Transports and pathways of overflow water in the Rockall Trough
Transports and pathways of overflow water in the Rockall Trough
Water mass analysis reveals a persistent core of deep overflow water within the Rockall Trough which hugs the northern and western boundaries of the basin. Mean speeds within this overflow are 10–15 cm s−1 giving a transport time from the Wyville Thomson Ridge to the central basin of <50 days. Analysis of the 40-year Extended Ellett Line record shows proportions of Norwegian Sea Deep Water associated with the deep core exceed 15% around one quarter of the time. We present the first transport estimates for overflow water in the Rockall Trough. This flux is for overflow water modified by mixing with a density greater than 27.65 kg m−3. Mean values calculated both from a newly deployed mooring array (OSNAP project) and indirectly from the Extended Ellett Line time-series are −0.3±0.04 Sv. Although the flux is highly variable there is no long term trend. As some overflow appears to exit into the Iceland Basin via channels between the northern banks, we suggest that the volume transport will likely increase as the flow pathway is traced back around the boundary of the Rockall Trough towards the Wyville Thomson Ridge.
48–59
Johnson, Clare
1246e01e-e0d5-499a-9521-77157ff734be
Sherwin, Toby
448c2bf6-bbb4-474f-9331-c94541919658
Cunningham, Stuart
5e27da4f-c201-47be-b9d3-c97d081b3b72
Dumont, Estelle
45d56b1c-0ae8-402d-83d0-2fa353952bc9
Houpert, Loïc
ef3a3c0f-8b4c-4555-a6c2-e107ca595412
Holliday, N. Penny
358b0b33-f30b-44fd-a193-88365bbf2c79
1 April 2017
Johnson, Clare
1246e01e-e0d5-499a-9521-77157ff734be
Sherwin, Toby
448c2bf6-bbb4-474f-9331-c94541919658
Cunningham, Stuart
5e27da4f-c201-47be-b9d3-c97d081b3b72
Dumont, Estelle
45d56b1c-0ae8-402d-83d0-2fa353952bc9
Houpert, Loïc
ef3a3c0f-8b4c-4555-a6c2-e107ca595412
Holliday, N. Penny
358b0b33-f30b-44fd-a193-88365bbf2c79
Johnson, Clare, Sherwin, Toby, Cunningham, Stuart, Dumont, Estelle, Houpert, Loïc and Holliday, N. Penny
(2017)
Transports and pathways of overflow water in the Rockall Trough.
Deep Sea Research Part I: Oceanographic Research Papers, 122, .
(doi:10.1016/j.dsr.2017.02.004).
Abstract
Water mass analysis reveals a persistent core of deep overflow water within the Rockall Trough which hugs the northern and western boundaries of the basin. Mean speeds within this overflow are 10–15 cm s−1 giving a transport time from the Wyville Thomson Ridge to the central basin of <50 days. Analysis of the 40-year Extended Ellett Line record shows proportions of Norwegian Sea Deep Water associated with the deep core exceed 15% around one quarter of the time. We present the first transport estimates for overflow water in the Rockall Trough. This flux is for overflow water modified by mixing with a density greater than 27.65 kg m−3. Mean values calculated both from a newly deployed mooring array (OSNAP project) and indirectly from the Extended Ellett Line time-series are −0.3±0.04 Sv. Although the flux is highly variable there is no long term trend. As some overflow appears to exit into the Iceland Basin via channels between the northern banks, we suggest that the volume transport will likely increase as the flow pathway is traced back around the boundary of the Rockall Trough towards the Wyville Thomson Ridge.
Text
1-s2.0-S0967063716302503-main
- Accepted Manuscript
More information
Accepted/In Press date: 10 February 2017
Published date: 1 April 2017
Organisations:
National Oceanography Centre, Marine Physics and Ocean Climate
Identifiers
Local EPrints ID: 406147
URI: http://eprints.soton.ac.uk/id/eprint/406147
ISSN: 0967-0637
PURE UUID: a255b99d-2b5a-48c5-8e47-5c37ebd9ade4
Catalogue record
Date deposited: 10 Mar 2017 10:40
Last modified: 16 Mar 2024 05:07
Export record
Altmetrics
Contributors
Author:
Clare Johnson
Author:
Toby Sherwin
Author:
Stuart Cunningham
Author:
Estelle Dumont
Author:
Loïc Houpert
Author:
N. Penny Holliday
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics