Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations
Highlights • Tobago Basin subsurface temperature and salinity records from ~37 to 30 ka BP. • Cumulative tropical Atlantic upper ocean-atmosphere interactions crucial to functioning of North Brazil Current and Subtropical Gyre. • Rapid re-organizations of the tropical Atlantic upper ocean-atmosphere...
Published in: | Global and Planetary Change |
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Language: | English |
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Elsevier
2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/52477/ https://oceanrep.geomar.de/id/eprint/52477/1/Nu%CC%88rnberg%20et%20al.%20subSSTfinal.pdf https://oceanrep.geomar.de/id/eprint/52477/2/GLOBAL_103497%20Appendix.pdf https://oceanrep.geomar.de/id/eprint/52477/8/Nu%CC%88rnberg%20et%20al.,%202021.pdf https://doi.org/10.1016/j.gloplacha.2021.103497 |
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ftoceanrep:oai:oceanrep.geomar.de:52477 2024-02-11T10:06:45+01:00 Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations Nürnberg, Dirk Riff, Tabitha Bahr, André Karas, Cyrus Meier, Karl Lippold, Jörg 2021-06 text https://oceanrep.geomar.de/id/eprint/52477/ https://oceanrep.geomar.de/id/eprint/52477/1/Nu%CC%88rnberg%20et%20al.%20subSSTfinal.pdf https://oceanrep.geomar.de/id/eprint/52477/2/GLOBAL_103497%20Appendix.pdf https://oceanrep.geomar.de/id/eprint/52477/8/Nu%CC%88rnberg%20et%20al.,%202021.pdf https://doi.org/10.1016/j.gloplacha.2021.103497 en eng Elsevier https://oceanrep.geomar.de/id/eprint/52477/1/Nu%CC%88rnberg%20et%20al.%20subSSTfinal.pdf https://oceanrep.geomar.de/id/eprint/52477/2/GLOBAL_103497%20Appendix.pdf https://oceanrep.geomar.de/id/eprint/52477/8/Nu%CC%88rnberg%20et%20al.,%202021.pdf Nürnberg, D. , Riff, T., Bahr, A., Karas, C., Meier, K. and Lippold, J. (2021) Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations. Open Access Global and Planetary Change, 201 . Art.Nr. 103497. DOI 10.1016/j.gloplacha.2021.103497 <https://doi.org/10.1016/j.gloplacha.2021.103497>. doi:10.1016/j.gloplacha.2021.103497 cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1016/j.gloplacha.2021.103497 2024-01-15T00:23:13Z Highlights • Tobago Basin subsurface temperature and salinity records from ~37 to 30 ka BP. • Cumulative tropical Atlantic upper ocean-atmosphere interactions crucial to functioning of North Brazil Current and Subtropical Gyre. • Rapid re-organizations of the tropical Atlantic upper ocean-atmosphere system at ~32.8 ka BP and ~ 21.8 ka BP. • Thresholds for southward dispersal of Salinity Maximum Water not set during the glacial time period of abrupt climate fluctuations. Abstract Ocean-atmosphere simulations corroborate the relationship between tropical Atlantic subsurface heat and salt storage driven by Salinity Maximum Water (SMW) and deglacial perturbations of the Atlantic Meridional Overturning Circulation (AMOC). Whether AMOC variability of the last glacial cycle affected SMW export into the tropical West Atlantic remained yet elusive. In order to assess the sensitivity of the tropical hydrography during abrupt and rapid glacial climatic and oceanic perturbations, we present century-resolving foraminifera-based subsurface (~200 m water depth) temperature and salinity reconstructions from Tobago Basin core M78/1–235-1. The proxy records were interpreted in terms of the closely related development of the North Brazil Current (NBC) and the North Atlantic Subtropical Gyre (STG) from ~37 to 30 ka BP, and in relation to their deglacial developments. Prior to ~32.8 ka BP, the cyclic variations in subsurface conditions were attributed to the NBC, which acted in line with a recurrent intensification and relaxation of the trade winds, subtle migrations of the Intertropical Convergence Zone, and the related moisture transport across Central America. Major and rapid re-organizations of the tropical Atlantic upper ocean-atmosphere system took place at ~32.8 ka BP and ~ 21.8 ka BP, unmirrored by major AMOC changes. Thresholds for sufficient heat and salinity accumulation in the STG to allow for formation and intensified subsurface dispersal of SMW were not achieved before late HS1, when AMOC weakening, according tropical ... Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Global and Planetary Change 201 103497 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Highlights • Tobago Basin subsurface temperature and salinity records from ~37 to 30 ka BP. • Cumulative tropical Atlantic upper ocean-atmosphere interactions crucial to functioning of North Brazil Current and Subtropical Gyre. • Rapid re-organizations of the tropical Atlantic upper ocean-atmosphere system at ~32.8 ka BP and ~ 21.8 ka BP. • Thresholds for southward dispersal of Salinity Maximum Water not set during the glacial time period of abrupt climate fluctuations. Abstract Ocean-atmosphere simulations corroborate the relationship between tropical Atlantic subsurface heat and salt storage driven by Salinity Maximum Water (SMW) and deglacial perturbations of the Atlantic Meridional Overturning Circulation (AMOC). Whether AMOC variability of the last glacial cycle affected SMW export into the tropical West Atlantic remained yet elusive. In order to assess the sensitivity of the tropical hydrography during abrupt and rapid glacial climatic and oceanic perturbations, we present century-resolving foraminifera-based subsurface (~200 m water depth) temperature and salinity reconstructions from Tobago Basin core M78/1–235-1. The proxy records were interpreted in terms of the closely related development of the North Brazil Current (NBC) and the North Atlantic Subtropical Gyre (STG) from ~37 to 30 ka BP, and in relation to their deglacial developments. Prior to ~32.8 ka BP, the cyclic variations in subsurface conditions were attributed to the NBC, which acted in line with a recurrent intensification and relaxation of the trade winds, subtle migrations of the Intertropical Convergence Zone, and the related moisture transport across Central America. Major and rapid re-organizations of the tropical Atlantic upper ocean-atmosphere system took place at ~32.8 ka BP and ~ 21.8 ka BP, unmirrored by major AMOC changes. Thresholds for sufficient heat and salinity accumulation in the STG to allow for formation and intensified subsurface dispersal of SMW were not achieved before late HS1, when AMOC weakening, according tropical ... |
format |
Article in Journal/Newspaper |
author |
Nürnberg, Dirk Riff, Tabitha Bahr, André Karas, Cyrus Meier, Karl Lippold, Jörg |
spellingShingle |
Nürnberg, Dirk Riff, Tabitha Bahr, André Karas, Cyrus Meier, Karl Lippold, Jörg Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations |
author_facet |
Nürnberg, Dirk Riff, Tabitha Bahr, André Karas, Cyrus Meier, Karl Lippold, Jörg |
author_sort |
Nürnberg, Dirk |
title |
Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations |
title_short |
Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations |
title_full |
Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations |
title_fullStr |
Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations |
title_full_unstemmed |
Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations |
title_sort |
western boundary current in relation to atlantic subtropical gyre dynamics during abrupt glacial climate fluctuations |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/52477/ https://oceanrep.geomar.de/id/eprint/52477/1/Nu%CC%88rnberg%20et%20al.%20subSSTfinal.pdf https://oceanrep.geomar.de/id/eprint/52477/2/GLOBAL_103497%20Appendix.pdf https://oceanrep.geomar.de/id/eprint/52477/8/Nu%CC%88rnberg%20et%20al.,%202021.pdf https://doi.org/10.1016/j.gloplacha.2021.103497 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/52477/1/Nu%CC%88rnberg%20et%20al.%20subSSTfinal.pdf https://oceanrep.geomar.de/id/eprint/52477/2/GLOBAL_103497%20Appendix.pdf https://oceanrep.geomar.de/id/eprint/52477/8/Nu%CC%88rnberg%20et%20al.,%202021.pdf Nürnberg, D. , Riff, T., Bahr, A., Karas, C., Meier, K. and Lippold, J. (2021) Western boundary current in relation to Atlantic Subtropical Gyre dynamics during abrupt glacial climate fluctuations. Open Access Global and Planetary Change, 201 . Art.Nr. 103497. DOI 10.1016/j.gloplacha.2021.103497 <https://doi.org/10.1016/j.gloplacha.2021.103497>. doi:10.1016/j.gloplacha.2021.103497 |
op_rights |
cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2021.103497 |
container_title |
Global and Planetary Change |
container_volume |
201 |
container_start_page |
103497 |
_version_ |
1790604655641755648 |