION GLOBAL OCEAN MODEL CLIMATE PREDICTABILITY PREDICTION STABILITY OSCILLATION SENSITIVITY Article 期刊论文 2013 ftchinacasciocas https://doi.org/10.1007/s00343-014-3051-4 2022-06-27T05:35:33Z 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, ... Article in Journal/Newspaper North Atlantic North atlantic Thermohaline circulation Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Chinese Journal of Oceanology and Limnology 31 6 1368 1374 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Thermohaline Circulation Decadal Variability Conditional Nonlinear Optimal Perturbation Nonlinear Advective Feedback Marine & Freshwater Biology Oceanography Limnology Science & Technology Life Sciences & Biomedicine Physical Sciences SURFACE SALINITY PERTURBATIONS OCEAN CIRCULATION GLOBAL OCEAN MODEL CLIMATE PREDICTABILITY PREDICTION STABILITY OSCILLATION SENSITIVITY |
spellingShingle |
Thermohaline Circulation Decadal Variability Conditional Nonlinear Optimal Perturbation Nonlinear Advective Feedback Marine & Freshwater Biology Oceanography Limnology Science & Technology Life Sciences & Biomedicine Physical Sciences SURFACE SALINITY PERTURBATIONS OCEAN CIRCULATION GLOBAL OCEAN MODEL CLIMATE PREDICTABILITY PREDICTION STABILITY OSCILLATION SENSITIVITY Zu Ziqing Mu Mu Dijkstra, Henk A. Mu, M Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation |
topic_facet |
Thermohaline Circulation Decadal Variability Conditional Nonlinear Optimal Perturbation Nonlinear Advective Feedback Marine & Freshwater Biology Oceanography Limnology Science & Technology Life Sciences & Biomedicine Physical Sciences SURFACE SALINITY PERTURBATIONS OCEAN CIRCULATION GLOBAL OCEAN MODEL CLIMATE PREDICTABILITY PREDICTION STABILITY OSCILLATION SENSITIVITY |
description |
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, ... |
format |
Article in Journal/Newspaper |
author |
Zu Ziqing Mu Mu Dijkstra, Henk A. Mu, M |
author_facet |
Zu Ziqing Mu Mu Dijkstra, Henk A. Mu, M |
author_sort |
Zu Ziqing |
title |
Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation |
title_short |
Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation |
title_full |
Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation |
title_fullStr |
Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation |
title_full_unstemmed |
Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation |
title_sort |
optimal nonlinear excitation of decadal variability of the north atlantic thermohaline circulation |
publishDate |
2013 |
url |
http://ir.qdio.ac.cn/handle/337002/16424 https://doi.org/10.1007/s00343-014-3051-4 |
genre |
North Atlantic North atlantic Thermohaline circulation |
genre_facet |
North Atlantic North atlantic Thermohaline circulation |
op_relation |
CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY Zu Ziqing; Mu Mu; Dijkstra, Henk A.Optimal nonlinear excitation of decadal variability of the North Atlantic thermohaline circulation,CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2013,31(6):1356-1362 http://ir.qdio.ac.cn/handle/337002/16424 doi:10.1007/s00343-014-3051-4 |
op_rights |
6 |
op_doi |
https://doi.org/10.1007/s00343-014-3051-4 |
container_title |
Chinese Journal of Oceanology and Limnology |
container_volume |
31 |
container_issue |
6 |
container_start_page |
1368 |
op_container_end_page |
1374 |
_version_ |
1766135229325508608 |