Atlantic water flow through the Faroese Channels
Through the Faroese Channels – the collective name for a system of channels linking the Faroe–Shetland Channel, Wyville Thomson Basin, and Faroe Bank Channel – there is a deep flow of cold waters from Arctic regions that exit the system as overflow through the Faroe Bank Channel and across the Wyvil...
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Online Access: | https://doi.org/10.5194/os-13-873-2017 https://os.copernicus.org/articles/13/873/2017/ |
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ftcopernicus:oai:publications.copernicus.org:os59315 2023-05-15T15:03:46+02:00 Atlantic water flow through the Faroese Channels Hansen, Bogi Poulsen, Turið Húsgarð Larsen, Karin Margretha Hátún, Hjálmar Østerhus, Svein Darelius, Elin Berx, Barbara Quadfasel, Detlef Jochumsen, Kerstin 2018-09-06 application/pdf https://doi.org/10.5194/os-13-873-2017 https://os.copernicus.org/articles/13/873/2017/ eng eng doi:10.5194/os-13-873-2017 https://os.copernicus.org/articles/13/873/2017/ eISSN: 1812-0792 Text 2018 ftcopernicus https://doi.org/10.5194/os-13-873-2017 2020-07-20T16:23:33Z Through the Faroese Channels – the collective name for a system of channels linking the Faroe–Shetland Channel, Wyville Thomson Basin, and Faroe Bank Channel – there is a deep flow of cold waters from Arctic regions that exit the system as overflow through the Faroe Bank Channel and across the Wyville Thomson Ridge. The upper layers, in contrast, are dominated by warm, saline water masses from the southwest, termed Atlantic water. In spite of intensive research over more than a century, there are still open questions on the passage of these waters through the system with conflicting views in recent literature. Of special note is the suggestion that there is a flow of Atlantic water from the Faroe–Shetland Channel through the Faroe Bank Channel, which circles the Faroes over the slope region in a clockwise direction. Here, we combine the observational evidence from ship-borne hydrography, moored current measurements, surface drifter tracks, and satellite altimetry to address these questions and propose a general scheme for the Atlantic water flow through this channel system. We find no evidence for a continuous flow of Atlantic water from the Faroe–Shetland Channel to the Faroe Bank Channel over the Faroese slope. Rather, the southwestward-flowing water over the Faroese slope of the Faroe–Shetland Channel is totally recirculated within the combined area of the Faroe–Shetland Channel and Wyville Thomson Basin, except possibly for a small release in the form of eddies. This does not exclude a possible westward flow over the southern tip of the Faroe Shelf, but even including that, we estimate that the average volume transport of a <q>Circum-Faroe Current</q> does not exceed 0.5 Sv (1 Sv = 10 6 m 3 s −1 ). Also, there seems to be a persistent flow of Atlantic water from the western part of the Faroe Bank Channel into the Faroe–Shetland Channel that joins the Slope Current over the Scottish slope. These conclusions will affect potential impacts from offshore activities in the region and they imply that recently published observational estimates of the transport of warm water towards the Arctic obtained by different methods are incompatible. Text Arctic Faroes Copernicus Publications: E-Journals Arctic Faroe Bank ENVELOPE(-8.667,-8.667,60.917,60.917) Faroe Shelf ENVELOPE(-6.000,-6.000,62.000,62.000) Wyville Thomson Ridge ENVELOPE(-7.500,-7.500,60.250,60.250) Wyville-Thomson Ridge ENVELOPE(-7.250,-7.250,60.000,60.000) Ocean Science 13 6 873 888 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Through the Faroese Channels – the collective name for a system of channels linking the Faroe–Shetland Channel, Wyville Thomson Basin, and Faroe Bank Channel – there is a deep flow of cold waters from Arctic regions that exit the system as overflow through the Faroe Bank Channel and across the Wyville Thomson Ridge. The upper layers, in contrast, are dominated by warm, saline water masses from the southwest, termed Atlantic water. In spite of intensive research over more than a century, there are still open questions on the passage of these waters through the system with conflicting views in recent literature. Of special note is the suggestion that there is a flow of Atlantic water from the Faroe–Shetland Channel through the Faroe Bank Channel, which circles the Faroes over the slope region in a clockwise direction. Here, we combine the observational evidence from ship-borne hydrography, moored current measurements, surface drifter tracks, and satellite altimetry to address these questions and propose a general scheme for the Atlantic water flow through this channel system. We find no evidence for a continuous flow of Atlantic water from the Faroe–Shetland Channel to the Faroe Bank Channel over the Faroese slope. Rather, the southwestward-flowing water over the Faroese slope of the Faroe–Shetland Channel is totally recirculated within the combined area of the Faroe–Shetland Channel and Wyville Thomson Basin, except possibly for a small release in the form of eddies. This does not exclude a possible westward flow over the southern tip of the Faroe Shelf, but even including that, we estimate that the average volume transport of a <q>Circum-Faroe Current</q> does not exceed 0.5 Sv (1 Sv = 10 6 m 3 s −1 ). Also, there seems to be a persistent flow of Atlantic water from the western part of the Faroe Bank Channel into the Faroe–Shetland Channel that joins the Slope Current over the Scottish slope. These conclusions will affect potential impacts from offshore activities in the region and they imply that recently published observational estimates of the transport of warm water towards the Arctic obtained by different methods are incompatible. |
format |
Text |
author |
Hansen, Bogi Poulsen, Turið Húsgarð Larsen, Karin Margretha Hátún, Hjálmar Østerhus, Svein Darelius, Elin Berx, Barbara Quadfasel, Detlef Jochumsen, Kerstin |
spellingShingle |
Hansen, Bogi Poulsen, Turið Húsgarð Larsen, Karin Margretha Hátún, Hjálmar Østerhus, Svein Darelius, Elin Berx, Barbara Quadfasel, Detlef Jochumsen, Kerstin Atlantic water flow through the Faroese Channels |
author_facet |
Hansen, Bogi Poulsen, Turið Húsgarð Larsen, Karin Margretha Hátún, Hjálmar Østerhus, Svein Darelius, Elin Berx, Barbara Quadfasel, Detlef Jochumsen, Kerstin |
author_sort |
Hansen, Bogi |
title |
Atlantic water flow through the Faroese Channels |
title_short |
Atlantic water flow through the Faroese Channels |
title_full |
Atlantic water flow through the Faroese Channels |
title_fullStr |
Atlantic water flow through the Faroese Channels |
title_full_unstemmed |
Atlantic water flow through the Faroese Channels |
title_sort |
atlantic water flow through the faroese channels |
publishDate |
2018 |
url |
https://doi.org/10.5194/os-13-873-2017 https://os.copernicus.org/articles/13/873/2017/ |
long_lat |
ENVELOPE(-8.667,-8.667,60.917,60.917) ENVELOPE(-6.000,-6.000,62.000,62.000) ENVELOPE(-7.500,-7.500,60.250,60.250) ENVELOPE(-7.250,-7.250,60.000,60.000) |
geographic |
Arctic Faroe Bank Faroe Shelf Wyville Thomson Ridge Wyville-Thomson Ridge |
geographic_facet |
Arctic Faroe Bank Faroe Shelf Wyville Thomson Ridge Wyville-Thomson Ridge |
genre |
Arctic Faroes |
genre_facet |
Arctic Faroes |
op_source |
eISSN: 1812-0792 |
op_relation |
doi:10.5194/os-13-873-2017 https://os.copernicus.org/articles/13/873/2017/ |
op_doi |
https://doi.org/10.5194/os-13-873-2017 |
container_title |
Ocean Science |
container_volume |
13 |
container_issue |
6 |
container_start_page |
873 |
op_container_end_page |
888 |
_version_ |
1766335623682064384 |