Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations
Repeat glider sections obtained during 2014‐2016, as part of the Overturning in the Subpolar North Atlantic Program (OSNAP), are used to quantify the circulation and transport of North Atlantic Current (NAC) branches over the Rockall Plateau. Using sixteen gliders sections collected along 58° N and...
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Online Access: | https://zenodo.org/record/1323749 https://doi.org/10.1029/2018JC014162 |
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ftzenodo:oai:zenodo.org:1323749 2023-05-15T16:52:02+02:00 Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations Houpert, Loic Inall, Mark Dumont, Estelle Gary, Stefan Johnson, Clare Porter, Marie Johns, Bill Cunningham, Stuart 2018-07-23 https://zenodo.org/record/1323749 https://doi.org/10.1029/2018JC014162 unknown info:eu-repo/grantAgreement/EC/H2020/678760/ https://zenodo.org/communities/atlas https://zenodo.org/record/1323749 https://doi.org/10.1029/2018JC014162 oai:zenodo.org:1323749 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Journal of Geophysical Research: Oceans info:eu-repo/semantics/article publication-article 2018 ftzenodo https://doi.org/10.1029/2018JC014162 2023-03-10T22:24:32Z Repeat glider sections obtained during 2014‐2016, as part of the Overturning in the Subpolar North Atlantic Program (OSNAP), are used to quantify the circulation and transport of North Atlantic Current (NAC) branches over the Rockall Plateau. Using sixteen gliders sections collected along 58° N and between 21° W and 15° W, absolute geostrophic velocities are calculated and subsequently the horizontal and vertical structure of the transport are characterized. The annual mean northward transport ( ± standard deviation) is 5.1 ± 3.2 Sv over the Rockall Plateau. During summer (May to October), the mean northward transport is stronger and reaches 6.7 ± 2.6 Sv. This accounts for 43% of the total NAC transport of upper‐ocean waters (σO < 27.55kg.m−3) estimated by Sarafanov et al. [2012] along 59.5° N, between the Reykjanes Ridge and Scotland. Two quasi‐permanent northward‐flowing branches of the NAC are identified: (i) the Hatton Bank Jet (6.3 ± 2.1 Sv) over the eastern flank of the Iceland Basin (20.5° W to 18.5° W); and (ii) the Rockall Bank Jet (1.5 ± 0.7 Sv) over the eastern flank of the Hatton‐Rockall Basin (16° W to 15° W). Transport associated with the Rockall Bank Jet is mostly depth‐independent during summer, while 30% of the Hatton Bank jet transport is due to vertical geostrophic shear. Uncertainties are estimated for each individual glider section using a Monte Carlo approach and mean uncertainties of the absolute transport are less than 0.5 Sv. Although comparisons with altimetry‐based estimates indicate similar large‐scale circulation patterns, altimetry data do not resolve small mesoscale current bands in the Hatton‐Rockall Basin which are strongly needed for the right transport estimates. Article in Journal/Newspaper Iceland north atlantic current North Atlantic Zenodo Hatton Bank ENVELOPE(-18.000,-18.000,58.583,58.583) Hatton-Rockall Basin ENVELOPE(-17.000,-17.000,57.500,57.500) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Rockall Bank ENVELOPE(-16.519,-16.519,55.821,55.821) Rockall Plateau ENVELOPE(-18.833,-18.833,56.333,56.333) Journal of Geophysical Research: Oceans 123 8 6019 6038 |
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Open Polar |
collection |
Zenodo |
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ftzenodo |
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description |
Repeat glider sections obtained during 2014‐2016, as part of the Overturning in the Subpolar North Atlantic Program (OSNAP), are used to quantify the circulation and transport of North Atlantic Current (NAC) branches over the Rockall Plateau. Using sixteen gliders sections collected along 58° N and between 21° W and 15° W, absolute geostrophic velocities are calculated and subsequently the horizontal and vertical structure of the transport are characterized. The annual mean northward transport ( ± standard deviation) is 5.1 ± 3.2 Sv over the Rockall Plateau. During summer (May to October), the mean northward transport is stronger and reaches 6.7 ± 2.6 Sv. This accounts for 43% of the total NAC transport of upper‐ocean waters (σO < 27.55kg.m−3) estimated by Sarafanov et al. [2012] along 59.5° N, between the Reykjanes Ridge and Scotland. Two quasi‐permanent northward‐flowing branches of the NAC are identified: (i) the Hatton Bank Jet (6.3 ± 2.1 Sv) over the eastern flank of the Iceland Basin (20.5° W to 18.5° W); and (ii) the Rockall Bank Jet (1.5 ± 0.7 Sv) over the eastern flank of the Hatton‐Rockall Basin (16° W to 15° W). Transport associated with the Rockall Bank Jet is mostly depth‐independent during summer, while 30% of the Hatton Bank jet transport is due to vertical geostrophic shear. Uncertainties are estimated for each individual glider section using a Monte Carlo approach and mean uncertainties of the absolute transport are less than 0.5 Sv. Although comparisons with altimetry‐based estimates indicate similar large‐scale circulation patterns, altimetry data do not resolve small mesoscale current bands in the Hatton‐Rockall Basin which are strongly needed for the right transport estimates. |
format |
Article in Journal/Newspaper |
author |
Houpert, Loic Inall, Mark Dumont, Estelle Gary, Stefan Johnson, Clare Porter, Marie Johns, Bill Cunningham, Stuart |
spellingShingle |
Houpert, Loic Inall, Mark Dumont, Estelle Gary, Stefan Johnson, Clare Porter, Marie Johns, Bill Cunningham, Stuart Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations |
author_facet |
Houpert, Loic Inall, Mark Dumont, Estelle Gary, Stefan Johnson, Clare Porter, Marie Johns, Bill Cunningham, Stuart |
author_sort |
Houpert, Loic |
title |
Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations |
title_short |
Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations |
title_full |
Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations |
title_fullStr |
Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations |
title_full_unstemmed |
Structure and transport of the North Atlantic Current in the eastern subpolar gyre from sustained glider observations |
title_sort |
structure and transport of the north atlantic current in the eastern subpolar gyre from sustained glider observations |
publishDate |
2018 |
url |
https://zenodo.org/record/1323749 https://doi.org/10.1029/2018JC014162 |
long_lat |
ENVELOPE(-18.000,-18.000,58.583,58.583) ENVELOPE(-17.000,-17.000,57.500,57.500) ENVELOPE(-22.250,-22.250,65.467,65.467) ENVELOPE(-16.519,-16.519,55.821,55.821) ENVELOPE(-18.833,-18.833,56.333,56.333) |
geographic |
Hatton Bank Hatton-Rockall Basin Reykjanes Rockall Bank Rockall Plateau |
geographic_facet |
Hatton Bank Hatton-Rockall Basin Reykjanes Rockall Bank Rockall Plateau |
genre |
Iceland north atlantic current North Atlantic |
genre_facet |
Iceland north atlantic current North Atlantic |
op_source |
Journal of Geophysical Research: Oceans |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/678760/ https://zenodo.org/communities/atlas https://zenodo.org/record/1323749 https://doi.org/10.1029/2018JC014162 oai:zenodo.org:1323749 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1029/2018JC014162 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
8 |
container_start_page |
6019 |
op_container_end_page |
6038 |
_version_ |
1766042161731600384 |