Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016
The Atlantic Meridional Overturning Circulation (AMOC) is a key component of the global climate system through its transport of heat and freshwater. The subpolar North Atlantic (SPNA) is a region where the AMOC is actively developed and shaped though mixing and water mass transformation and where la...
Published in: | Journal of Geophysical Research: Oceans |
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AGU (American Geophysical Union)
2018
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Online Access: | https://oceanrep.geomar.de/id/eprint/43982/ https://oceanrep.geomar.de/id/eprint/43982/1/Holliday_Karstensen_2018.pdf https://doi.org/10.1029/2018JC013841 |
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ftoceanrep:oai:oceanrep.geomar.de:43982 2023-05-15T16:29:45+02:00 Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016 Holliday, N. P. Bacon, S. Cunningham, S. A. Gary, S. F. Karstensen, Johannes King, B. A. Li, F. Mcdonagh, E. L. 2018-07 text https://oceanrep.geomar.de/id/eprint/43982/ https://oceanrep.geomar.de/id/eprint/43982/1/Holliday_Karstensen_2018.pdf https://doi.org/10.1029/2018JC013841 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/43982/1/Holliday_Karstensen_2018.pdf Holliday, N. P., Bacon, S., Cunningham, S. A., Gary, S. F., Karstensen, J. , King, B. A., Li, F. and Mcdonagh, E. L. (2018) Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016. Open Access Journal of Geophysical Research: Oceans, 123 (7). pp. 4538-4559. DOI 10.1029/2018JC013841 <https://doi.org/10.1029/2018JC013841>. doi:10.1029/2018JC013841 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2018 ftoceanrep https://doi.org/10.1029/2018JC013841 2023-04-07T15:40:50Z The Atlantic Meridional Overturning Circulation (AMOC) is a key component of the global climate system through its transport of heat and freshwater. The subpolar North Atlantic (SPNA) is a region where the AMOC is actively developed and shaped though mixing and water mass transformation and where large amounts of heat are released to the atmosphere. Two hydrographic transbasin sections in the summers of 2014 and 2016 provide highly spatially resolved views of the SPNA velocity and property fields on a line from Canada to Greenland to Scotland. Estimates of the AMOC, isopycnal (gyre-scale) transport, and heat and freshwater transport are derived from the observations. The overturning circulation, the maximum in northward transport integrated from the surface to seafloor and computed in density space, has a high range, with 20.6 ± 4.7 Sv in June-July 2014 and 10.6 ± 4.3 Sv in May-August 2016. In contrast, the isopycnal (gyre-scale) circulation was lowest in summer 2014: 41.3 ± 8.2 Sv compared to 58.6 ± 7.4 Sv in 2016. The heat transport (0.39 ± 0.08 PW in summer 2014, positive is northward) was highest for the section with the highest AMOC, and the freshwater transport was largest in summer 2016 when the isopycnal circulation was high (-0.25 ± 0.08 Sv). Up to 65% of the heat and freshwater transport was carried by the isopycnal circulation, with isopycnal property transport highest in the western Labrador Sea and the eastern basins (Iceland Basin to Scotland). Article in Journal/Newspaper Greenland Iceland Labrador Sea North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Canada Greenland Journal of Geophysical Research: Oceans 123 7 4538 4559 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Atlantic Meridional Overturning Circulation (AMOC) is a key component of the global climate system through its transport of heat and freshwater. The subpolar North Atlantic (SPNA) is a region where the AMOC is actively developed and shaped though mixing and water mass transformation and where large amounts of heat are released to the atmosphere. Two hydrographic transbasin sections in the summers of 2014 and 2016 provide highly spatially resolved views of the SPNA velocity and property fields on a line from Canada to Greenland to Scotland. Estimates of the AMOC, isopycnal (gyre-scale) transport, and heat and freshwater transport are derived from the observations. The overturning circulation, the maximum in northward transport integrated from the surface to seafloor and computed in density space, has a high range, with 20.6 ± 4.7 Sv in June-July 2014 and 10.6 ± 4.3 Sv in May-August 2016. In contrast, the isopycnal (gyre-scale) circulation was lowest in summer 2014: 41.3 ± 8.2 Sv compared to 58.6 ± 7.4 Sv in 2016. The heat transport (0.39 ± 0.08 PW in summer 2014, positive is northward) was highest for the section with the highest AMOC, and the freshwater transport was largest in summer 2016 when the isopycnal circulation was high (-0.25 ± 0.08 Sv). Up to 65% of the heat and freshwater transport was carried by the isopycnal circulation, with isopycnal property transport highest in the western Labrador Sea and the eastern basins (Iceland Basin to Scotland). |
format |
Article in Journal/Newspaper |
author |
Holliday, N. P. Bacon, S. Cunningham, S. A. Gary, S. F. Karstensen, Johannes King, B. A. Li, F. Mcdonagh, E. L. |
spellingShingle |
Holliday, N. P. Bacon, S. Cunningham, S. A. Gary, S. F. Karstensen, Johannes King, B. A. Li, F. Mcdonagh, E. L. Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016 |
author_facet |
Holliday, N. P. Bacon, S. Cunningham, S. A. Gary, S. F. Karstensen, Johannes King, B. A. Li, F. Mcdonagh, E. L. |
author_sort |
Holliday, N. P. |
title |
Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016 |
title_short |
Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016 |
title_full |
Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016 |
title_fullStr |
Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016 |
title_full_unstemmed |
Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016 |
title_sort |
subpolar north atlantic overturning and gyre-scale circulation in the summers of 2014 and 2016 |
publisher |
AGU (American Geophysical Union) |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/43982/ https://oceanrep.geomar.de/id/eprint/43982/1/Holliday_Karstensen_2018.pdf https://doi.org/10.1029/2018JC013841 |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
Greenland Iceland Labrador Sea North Atlantic |
genre_facet |
Greenland Iceland Labrador Sea North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/43982/1/Holliday_Karstensen_2018.pdf Holliday, N. P., Bacon, S., Cunningham, S. A., Gary, S. F., Karstensen, J. , King, B. A., Li, F. and Mcdonagh, E. L. (2018) Subpolar North Atlantic Overturning and Gyre-Scale Circulation in the Summers of 2014 and 2016. Open Access Journal of Geophysical Research: Oceans, 123 (7). pp. 4538-4559. DOI 10.1029/2018JC013841 <https://doi.org/10.1029/2018JC013841>. doi:10.1029/2018JC013841 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018JC013841 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
7 |
container_start_page |
4538 |
op_container_end_page |
4559 |
_version_ |
1766019464218804224 |