Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements
The Rockall Trough is one of the main conduits for warm Atlantic Water to the Nordic Seas. Ocean heat anomalies, originating from the eastern subpolar gyre, are known to influence Arctic sea ice extent, marine ecosystems, and continental climate. Knowledge of the transport through this basin has pre...
Published in: | Journal of Geophysical Research: Oceans |
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2020
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ftuhipublicatio:oai:pure.atira.dk:publications/b25d6892-d50c-413f-a0b5-5f440d2fe0eb 2024-06-23T07:50:36+00:00 Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements Houpert, Loïc Cunningham, Stuart Fraser, Neil Johnson, Clare Louise Holliday, N. Penny Jones, Samuel Moat, Ben Rayner, Darren 2020-09-30 application/pdf https://pure.uhi.ac.uk/en/publications/b25d6892-d50c-413f-a0b5-5f440d2fe0eb https://doi.org/10.1029/2020JC016403 https://pureadmin.uhi.ac.uk/ws/files/14324635/manuscript_as_accepted.pdf https://pureadmin.uhi.ac.uk/ws/files/14324637/SM_as_accepted.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JC016403 eng eng https://pure.uhi.ac.uk/en/publications/b25d6892-d50c-413f-a0b5-5f440d2fe0eb info:eu-repo/semantics/openAccess Houpert , L , Cunningham , S , Fraser , N , Johnson , C L , Holliday , N P , Jones , S , Moat , B & Rayner , D 2020 , ' Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements ' , Journal of Geophysical Research: Oceans , vol. 125 , no. 10 , e2020JC016403 . https://doi.org/10.1029/2020JC016403 article 2020 ftuhipublicatio https://doi.org/10.1029/2020JC016403 2024-05-27T23:56:27Z The Rockall Trough is one of the main conduits for warm Atlantic Water to the Nordic Seas. Ocean heat anomalies, originating from the eastern subpolar gyre, are known to influence Arctic sea ice extent, marine ecosystems, and continental climate. Knowledge of the transport through this basin has previously been limited to estimates from hydrographic sections which cannot characterize the intra‐annual and multiannual variability. As part of the Overturning in the Subpolar North Atlantic Programme (OSNAP), a mooring array was deployed in the Rockall Trough in order to obtain the first continuous measurements of transport. Here, we define the methodology and the errors associated with estimating these transports. Results show a 4‐year mean northward transport of 6.6 Sv (1 Sv = 106 m3/s) by the North Atlantic Current (NAC) in the east and interior of the Rockall Trough (2014–2018). A mean transport of −2.0 Sv (southward) is observed in the west of the basin, which could be part of a recirculation around the Rockall Plateau. The 90‐day low‐pass‐filtered transport shows large subannual and interannual variability (−1.6 to 9.1 Sv), mostly resulting from changes in the midbasin geostrophic transport. Satellite altimetry reveals the periods of low and high transport are associated with significant changes in the Rockall Trough circulation. There is a detectable seasonal signal, with the greatest transport in spring and autumn. Article in Journal/Newspaper Arctic Nordic Seas north atlantic current North Atlantic Sea ice University of the Highlands and Islands: Research Database of UHI Arctic Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Rockall Plateau ENVELOPE(-18.833,-18.833,56.333,56.333) Journal of Geophysical Research: Oceans 125 10 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
description |
The Rockall Trough is one of the main conduits for warm Atlantic Water to the Nordic Seas. Ocean heat anomalies, originating from the eastern subpolar gyre, are known to influence Arctic sea ice extent, marine ecosystems, and continental climate. Knowledge of the transport through this basin has previously been limited to estimates from hydrographic sections which cannot characterize the intra‐annual and multiannual variability. As part of the Overturning in the Subpolar North Atlantic Programme (OSNAP), a mooring array was deployed in the Rockall Trough in order to obtain the first continuous measurements of transport. Here, we define the methodology and the errors associated with estimating these transports. Results show a 4‐year mean northward transport of 6.6 Sv (1 Sv = 106 m3/s) by the North Atlantic Current (NAC) in the east and interior of the Rockall Trough (2014–2018). A mean transport of −2.0 Sv (southward) is observed in the west of the basin, which could be part of a recirculation around the Rockall Plateau. The 90‐day low‐pass‐filtered transport shows large subannual and interannual variability (−1.6 to 9.1 Sv), mostly resulting from changes in the midbasin geostrophic transport. Satellite altimetry reveals the periods of low and high transport are associated with significant changes in the Rockall Trough circulation. There is a detectable seasonal signal, with the greatest transport in spring and autumn. |
format |
Article in Journal/Newspaper |
author |
Houpert, Loïc Cunningham, Stuart Fraser, Neil Johnson, Clare Louise Holliday, N. Penny Jones, Samuel Moat, Ben Rayner, Darren |
spellingShingle |
Houpert, Loïc Cunningham, Stuart Fraser, Neil Johnson, Clare Louise Holliday, N. Penny Jones, Samuel Moat, Ben Rayner, Darren Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements |
author_facet |
Houpert, Loïc Cunningham, Stuart Fraser, Neil Johnson, Clare Louise Holliday, N. Penny Jones, Samuel Moat, Ben Rayner, Darren |
author_sort |
Houpert, Loïc |
title |
Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements |
title_short |
Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements |
title_full |
Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements |
title_fullStr |
Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements |
title_full_unstemmed |
Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements |
title_sort |
observed variability of the north atlantic current in the rockall trough from four years on mooring measurements |
publishDate |
2020 |
url |
https://pure.uhi.ac.uk/en/publications/b25d6892-d50c-413f-a0b5-5f440d2fe0eb https://doi.org/10.1029/2020JC016403 https://pureadmin.uhi.ac.uk/ws/files/14324635/manuscript_as_accepted.pdf https://pureadmin.uhi.ac.uk/ws/files/14324637/SM_as_accepted.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JC016403 |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) ENVELOPE(-18.833,-18.833,56.333,56.333) |
geographic |
Arctic Rockall Trough Rockall Plateau |
geographic_facet |
Arctic Rockall Trough Rockall Plateau |
genre |
Arctic Nordic Seas north atlantic current North Atlantic Sea ice |
genre_facet |
Arctic Nordic Seas north atlantic current North Atlantic Sea ice |
op_source |
Houpert , L , Cunningham , S , Fraser , N , Johnson , C L , Holliday , N P , Jones , S , Moat , B & Rayner , D 2020 , ' Observed variability of the North Atlantic Current in the Rockall Trough from four years on mooring measurements ' , Journal of Geophysical Research: Oceans , vol. 125 , no. 10 , e2020JC016403 . https://doi.org/10.1029/2020JC016403 |
op_relation |
https://pure.uhi.ac.uk/en/publications/b25d6892-d50c-413f-a0b5-5f440d2fe0eb |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020JC016403 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
10 |
_version_ |
1802641502344577024 |