Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer
Author Posting. © American Meteorological Society, 2015. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 45 (2015): 2913–2932, doi:10.1175/JPO-D-14-0179.1....
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Online Access: | https://hdl.handle.net/1912/7721 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7721 2023-05-15T16:00:38+02:00 Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer Xu, Xiaobiao Rhines, Peter B. Chassignet, Eric P. Schmitz, William J. 2015-12 application/pdf https://hdl.handle.net/1912/7721 en_US eng American Meteorological Society https://doi.org/10.1175/JPO-D-14-0179.1 Journal of Physical Oceanography 45 (2015): 2913–2932 https://hdl.handle.net/1912/7721 doi:10.1175/JPO-D-14-0179.1 Journal of Physical Oceanography 45 (2015): 2913–2932 doi:10.1175/JPO-D-14-0179.1 Circulation/ Dynamics Abyssal circulation Boundary currents Ocean circulation Ocean dynamics Potential vorticity Topographic effects Article 2015 ftwhoas https://doi.org/10.1175/JPO-D-14-0179.1 2022-05-28T22:59:30Z Author Posting. © American Meteorological Society, 2015. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 45 (2015): 2913–2932, doi:10.1175/JPO-D-14-0179.1. The oceanic deep circulation is shared between concentrated deep western boundary currents (DWBCs) and broader interior pathways, a process that is sensitive to seafloor topography. This study investigates the spreading and deepening of Denmark Strait overflow water (DSOW) in the western subpolar North Atlantic using two ° eddy-resolving Atlantic simulations, including a passive tracer injected into the DSOW. The deepest layers of DSOW transit from a narrow DWBC in the southern Irminger Sea into widespread westward flow across the central Labrador Sea, which remerges along the Labrador coast. This abyssal circulation, in contrast to the upper levels of overflow water that remain as a boundary current, blankets the deep Labrador Sea with DSOW. Farther downstream after being steered around the abrupt topography of Orphan Knoll, DSOW again leaves the boundary, forming cyclonic recirculation cells in the deep Newfoundland basin. The deep recirculation, mostly driven by the meandering pathway of the upper North Atlantic Current, leads to accumulation of tracer offshore of Orphan Knoll, precisely where a local maximum of chlorofluorocarbon (CFC) inventory is observed. At Flemish Cap, eddy fluxes carry ~20% of the tracer transport from the boundary current into the interior. Potential vorticity is conserved as the flow of DSOW broadens at the transition from steep to less steep continental rise into the Labrador Sea, while around the abrupt topography of Orphan Knoll, potential vorticity is not conserved and the DSOW deepens significantly. This work is supported by ONR Award N00014-09-1-0587, the NSF Physical Oceanography Program, and NASA Ocean Surface Topography Science Team Program. 2016-06-01 Article in Journal/Newspaper Denmark Strait Labrador Sea Newfoundland north atlantic current North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Newfoundland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Orphan Knoll ENVELOPE(-46.500,-46.500,50.500,50.500) Journal of Physical Oceanography 45 12 2913 2932 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Circulation/ Dynamics Abyssal circulation Boundary currents Ocean circulation Ocean dynamics Potential vorticity Topographic effects |
spellingShingle |
Circulation/ Dynamics Abyssal circulation Boundary currents Ocean circulation Ocean dynamics Potential vorticity Topographic effects Xu, Xiaobiao Rhines, Peter B. Chassignet, Eric P. Schmitz, William J. Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer |
topic_facet |
Circulation/ Dynamics Abyssal circulation Boundary currents Ocean circulation Ocean dynamics Potential vorticity Topographic effects |
description |
Author Posting. © American Meteorological Society, 2015. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 45 (2015): 2913–2932, doi:10.1175/JPO-D-14-0179.1. The oceanic deep circulation is shared between concentrated deep western boundary currents (DWBCs) and broader interior pathways, a process that is sensitive to seafloor topography. This study investigates the spreading and deepening of Denmark Strait overflow water (DSOW) in the western subpolar North Atlantic using two ° eddy-resolving Atlantic simulations, including a passive tracer injected into the DSOW. The deepest layers of DSOW transit from a narrow DWBC in the southern Irminger Sea into widespread westward flow across the central Labrador Sea, which remerges along the Labrador coast. This abyssal circulation, in contrast to the upper levels of overflow water that remain as a boundary current, blankets the deep Labrador Sea with DSOW. Farther downstream after being steered around the abrupt topography of Orphan Knoll, DSOW again leaves the boundary, forming cyclonic recirculation cells in the deep Newfoundland basin. The deep recirculation, mostly driven by the meandering pathway of the upper North Atlantic Current, leads to accumulation of tracer offshore of Orphan Knoll, precisely where a local maximum of chlorofluorocarbon (CFC) inventory is observed. At Flemish Cap, eddy fluxes carry ~20% of the tracer transport from the boundary current into the interior. Potential vorticity is conserved as the flow of DSOW broadens at the transition from steep to less steep continental rise into the Labrador Sea, while around the abrupt topography of Orphan Knoll, potential vorticity is not conserved and the DSOW deepens significantly. This work is supported by ONR Award N00014-09-1-0587, the NSF Physical Oceanography Program, and NASA Ocean Surface Topography Science Team Program. 2016-06-01 |
format |
Article in Journal/Newspaper |
author |
Xu, Xiaobiao Rhines, Peter B. Chassignet, Eric P. Schmitz, William J. |
author_facet |
Xu, Xiaobiao Rhines, Peter B. Chassignet, Eric P. Schmitz, William J. |
author_sort |
Xu, Xiaobiao |
title |
Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer |
title_short |
Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer |
title_full |
Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer |
title_fullStr |
Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer |
title_full_unstemmed |
Spreading of Denmark Strait overflow water in the western subpolar North Atlantic : insights from eddy-resolving simulations with a passive tracer |
title_sort |
spreading of denmark strait overflow water in the western subpolar north atlantic : insights from eddy-resolving simulations with a passive tracer |
publisher |
American Meteorological Society |
publishDate |
2015 |
url |
https://hdl.handle.net/1912/7721 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(-46.500,-46.500,50.500,50.500) |
geographic |
Newfoundland Irminger Sea Orphan Knoll |
geographic_facet |
Newfoundland Irminger Sea Orphan Knoll |
genre |
Denmark Strait Labrador Sea Newfoundland north atlantic current North Atlantic |
genre_facet |
Denmark Strait Labrador Sea Newfoundland north atlantic current North Atlantic |
op_source |
Journal of Physical Oceanography 45 (2015): 2913–2932 doi:10.1175/JPO-D-14-0179.1 |
op_relation |
https://doi.org/10.1175/JPO-D-14-0179.1 Journal of Physical Oceanography 45 (2015): 2913–2932 https://hdl.handle.net/1912/7721 doi:10.1175/JPO-D-14-0179.1 |
op_doi |
https://doi.org/10.1175/JPO-D-14-0179.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
45 |
container_issue |
12 |
container_start_page |
2913 |
op_container_end_page |
2932 |
_version_ |
1766396645689262080 |