Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model
The North Atlantic Deep Water (NADW) is a crucial component of the Atlantic meridional overturning circulation and is therefore an important factor of the climate system. In order to estimate the mean relative contributions, sources, and pathways of the NADW at the southern exit of the Labrador Sea,...
Published in: | Ocean Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications (EGU)
2022
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Online Access: | https://oceanrep.geomar.de/id/eprint/56163/ https://oceanrep.geomar.de/id/eprint/56163/1/egusphere_2022_313.pdf https://oceanrep.geomar.de/id/eprint/56163/7/os-18-1431-2022.pdf https://oceanrep.geomar.de/id/eprint/56163/8/os-18-1431-2022-supplement.pdf https://doi.org/10.5194/os-18-1431-2022 |
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ftoceanrep:oai:oceanrep.geomar.de:56163 2024-02-11T10:03:19+01:00 Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model Fröhle, Jörg Handmann, Patricia Biastoch, Arne 2022-10-05 text https://oceanrep.geomar.de/id/eprint/56163/ https://oceanrep.geomar.de/id/eprint/56163/1/egusphere_2022_313.pdf https://oceanrep.geomar.de/id/eprint/56163/7/os-18-1431-2022.pdf https://oceanrep.geomar.de/id/eprint/56163/8/os-18-1431-2022-supplement.pdf https://doi.org/10.5194/os-18-1431-2022 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/56163/1/egusphere_2022_313.pdf https://oceanrep.geomar.de/id/eprint/56163/7/os-18-1431-2022.pdf https://oceanrep.geomar.de/id/eprint/56163/8/os-18-1431-2022-supplement.pdf Fröhle, J., Handmann, P. and Biastoch, A. (2022) Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model. Open Access Ocean Science, 18 (5). pp. 1431-1450. DOI 10.5194/os-18-1431-2022 <https://doi.org/10.5194/os-18-1431-2022>. doi:10.5194/os-18-1431-2022 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2022 ftoceanrep https://doi.org/10.5194/os-18-1431-2022 2024-01-15T00:25:24Z The North Atlantic Deep Water (NADW) is a crucial component of the Atlantic meridional overturning circulation and is therefore an important factor of the climate system. In order to estimate the mean relative contributions, sources, and pathways of the NADW at the southern exit of the Labrador Sea, a Lagrangian particle experiment is performed. The particles were seeded according to the strength of the velocity field along the 53∘ N section and traced 40 years backward in time in the three-dimensional velocity and hydrography field. The resulting transport pathways, their sources and corresponding transit timescales were inferred. Our experiment shows that, of the 30.1 Sv of NADW passing 53∘ N on average, the majority of this water is associated with a diapycnal mass flux without contact to the atmosphere, accounting for 14.3 Sv (48 %), where 6.2 Sv originate from the Labrador Sea, compared to 4.7 Sv from the Irminger Sea. The second-largest contribution originates from the mixed layer with 7.2 Sv (24 %), where the Labrador Sea contribution (5.9 Sv) dominates over the Irminger Sea contribution (1.0 Sv). Another 5.7 Sv (19 %) of NADW crosses the Greenland–Scotland Ridge within the NADW density class, where about two-thirds pass the Denmark Strait, while one-third crosses the Iceland–Scotland Ridge. The NADW exported at 53∘ N is hence dominated by entrainment through the diapycnal mass flux and mixed-layer origin in the Labrador Sea. Article in Journal/Newspaper Denmark Strait Greenland Greenland-Scotland Ridge Iceland Labrador Sea NADW North Atlantic Deep Water North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Ocean Science 18 5 1431 1450 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The North Atlantic Deep Water (NADW) is a crucial component of the Atlantic meridional overturning circulation and is therefore an important factor of the climate system. In order to estimate the mean relative contributions, sources, and pathways of the NADW at the southern exit of the Labrador Sea, a Lagrangian particle experiment is performed. The particles were seeded according to the strength of the velocity field along the 53∘ N section and traced 40 years backward in time in the three-dimensional velocity and hydrography field. The resulting transport pathways, their sources and corresponding transit timescales were inferred. Our experiment shows that, of the 30.1 Sv of NADW passing 53∘ N on average, the majority of this water is associated with a diapycnal mass flux without contact to the atmosphere, accounting for 14.3 Sv (48 %), where 6.2 Sv originate from the Labrador Sea, compared to 4.7 Sv from the Irminger Sea. The second-largest contribution originates from the mixed layer with 7.2 Sv (24 %), where the Labrador Sea contribution (5.9 Sv) dominates over the Irminger Sea contribution (1.0 Sv). Another 5.7 Sv (19 %) of NADW crosses the Greenland–Scotland Ridge within the NADW density class, where about two-thirds pass the Denmark Strait, while one-third crosses the Iceland–Scotland Ridge. The NADW exported at 53∘ N is hence dominated by entrainment through the diapycnal mass flux and mixed-layer origin in the Labrador Sea. |
format |
Article in Journal/Newspaper |
author |
Fröhle, Jörg Handmann, Patricia Biastoch, Arne |
spellingShingle |
Fröhle, Jörg Handmann, Patricia Biastoch, Arne Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model |
author_facet |
Fröhle, Jörg Handmann, Patricia Biastoch, Arne |
author_sort |
Fröhle, Jörg |
title |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model |
title_short |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model |
title_full |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model |
title_fullStr |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model |
title_full_unstemmed |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model |
title_sort |
major sources of north atlantic deep water in the subpolar north atlantic from lagrangian analyses in an eddy-rich ocean model |
publisher |
Copernicus Publications (EGU) |
publishDate |
2022 |
url |
https://oceanrep.geomar.de/id/eprint/56163/ https://oceanrep.geomar.de/id/eprint/56163/1/egusphere_2022_313.pdf https://oceanrep.geomar.de/id/eprint/56163/7/os-18-1431-2022.pdf https://oceanrep.geomar.de/id/eprint/56163/8/os-18-1431-2022-supplement.pdf https://doi.org/10.5194/os-18-1431-2022 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Denmark Strait Greenland Greenland-Scotland Ridge Iceland Labrador Sea NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Denmark Strait Greenland Greenland-Scotland Ridge Iceland Labrador Sea NADW North Atlantic Deep Water North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/56163/1/egusphere_2022_313.pdf https://oceanrep.geomar.de/id/eprint/56163/7/os-18-1431-2022.pdf https://oceanrep.geomar.de/id/eprint/56163/8/os-18-1431-2022-supplement.pdf Fröhle, J., Handmann, P. and Biastoch, A. (2022) Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in an eddy-rich ocean model. Open Access Ocean Science, 18 (5). pp. 1431-1450. DOI 10.5194/os-18-1431-2022 <https://doi.org/10.5194/os-18-1431-2022>. doi:10.5194/os-18-1431-2022 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-18-1431-2022 |
container_title |
Ocean Science |
container_volume |
18 |
container_issue |
5 |
container_start_page |
1431 |
op_container_end_page |
1450 |
_version_ |
1790599540712144896 |