Deep through-flow in the Bight Fracture Zone
Iceland–Scotland Overflow Water (ISOW) is exported from the Nordic Seas into the Iceland Basin to feed the lower limb of the Meridional Overturning Circulation. The Bight Fracture Zone (BFZ) is known to be a major route for ISOW toward the Irminger Sea, but the role of this gateway in the evolution...
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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/os-18-1055-2022 https://os.copernicus.org/articles/18/1055/2022/os-18-1055-2022.pdf https://doaj.org/article/1d0a8f4db8f74d5bb92b293846b36da0 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:1d0a8f4db8f74d5bb92b293846b36da0 2023-05-15T16:47:03+02:00 Deep through-flow in the Bight Fracture Zone T. Petit V. Thierry H. Mercier 2022-07-01 https://doi.org/10.5194/os-18-1055-2022 https://os.copernicus.org/articles/18/1055/2022/os-18-1055-2022.pdf https://doaj.org/article/1d0a8f4db8f74d5bb92b293846b36da0 en eng Copernicus Publications doi:10.5194/os-18-1055-2022 1812-0784 1812-0792 https://os.copernicus.org/articles/18/1055/2022/os-18-1055-2022.pdf https://doaj.org/article/1d0a8f4db8f74d5bb92b293846b36da0 undefined Ocean Science, Vol 18, Pp 1055-1071 (2022) geo hist Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/os-18-1055-2022 2023-01-22T18:58:20Z Iceland–Scotland Overflow Water (ISOW) is exported from the Nordic Seas into the Iceland Basin to feed the lower limb of the Meridional Overturning Circulation. The Bight Fracture Zone (BFZ) is known to be a major route for ISOW toward the Irminger Sea, but the role of this gateway in the evolution of ISOW properties over the subpolar gyre is unclear. A combination of ship-based and Deep-Argo data gathered between 2015 and 2018 allows us to investigate the pathways and hydrographic evolution of ISOW as it flows through the BFZ, as well as its influence on the North Atlantic Deep Water (NADW) properties in the Irminger Sea. The ISOW flow through the BFZ amounts to 0.8 ± 0.2 Sv and is mainly fed by the lighter part of the ISOW layer flowing west of 29–30∘ W as part of the East Reykjanes Ridge Current in the Iceland Basin. In the rift valley of the BFZ, between an eastern and a western sill, the bathymetry of the BFZ shapes a cyclonic circulation along which the ISOW layer is homogenized. The largest changes in ISOW properties are however observed downstream of the western sill, at the exit of the BFZ. There, ISOW is mixed isopycnally with comparatively fresher NADW circulating in the Irminger Sea. Hence, our analysis reveals the key role of the BFZ through-flow in the salinification of the NADW in the Irminger Current. Article in Journal/Newspaper Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic Unknown Bight Fracture Zone ENVELOPE(-33.000,-33.000,56.833,56.833) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Ocean Science 18 4 1055 1071 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo hist |
spellingShingle |
geo hist T. Petit V. Thierry H. Mercier Deep through-flow in the Bight Fracture Zone |
topic_facet |
geo hist |
description |
Iceland–Scotland Overflow Water (ISOW) is exported from the Nordic Seas into the Iceland Basin to feed the lower limb of the Meridional Overturning Circulation. The Bight Fracture Zone (BFZ) is known to be a major route for ISOW toward the Irminger Sea, but the role of this gateway in the evolution of ISOW properties over the subpolar gyre is unclear. A combination of ship-based and Deep-Argo data gathered between 2015 and 2018 allows us to investigate the pathways and hydrographic evolution of ISOW as it flows through the BFZ, as well as its influence on the North Atlantic Deep Water (NADW) properties in the Irminger Sea. The ISOW flow through the BFZ amounts to 0.8 ± 0.2 Sv and is mainly fed by the lighter part of the ISOW layer flowing west of 29–30∘ W as part of the East Reykjanes Ridge Current in the Iceland Basin. In the rift valley of the BFZ, between an eastern and a western sill, the bathymetry of the BFZ shapes a cyclonic circulation along which the ISOW layer is homogenized. The largest changes in ISOW properties are however observed downstream of the western sill, at the exit of the BFZ. There, ISOW is mixed isopycnally with comparatively fresher NADW circulating in the Irminger Sea. Hence, our analysis reveals the key role of the BFZ through-flow in the salinification of the NADW in the Irminger Current. |
format |
Article in Journal/Newspaper |
author |
T. Petit V. Thierry H. Mercier |
author_facet |
T. Petit V. Thierry H. Mercier |
author_sort |
T. Petit |
title |
Deep through-flow in the Bight Fracture Zone |
title_short |
Deep through-flow in the Bight Fracture Zone |
title_full |
Deep through-flow in the Bight Fracture Zone |
title_fullStr |
Deep through-flow in the Bight Fracture Zone |
title_full_unstemmed |
Deep through-flow in the Bight Fracture Zone |
title_sort |
deep through-flow in the bight fracture zone |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/os-18-1055-2022 https://os.copernicus.org/articles/18/1055/2022/os-18-1055-2022.pdf https://doaj.org/article/1d0a8f4db8f74d5bb92b293846b36da0 |
long_lat |
ENVELOPE(-33.000,-33.000,56.833,56.833) ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Bight Fracture Zone Irminger Sea Reykjanes |
geographic_facet |
Bight Fracture Zone Irminger Sea Reykjanes |
genre |
Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic |
genre_facet |
Iceland NADW Nordic Seas North Atlantic Deep Water North Atlantic |
op_source |
Ocean Science, Vol 18, Pp 1055-1071 (2022) |
op_relation |
doi:10.5194/os-18-1055-2022 1812-0784 1812-0792 https://os.copernicus.org/articles/18/1055/2022/os-18-1055-2022.pdf https://doaj.org/article/1d0a8f4db8f74d5bb92b293846b36da0 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/os-18-1055-2022 |
container_title |
Ocean Science |
container_volume |
18 |
container_issue |
4 |
container_start_page |
1055 |
op_container_end_page |
1071 |
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1766037148524347392 |