Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in a high–resolution ocean model
North Atlantic Deep Water (NADW) is a crucial component of the Atlantic Meridional Overturning Circulation and, therefore, is an important factor of the climate system. In order to estimate the mean relative contributions, sources and pathways of the three different deep water mass components (namel...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00061007 2023-05-15T16:00:38+02:00 Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in a high–resolution ocean model Fröhle, Jörg Handmann, Patricia Biastoch, Arne 2022-05 electronic https://doi.org/10.5194/egusphere-2022-313 https://noa.gwlb.de/receive/cop_mods_00061007 https://egusphere.copernicus.org/preprints/egusphere-2022-313/egusphere-2022-313.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-313 https://noa.gwlb.de/receive/cop_mods_00061007 https://egusphere.copernicus.org/preprints/egusphere-2022-313/egusphere-2022-313.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-313 2022-05-22T23:11:02Z North Atlantic Deep Water (NADW) is a crucial component of the Atlantic Meridional Overturning Circulation and, therefore, is an important factor of the climate system. In order to estimate the mean relative contributions, sources and pathways of the three different deep water mass components (namely Labrador Sea Water, Northeast Atlantic Deep Water and Denmark Strait Overflow Water) at the southern exit of the Labrador Sea, Lagrangian particle experiments were performed. The particles were seeded according to the strength of the velocity field along the 53° N section and computed 40 years backward in time in the three-dimensional velocity and hydrography field. Water masses were defined within the model output in the central Labrador Sea and the subpolar North Atlantic. The resulting transport pathways, their sources and corresponding transit time scales were inferred. Our experiments show that the majority of NADW passing 53° N is associated with diapycnal mass flux, 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 cross the Greenland–Scotland Ridge within the NADW density class, where about 2/3 pass Denmark Strait, while 1/3 cross the Iceland Scotland Ridge. The NADW exported at 53° N is hence dominated by entrainment through diapycnal mass flux and the 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 Northeast Atlantic Niedersächsisches Online-Archiv NOA Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Fröhle, Jörg Handmann, Patricia Biastoch, Arne Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in a high–resolution ocean model |
topic_facet |
article Verlagsveröffentlichung |
description |
North Atlantic Deep Water (NADW) is a crucial component of the Atlantic Meridional Overturning Circulation and, therefore, is an important factor of the climate system. In order to estimate the mean relative contributions, sources and pathways of the three different deep water mass components (namely Labrador Sea Water, Northeast Atlantic Deep Water and Denmark Strait Overflow Water) at the southern exit of the Labrador Sea, Lagrangian particle experiments were performed. The particles were seeded according to the strength of the velocity field along the 53° N section and computed 40 years backward in time in the three-dimensional velocity and hydrography field. Water masses were defined within the model output in the central Labrador Sea and the subpolar North Atlantic. The resulting transport pathways, their sources and corresponding transit time scales were inferred. Our experiments show that the majority of NADW passing 53° N is associated with diapycnal mass flux, 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 cross the Greenland–Scotland Ridge within the NADW density class, where about 2/3 pass Denmark Strait, while 1/3 cross the Iceland Scotland Ridge. The NADW exported at 53° N is hence dominated by entrainment through diapycnal mass flux and the mixed layer origin in the Labrador Sea. |
format |
Article in Journal/Newspaper |
author |
Fröhle, Jörg Handmann, Patricia Biastoch, Arne |
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 a high–resolution ocean model |
title_short |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in a high–resolution ocean model |
title_full |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in a high–resolution ocean model |
title_fullStr |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in a high–resolution ocean model |
title_full_unstemmed |
Major sources of North Atlantic Deep Water in the subpolar North Atlantic from Lagrangian analyses in a high–resolution ocean model |
title_sort |
major sources of north atlantic deep water in the subpolar north atlantic from lagrangian analyses in a high–resolution ocean model |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-313 https://noa.gwlb.de/receive/cop_mods_00061007 https://egusphere.copernicus.org/preprints/egusphere-2022-313/egusphere-2022-313.pdf |
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 Northeast Atlantic |
genre_facet |
Denmark Strait Greenland Greenland-Scotland Ridge Iceland Labrador Sea NADW North Atlantic Deep Water North Atlantic Northeast Atlantic |
op_relation |
https://doi.org/10.5194/egusphere-2022-313 https://noa.gwlb.de/receive/cop_mods_00061007 https://egusphere.copernicus.org/preprints/egusphere-2022-313/egusphere-2022-313.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-313 |
_version_ |
1766396635827404800 |