Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005.
The shelfbreak current over the Beaufort Sea continental slope is known to be one of the most energetic features of the Beaufort Sea hydrography. In January 2005, three oceanographic moorings deployed over the Canadian (eastern) Beaufort Sea continental slope simultaneously recorded two consecutive...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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Online Access: | https://espace.inrs.ca/id/eprint/6488/ https://espace.inrs.ca/id/eprint/6488/1/P3175.pdf https://doi.org/10.1002/2015JC011514 |
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ftinrsquebec:oai:espace.inrs.ca:6488 2023-05-15T15:40:05+02:00 Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. Dmitrenko, Igor Kirillov, Sergei Forest, Alexandre Gratton, Yves Volkov, Denis L. Williams, William J. Lukovich, Jennifer Verlaine Bélanger, Claude Barber, David G. 2016 application/pdf https://espace.inrs.ca/id/eprint/6488/ https://espace.inrs.ca/id/eprint/6488/1/P3175.pdf https://doi.org/10.1002/2015JC011514 en eng https://espace.inrs.ca/id/eprint/6488/1/P3175.pdf Dmitrenko, Igor, Kirillov, Sergei, Forest, Alexandre, Gratton, Yves, Volkov, Denis L., Williams, William J., Lukovich, Jennifer Verlaine, Bélanger, Claude et Barber, David G. (2016). Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. Journal of Geophysical Research: Oceans , vol. 121 , nº 4. p. 2447-2468. DOI:10.1002/2015JC011514 <https://doi.org/10.1002/2015JC011514>. doi:10.1002/2015JC011514 Beaufort Sea continental slope downwelling mooring observations shelfbreak currents wind forcing Article Évalué par les pairs 2016 ftinrsquebec https://doi.org/10.1002/2015JC011514 2023-02-10T11:44:03Z The shelfbreak current over the Beaufort Sea continental slope is known to be one of the most energetic features of the Beaufort Sea hydrography. In January 2005, three oceanographic moorings deployed over the Canadian (eastern) Beaufort Sea continental slope simultaneously recorded two consecutive shelfbreak current events with along-slope eastward bottom-intensified flow up to 120 cm s⁻¹. Both events were generated by the local wind forcing associated with two Pacific-born cyclones passing north of the Beaufort Sea continental slope toward the Canadian Archipelago. Over the mooring array, the associated westerly wind exceeded 15 m s⁻¹. These two cyclones generated storm surges along the Beaufort Sea coast with sea surface height (SSH) rising up to 1.4 m following the two westerly wind maxima. We suggest that the westerly along-slope wind generated a surface Ekman onshore transport. The associated SSH increase over the shelf produced a cross-slope pressure gradient that drove an along-slope eastward geostrophic current, in the same direction as the wind. This wind-driven barotropic flow was superimposed on the background baroclinic bottom-intensified shelfbreak current that consequently amplified. Summer-fall satellite altimetry data for 1992–2013 show that the SSH gradient in the southeastern Beaufort Sea is enhanced over the upper continental slope in response to frequent storm surge events. Because the local wind forcing and/or sea-ice drift could not explain the reduction of sea-ice concentration over the Beaufort Sea continental slope in January 2005, we speculate that wind-driven sea level fluctuations may impact the sea-ice cover in winter. Article in Journal/Newspaper Beaufort Sea Canadian Archipelago Sea ice Institut national de la recherche scientifique, Québec: Espace INRS Pacific Journal of Geophysical Research: Oceans 121 4 2447 2468 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
English |
topic |
Beaufort Sea continental slope downwelling mooring observations shelfbreak currents wind forcing |
spellingShingle |
Beaufort Sea continental slope downwelling mooring observations shelfbreak currents wind forcing Dmitrenko, Igor Kirillov, Sergei Forest, Alexandre Gratton, Yves Volkov, Denis L. Williams, William J. Lukovich, Jennifer Verlaine Bélanger, Claude Barber, David G. Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. |
topic_facet |
Beaufort Sea continental slope downwelling mooring observations shelfbreak currents wind forcing |
description |
The shelfbreak current over the Beaufort Sea continental slope is known to be one of the most energetic features of the Beaufort Sea hydrography. In January 2005, three oceanographic moorings deployed over the Canadian (eastern) Beaufort Sea continental slope simultaneously recorded two consecutive shelfbreak current events with along-slope eastward bottom-intensified flow up to 120 cm s⁻¹. Both events were generated by the local wind forcing associated with two Pacific-born cyclones passing north of the Beaufort Sea continental slope toward the Canadian Archipelago. Over the mooring array, the associated westerly wind exceeded 15 m s⁻¹. These two cyclones generated storm surges along the Beaufort Sea coast with sea surface height (SSH) rising up to 1.4 m following the two westerly wind maxima. We suggest that the westerly along-slope wind generated a surface Ekman onshore transport. The associated SSH increase over the shelf produced a cross-slope pressure gradient that drove an along-slope eastward geostrophic current, in the same direction as the wind. This wind-driven barotropic flow was superimposed on the background baroclinic bottom-intensified shelfbreak current that consequently amplified. Summer-fall satellite altimetry data for 1992–2013 show that the SSH gradient in the southeastern Beaufort Sea is enhanced over the upper continental slope in response to frequent storm surge events. Because the local wind forcing and/or sea-ice drift could not explain the reduction of sea-ice concentration over the Beaufort Sea continental slope in January 2005, we speculate that wind-driven sea level fluctuations may impact the sea-ice cover in winter. |
format |
Article in Journal/Newspaper |
author |
Dmitrenko, Igor Kirillov, Sergei Forest, Alexandre Gratton, Yves Volkov, Denis L. Williams, William J. Lukovich, Jennifer Verlaine Bélanger, Claude Barber, David G. |
author_facet |
Dmitrenko, Igor Kirillov, Sergei Forest, Alexandre Gratton, Yves Volkov, Denis L. Williams, William J. Lukovich, Jennifer Verlaine Bélanger, Claude Barber, David G. |
author_sort |
Dmitrenko, Igor |
title |
Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. |
title_short |
Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. |
title_full |
Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. |
title_fullStr |
Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. |
title_full_unstemmed |
Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. |
title_sort |
shelfbreak current over the canadian beaufort sea continental slope: wind-driven events in january 2005. |
publishDate |
2016 |
url |
https://espace.inrs.ca/id/eprint/6488/ https://espace.inrs.ca/id/eprint/6488/1/P3175.pdf https://doi.org/10.1002/2015JC011514 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Beaufort Sea Canadian Archipelago Sea ice |
genre_facet |
Beaufort Sea Canadian Archipelago Sea ice |
op_relation |
https://espace.inrs.ca/id/eprint/6488/1/P3175.pdf Dmitrenko, Igor, Kirillov, Sergei, Forest, Alexandre, Gratton, Yves, Volkov, Denis L., Williams, William J., Lukovich, Jennifer Verlaine, Bélanger, Claude et Barber, David G. (2016). Shelfbreak current over the Canadian Beaufort Sea continental slope: Wind-driven events in January 2005. Journal of Geophysical Research: Oceans , vol. 121 , nº 4. p. 2447-2468. DOI:10.1002/2015JC011514 <https://doi.org/10.1002/2015JC011514>. doi:10.1002/2015JC011514 |
op_doi |
https://doi.org/10.1002/2015JC011514 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
4 |
container_start_page |
2447 |
op_container_end_page |
2468 |
_version_ |
1766372179941785600 |