Shelf/fjord exchange driven by coastal-trapped waves in the Arctic
In this article, we show that the class of low frequency (subinertial) waves known as coastal-trapped waves (CTWs) are a significant agent of water volume exchange in a west Svalbard fjord, and by extension more widely along the west Svalbard and east Greenland margins where similar conditions preva...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hdl.handle.net/10037/24985 https://doi.org/10.1002/2015JC011277 |
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ftunivtroemsoe:oai:munin.uit.no:10037/24985 2023-05-15T14:25:30+02:00 Shelf/fjord exchange driven by coastal-trapped waves in the Arctic Inall, Mark E. Nilsen, Frank Cottier, Finlo Robert Daae, Ragnhild Lundmark 2015-11-23 https://hdl.handle.net/10037/24985 https://doi.org/10.1002/2015JC011277 eng eng Wiley Journal of Geophysical Research (JGR): Oceans Inall ME, Nilsen F, Cottier FR, Daae RL. Shelf/fjord exchange driven by coastal-trapped waves in the Arctic. Journal of Geophysical Research (JGR): Oceans. 2015;120(12):8283-8303 FRIDAID 1335547 doi:10.1002/2015JC011277 2169-9275 2169-9291 https://hdl.handle.net/10037/24985 openAccess Copyright 2015 The Author(s) Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2015 ftunivtroemsoe https://doi.org/10.1002/2015JC011277 2022-05-04T22:58:43Z In this article, we show that the class of low frequency (subinertial) waves known as coastal-trapped waves (CTWs) are a significant agent of water volume exchange in a west Svalbard fjord, and by extension more widely along the west Svalbard and east Greenland margins where similar conditions prevail. We show that CTWs generated by weather systems passing across the sloping topography of the shelf break propagate into the fjord, steered by the topography of an across-shelf trough. The CTWs have characteristic periods of ∼2 days, set by the passage time of weather systems. Phase speeds and wavelengths vary seasonally by a factor of two, according to stratification: winter (summer) values are C p = 0.25 ms −1 (0.5 ms −1 ) and λ = 40 km (84 km). CTW-induced flow velocities in excess of 0.2 ms −1 at 100 m water depth are recorded. Observationally scaled CTW model results allow their explicit role in volume exchange to be quantified. Of the estimated exchange terms, estuarine exchange is weakest (Q est =0.62x10 3 m 3 s -1 ), followed by barotropic tidal pumping (Q bt =2.5x10 3 m 3 s -1 )with intermediary exchange dominating (Q i =2.4x10 4 m 3 s -1 ). Oscillatory flows display greatest activity in the 1–5 day period band, and CTW activity is identified as the likely source of variability in the 40–60 h period band. Within that band, intermediary exchange driven by CTWs is estimated as Q i CTW_ave =0.82x10 4 m 3 s -1 an exchange rate exceeding both barotropic and estuarine exchange estimates. Article in Journal/Newspaper Arctic Arctic East Greenland Greenland Svalbard University of Tromsø: Munin Open Research Archive Arctic Greenland Svalbard Journal of Geophysical Research: Oceans 120 12 8283 8303 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
In this article, we show that the class of low frequency (subinertial) waves known as coastal-trapped waves (CTWs) are a significant agent of water volume exchange in a west Svalbard fjord, and by extension more widely along the west Svalbard and east Greenland margins where similar conditions prevail. We show that CTWs generated by weather systems passing across the sloping topography of the shelf break propagate into the fjord, steered by the topography of an across-shelf trough. The CTWs have characteristic periods of ∼2 days, set by the passage time of weather systems. Phase speeds and wavelengths vary seasonally by a factor of two, according to stratification: winter (summer) values are C p = 0.25 ms −1 (0.5 ms −1 ) and λ = 40 km (84 km). CTW-induced flow velocities in excess of 0.2 ms −1 at 100 m water depth are recorded. Observationally scaled CTW model results allow their explicit role in volume exchange to be quantified. Of the estimated exchange terms, estuarine exchange is weakest (Q est =0.62x10 3 m 3 s -1 ), followed by barotropic tidal pumping (Q bt =2.5x10 3 m 3 s -1 )with intermediary exchange dominating (Q i =2.4x10 4 m 3 s -1 ). Oscillatory flows display greatest activity in the 1–5 day period band, and CTW activity is identified as the likely source of variability in the 40–60 h period band. Within that band, intermediary exchange driven by CTWs is estimated as Q i CTW_ave =0.82x10 4 m 3 s -1 an exchange rate exceeding both barotropic and estuarine exchange estimates. |
format |
Article in Journal/Newspaper |
author |
Inall, Mark E. Nilsen, Frank Cottier, Finlo Robert Daae, Ragnhild Lundmark |
spellingShingle |
Inall, Mark E. Nilsen, Frank Cottier, Finlo Robert Daae, Ragnhild Lundmark Shelf/fjord exchange driven by coastal-trapped waves in the Arctic |
author_facet |
Inall, Mark E. Nilsen, Frank Cottier, Finlo Robert Daae, Ragnhild Lundmark |
author_sort |
Inall, Mark E. |
title |
Shelf/fjord exchange driven by coastal-trapped waves in the Arctic |
title_short |
Shelf/fjord exchange driven by coastal-trapped waves in the Arctic |
title_full |
Shelf/fjord exchange driven by coastal-trapped waves in the Arctic |
title_fullStr |
Shelf/fjord exchange driven by coastal-trapped waves in the Arctic |
title_full_unstemmed |
Shelf/fjord exchange driven by coastal-trapped waves in the Arctic |
title_sort |
shelf/fjord exchange driven by coastal-trapped waves in the arctic |
publisher |
Wiley |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/24985 https://doi.org/10.1002/2015JC011277 |
geographic |
Arctic Greenland Svalbard |
geographic_facet |
Arctic Greenland Svalbard |
genre |
Arctic Arctic East Greenland Greenland Svalbard |
genre_facet |
Arctic Arctic East Greenland Greenland Svalbard |
op_relation |
Journal of Geophysical Research (JGR): Oceans Inall ME, Nilsen F, Cottier FR, Daae RL. Shelf/fjord exchange driven by coastal-trapped waves in the Arctic. Journal of Geophysical Research (JGR): Oceans. 2015;120(12):8283-8303 FRIDAID 1335547 doi:10.1002/2015JC011277 2169-9275 2169-9291 https://hdl.handle.net/10037/24985 |
op_rights |
openAccess Copyright 2015 The Author(s) |
op_doi |
https://doi.org/10.1002/2015JC011277 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
120 |
container_issue |
12 |
container_start_page |
8283 |
op_container_end_page |
8303 |
_version_ |
1766297884891807744 |