Atlantic transport variability at 25 degrees N in six hydrographic sections
In January and February 2010, a sixth transatlantic hydrographic section was completed across 25° N, extending the hydrographic record at this latitude to over half a century. In combination with continuous transport measurements made since 2004 at 26.5° N by the Rapid-WATCH project, we reassess tra...
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Online Access: | https://pure.uhi.ac.uk/en/publications/2bd62f12-a10c-4537-9651-74fa2d5bc234 https://doi.org/10.5194/os-8-497-2012 https://pureadmin.uhi.ac.uk/ws/files/1899548/os_8_497_2012.pdf |
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ftuhipublicatio:oai:pure.atira.dk:publications/2bd62f12-a10c-4537-9651-74fa2d5bc234 2024-01-28T10:07:22+01:00 Atlantic transport variability at 25 degrees N in six hydrographic sections Atkinson, C. P. Bryden, H. L. Cunningham, S. A. King, B. A. 2012-07-19 application/pdf https://pure.uhi.ac.uk/en/publications/2bd62f12-a10c-4537-9651-74fa2d5bc234 https://doi.org/10.5194/os-8-497-2012 https://pureadmin.uhi.ac.uk/ws/files/1899548/os_8_497_2012.pdf eng eng info:eu-repo/semantics/openAccess Atkinson , C P , Bryden , H L , Cunningham , S A & King , B A 2012 , ' Atlantic transport variability at 25 degrees N in six hydrographic sections ' , Ocean Science , vol. 8 , no. 4 , pp. 497-523 . https://doi.org/10.5194/os-8-497-2012 article 2012 ftuhipublicatio https://doi.org/10.5194/os-8-497-2012 2024-01-04T23:20:38Z In January and February 2010, a sixth transatlantic hydrographic section was completed across 25° N, extending the hydrographic record at this latitude to over half a century. In combination with continuous transport measurements made since 2004 at 26.5° N by the Rapid-WATCH project, we reassess transport variability in the 25° N hydrographic record. Past studies of transport variability at this latitude have assumed transport estimates from each hydrographic section to represent annual average conditions. In this study the uncertainty in this assumption is assessed through use of Rapid-WATCH observations to quantify sub-seasonal and seasonal transport variability. Whilst in the upper-ocean no significant interannual or decadal transport variability are identified in the hydrographic record, in the deep ocean transport variability in both depth and potential temperature classes suggests some interannual or decadal variability may have occurred. This is particularly striking in the lower North Atlantic Deep Water where southward transports prior to 1998 were greater than recent transports by several Sverdrups. Whilst a cooling and freshening of Denmark Straits Overflow Water has occurred which is coincident with these transport changes, these water mass changes appear to be density compensated. Transport changes are the result of changing velocity shear in the vicinity of the Deep Western Boundary Current. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic University of the Highlands and Islands: Research Database of UHI Ocean Science 8 4 497 523 |
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Open Polar |
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University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
description |
In January and February 2010, a sixth transatlantic hydrographic section was completed across 25° N, extending the hydrographic record at this latitude to over half a century. In combination with continuous transport measurements made since 2004 at 26.5° N by the Rapid-WATCH project, we reassess transport variability in the 25° N hydrographic record. Past studies of transport variability at this latitude have assumed transport estimates from each hydrographic section to represent annual average conditions. In this study the uncertainty in this assumption is assessed through use of Rapid-WATCH observations to quantify sub-seasonal and seasonal transport variability. Whilst in the upper-ocean no significant interannual or decadal transport variability are identified in the hydrographic record, in the deep ocean transport variability in both depth and potential temperature classes suggests some interannual or decadal variability may have occurred. This is particularly striking in the lower North Atlantic Deep Water where southward transports prior to 1998 were greater than recent transports by several Sverdrups. Whilst a cooling and freshening of Denmark Straits Overflow Water has occurred which is coincident with these transport changes, these water mass changes appear to be density compensated. Transport changes are the result of changing velocity shear in the vicinity of the Deep Western Boundary Current. |
format |
Article in Journal/Newspaper |
author |
Atkinson, C. P. Bryden, H. L. Cunningham, S. A. King, B. A. |
spellingShingle |
Atkinson, C. P. Bryden, H. L. Cunningham, S. A. King, B. A. Atlantic transport variability at 25 degrees N in six hydrographic sections |
author_facet |
Atkinson, C. P. Bryden, H. L. Cunningham, S. A. King, B. A. |
author_sort |
Atkinson, C. P. |
title |
Atlantic transport variability at 25 degrees N in six hydrographic sections |
title_short |
Atlantic transport variability at 25 degrees N in six hydrographic sections |
title_full |
Atlantic transport variability at 25 degrees N in six hydrographic sections |
title_fullStr |
Atlantic transport variability at 25 degrees N in six hydrographic sections |
title_full_unstemmed |
Atlantic transport variability at 25 degrees N in six hydrographic sections |
title_sort |
atlantic transport variability at 25 degrees n in six hydrographic sections |
publishDate |
2012 |
url |
https://pure.uhi.ac.uk/en/publications/2bd62f12-a10c-4537-9651-74fa2d5bc234 https://doi.org/10.5194/os-8-497-2012 https://pureadmin.uhi.ac.uk/ws/files/1899548/os_8_497_2012.pdf |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Atkinson , C P , Bryden , H L , Cunningham , S A & King , B A 2012 , ' Atlantic transport variability at 25 degrees N in six hydrographic sections ' , Ocean Science , vol. 8 , no. 4 , pp. 497-523 . https://doi.org/10.5194/os-8-497-2012 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-8-497-2012 |
container_title |
Ocean Science |
container_volume |
8 |
container_issue |
4 |
container_start_page |
497 |
op_container_end_page |
523 |
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1789334968128765952 |