Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements
One-year long time series of current velocity and temperature from eight moorings deployed in the Faroe Bank Channel (FBC) are analysed to describe the structure and variability of the dense overflow plume on daily to seasonal timescales. Mooring arrays were deployed in two sections: located 25 km d...
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2016
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Online Access: | https://doi.org/10.5194/os-12-451-2016 http://www.ocean-sci.net/12/451/2016/os-12-451-2016.pdf https://doaj.org/article/0ef40a343f5946909801147627e0c094 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:0ef40a343f5946909801147627e0c094 2023-05-15T16:51:46+02:00 Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements J. E. Ullgren E. Darelius I. Fer 2016-03-01 https://doi.org/10.5194/os-12-451-2016 http://www.ocean-sci.net/12/451/2016/os-12-451-2016.pdf https://doaj.org/article/0ef40a343f5946909801147627e0c094 en eng Copernicus Publications 1812-0784 1812-0792 doi:10.5194/os-12-451-2016 http://www.ocean-sci.net/12/451/2016/os-12-451-2016.pdf https://doaj.org/article/0ef40a343f5946909801147627e0c094 undefined Ocean Science, Vol 12, Iss 2, Pp 451-470 (2016) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.5194/os-12-451-2016 2023-01-22T19:28:45Z One-year long time series of current velocity and temperature from eight moorings deployed in the Faroe Bank Channel (FBC) are analysed to describe the structure and variability of the dense overflow plume on daily to seasonal timescales. Mooring arrays were deployed in two sections: located 25 km downstream of the main sill, in the channel that geographically confines the overflow plume at both edges (section C), and 60 km further downstream, over the slope (section S). At section C, the average volume transport of overflow waters ( < 3 °C) from the Nordic Seas towards the Iceland Basin was 1.3 ± 0.3 Sv; at section S, transport of modified overflow water ( < 6 °C) was 1.7 ± 0.7 Sv. The volume transport through the slope section was dominated by mesoscale variability at 3–5-day timescales. A simplified view of along-path entrainment of a gravity current may not be accurate for the FBC overflow. As the plume proceeds into the stratified ambient water, there is substantial detrainment from the deeper layer (bounded by the 3 °C isotherm), of comparable magnitude to the entrainment into the interfacial layer (between the 3 and 6 °C isotherms). A time series of gradient Richardson numbers suggests a quiescent plume core capped by turbulent near bottom and interfacial layers in the channel. At section S, in contrast, the entire overflow plume is turbulent. Based on a two-layer heat budget constructed for the overflow, time mean vertical diffusivities across the top of the bottom layer and across the interfacial layer were (30 ± 15) × 10−4 and (120 ± 43) × 10−4 m2 s−1, respectively. Article in Journal/Newspaper Iceland Nordic Seas Unknown Faroe Bank ENVELOPE(-8.667,-8.667,60.917,60.917) Ocean Science 12 2 451 470 |
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language |
English |
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geo envir |
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geo envir J. E. Ullgren E. Darelius I. Fer Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements |
topic_facet |
geo envir |
description |
One-year long time series of current velocity and temperature from eight moorings deployed in the Faroe Bank Channel (FBC) are analysed to describe the structure and variability of the dense overflow plume on daily to seasonal timescales. Mooring arrays were deployed in two sections: located 25 km downstream of the main sill, in the channel that geographically confines the overflow plume at both edges (section C), and 60 km further downstream, over the slope (section S). At section C, the average volume transport of overflow waters ( < 3 °C) from the Nordic Seas towards the Iceland Basin was 1.3 ± 0.3 Sv; at section S, transport of modified overflow water ( < 6 °C) was 1.7 ± 0.7 Sv. The volume transport through the slope section was dominated by mesoscale variability at 3–5-day timescales. A simplified view of along-path entrainment of a gravity current may not be accurate for the FBC overflow. As the plume proceeds into the stratified ambient water, there is substantial detrainment from the deeper layer (bounded by the 3 °C isotherm), of comparable magnitude to the entrainment into the interfacial layer (between the 3 and 6 °C isotherms). A time series of gradient Richardson numbers suggests a quiescent plume core capped by turbulent near bottom and interfacial layers in the channel. At section S, in contrast, the entire overflow plume is turbulent. Based on a two-layer heat budget constructed for the overflow, time mean vertical diffusivities across the top of the bottom layer and across the interfacial layer were (30 ± 15) × 10−4 and (120 ± 43) × 10−4 m2 s−1, respectively. |
format |
Article in Journal/Newspaper |
author |
J. E. Ullgren E. Darelius I. Fer |
author_facet |
J. E. Ullgren E. Darelius I. Fer |
author_sort |
J. E. Ullgren |
title |
Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements |
title_short |
Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements |
title_full |
Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements |
title_fullStr |
Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements |
title_full_unstemmed |
Volume transport and mixing of the Faroe Bank Channel overflow from one year of moored measurements |
title_sort |
volume transport and mixing of the faroe bank channel overflow from one year of moored measurements |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/os-12-451-2016 http://www.ocean-sci.net/12/451/2016/os-12-451-2016.pdf https://doaj.org/article/0ef40a343f5946909801147627e0c094 |
long_lat |
ENVELOPE(-8.667,-8.667,60.917,60.917) |
geographic |
Faroe Bank |
geographic_facet |
Faroe Bank |
genre |
Iceland Nordic Seas |
genre_facet |
Iceland Nordic Seas |
op_source |
Ocean Science, Vol 12, Iss 2, Pp 451-470 (2016) |
op_relation |
1812-0784 1812-0792 doi:10.5194/os-12-451-2016 http://www.ocean-sci.net/12/451/2016/os-12-451-2016.pdf https://doaj.org/article/0ef40a343f5946909801147627e0c094 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/os-12-451-2016 |
container_title |
Ocean Science |
container_volume |
12 |
container_issue |
2 |
container_start_page |
451 |
op_container_end_page |
470 |
_version_ |
1766041871281291264 |