Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic
A long-term mean flow field for the subpolar North Atlantic region with a horizontal resolution of approximately 25 km is created by gridding Argo-derived velocity vectors using two different topography-following interpolation schemes. The 10-day float displacements in the typical drift depths of 10...
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Language: | English |
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004420 2023-05-15T16:48:41+02:00 Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic Fischer, Jürgen Karstensen, Johannes Oltmanns, Marilena Schmidtko, Sunke 2018-10 electronic https://doi.org/10.5194/os-14-1167-2018 https://noa.gwlb.de/receive/cop_mods_00004420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004377/os-14-1167-2018.pdf https://os.copernicus.org/articles/14/1167/2018/os-14-1167-2018.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-14-1167-2018 https://noa.gwlb.de/receive/cop_mods_00004420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004377/os-14-1167-2018.pdf https://os.copernicus.org/articles/14/1167/2018/os-14-1167-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/os-14-1167-2018 2022-02-08T23:00:06Z A long-term mean flow field for the subpolar North Atlantic region with a horizontal resolution of approximately 25 km is created by gridding Argo-derived velocity vectors using two different topography-following interpolation schemes. The 10-day float displacements in the typical drift depths of 1000 to 1500 m represent the flow in the Labrador Sea Water density range. Both mapping algorithms separate the flow field into potential vorticity (PV) conserving, i.e., topography-following contribution and a deviating part, which we define as the eddy contribution. To verify the significance of the separation, we compare the mean flow and the eddy kinetic energy (EKE), derived from both mapping algorithms, with those obtained from multiyear mooring observations. The PV-conserving mean flow is characterized by stable boundary currents along all major topographic features including shelf breaks and basin-interior topographic ridges such as the Reykjanes Ridge or the Rockall Plateau. Mid-basin northward advection pathways from the northeastern Labrador Sea into the Irminger Sea and from the Mid-Atlantic Ridge region into the Iceland Basin are well-resolved. An eastward flow is present across the southern boundary of the subpolar gyre near 52∘ N, the latitude of the Charlie Gibbs Fracture Zone (CGFZ). The mid-depth EKE field resembles most of the satellite-derived surface EKE field. However, noticeable differences exist along the northward advection pathways in the Irminger Sea and the Iceland Basin, where the deep EKE exceeds the surface EKE field. Further, the ratio between mean flow and the square root of the EKE, the Peclet number, reveals distinct advection-dominated regions as well as basin-interior regimes in which mixing is prevailing. Article in Journal/Newspaper Iceland Labrador Sea North Atlantic Niedersächsisches Online-Archiv NOA Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Mid-Atlantic Ridge Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Rockall Plateau ENVELOPE(-18.833,-18.833,56.333,56.333) Ocean Science 14 5 1167 1183 |
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Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Fischer, Jürgen Karstensen, Johannes Oltmanns, Marilena Schmidtko, Sunke Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic |
topic_facet |
article Verlagsveröffentlichung |
description |
A long-term mean flow field for the subpolar North Atlantic region with a horizontal resolution of approximately 25 km is created by gridding Argo-derived velocity vectors using two different topography-following interpolation schemes. The 10-day float displacements in the typical drift depths of 1000 to 1500 m represent the flow in the Labrador Sea Water density range. Both mapping algorithms separate the flow field into potential vorticity (PV) conserving, i.e., topography-following contribution and a deviating part, which we define as the eddy contribution. To verify the significance of the separation, we compare the mean flow and the eddy kinetic energy (EKE), derived from both mapping algorithms, with those obtained from multiyear mooring observations. The PV-conserving mean flow is characterized by stable boundary currents along all major topographic features including shelf breaks and basin-interior topographic ridges such as the Reykjanes Ridge or the Rockall Plateau. Mid-basin northward advection pathways from the northeastern Labrador Sea into the Irminger Sea and from the Mid-Atlantic Ridge region into the Iceland Basin are well-resolved. An eastward flow is present across the southern boundary of the subpolar gyre near 52∘ N, the latitude of the Charlie Gibbs Fracture Zone (CGFZ). The mid-depth EKE field resembles most of the satellite-derived surface EKE field. However, noticeable differences exist along the northward advection pathways in the Irminger Sea and the Iceland Basin, where the deep EKE exceeds the surface EKE field. Further, the ratio between mean flow and the square root of the EKE, the Peclet number, reveals distinct advection-dominated regions as well as basin-interior regimes in which mixing is prevailing. |
format |
Article in Journal/Newspaper |
author |
Fischer, Jürgen Karstensen, Johannes Oltmanns, Marilena Schmidtko, Sunke |
author_facet |
Fischer, Jürgen Karstensen, Johannes Oltmanns, Marilena Schmidtko, Sunke |
author_sort |
Fischer, Jürgen |
title |
Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic |
title_short |
Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic |
title_full |
Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic |
title_fullStr |
Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic |
title_full_unstemmed |
Mean circulation and EKE distribution in the Labrador Sea Water level of the subpolar North Atlantic |
title_sort |
mean circulation and eke distribution in the labrador sea water level of the subpolar north atlantic |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/os-14-1167-2018 https://noa.gwlb.de/receive/cop_mods_00004420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004377/os-14-1167-2018.pdf https://os.copernicus.org/articles/14/1167/2018/os-14-1167-2018.pdf |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(-22.250,-22.250,65.467,65.467) ENVELOPE(-18.833,-18.833,56.333,56.333) |
geographic |
Irminger Sea Mid-Atlantic Ridge Reykjanes Rockall Plateau |
geographic_facet |
Irminger Sea Mid-Atlantic Ridge Reykjanes Rockall Plateau |
genre |
Iceland Labrador Sea North Atlantic |
genre_facet |
Iceland Labrador Sea North Atlantic |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-14-1167-2018 https://noa.gwlb.de/receive/cop_mods_00004420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004377/os-14-1167-2018.pdf https://os.copernicus.org/articles/14/1167/2018/os-14-1167-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/os-14-1167-2018 |
container_title |
Ocean Science |
container_volume |
14 |
container_issue |
5 |
container_start_page |
1167 |
op_container_end_page |
1183 |
_version_ |
1766038770383060992 |