Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea
The Atlantic Water flow from the Barents and Kara seas to the Arctic Ocean through the St. Anna Trough (SAT) is conditioned by interaction between Fram Strait branch water circulating in the SAT and Barents Sea branch water—both of Atlantic origin. Here we present data from an oceanographic mooring...
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ftnerc:oai:nora.nerc.ac.uk:511367 2023-05-15T14:27:33+02:00 Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea Dmitrenko, Igor A. Rudels, Bert Kirillov, Sergey A. Aksenov, Yevgeny O. Lien, Vidar S. Ivanov, Vladimir V. Schauer, Ursula Polyakov, Igor V. Coward, Andrew Barber, David G. 2015-07 text http://nora.nerc.ac.uk/id/eprint/511367/ https://nora.nerc.ac.uk/id/eprint/511367/1/jgrc21331.pdf https://doi.org/10.1002/2015JC010804 en eng https://nora.nerc.ac.uk/id/eprint/511367/1/jgrc21331.pdf Dmitrenko, Igor A.; Rudels, Bert; Kirillov, Sergey A.; Aksenov, Yevgeny O. orcid:0000-0001-6132-3434 Lien, Vidar S.; Ivanov, Vladimir V.; Schauer, Ursula; Polyakov, Igor V.; Coward, Andrew orcid:0000-0002-9111-7700 Barber, David G. 2015 Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea. Journal of Geophysical Research: Oceans, 120 (7). 5158-5178. https://doi.org/10.1002/2015JC010804 <https://doi.org/10.1002/2015JC010804> Marine Sciences Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1002/2015JC010804 2023-02-04T19:41:53Z The Atlantic Water flow from the Barents and Kara seas to the Arctic Ocean through the St. Anna Trough (SAT) is conditioned by interaction between Fram Strait branch water circulating in the SAT and Barents Sea branch water—both of Atlantic origin. Here we present data from an oceanographic mooring deployed on the eastern flank of the SAT from September 2009 to September 2010 as well as CTD (conductivity-temperature-depth) sections across the SAT. A distinct vertical density front over the SAT eastern slope deeper than ∼50 m is attributed to the outflow of Barents Sea branch water to the Arctic Ocean. In turn, the Barents Sea branch water flow to the Arctic Ocean is conditioned by two water masses defined by relative low and high fractions of the Atlantic Water. They are also traceable in the Nansen Basin downstream of the SAT entrance. A persistent northward current was recorded in the subsurface layer along the SAT eastern slope with a mean velocity of 18 cm s−1 at 134–218 m and 23 cm s−1 at 376–468 m. Observations and modeling suggest that the SAT flow has a significant density-driven component. It is therefore expected to respond to changes in the cross-trough density gradient conditioned by interaction between the Fram Strait and Barents Sea branches. Further modeling efforts are necessary to investigate hydrodynamic instability and eddy generation caused by the interaction between the SAT flow and the Arctic Ocean Fram Strait branch water boundary current. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Barents Sea Fram Strait Kara Sea Nansen Nansen Basin Natural Environment Research Council: NERC Open Research Archive Arctic Arctic Ocean Barents Sea Kara Sea St. Anna Trough ENVELOPE(69.500,69.500,80.750,80.750) Journal of Geophysical Research: Oceans 120 7 5158 5178 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences |
spellingShingle |
Marine Sciences Dmitrenko, Igor A. Rudels, Bert Kirillov, Sergey A. Aksenov, Yevgeny O. Lien, Vidar S. Ivanov, Vladimir V. Schauer, Ursula Polyakov, Igor V. Coward, Andrew Barber, David G. Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea |
topic_facet |
Marine Sciences |
description |
The Atlantic Water flow from the Barents and Kara seas to the Arctic Ocean through the St. Anna Trough (SAT) is conditioned by interaction between Fram Strait branch water circulating in the SAT and Barents Sea branch water—both of Atlantic origin. Here we present data from an oceanographic mooring deployed on the eastern flank of the SAT from September 2009 to September 2010 as well as CTD (conductivity-temperature-depth) sections across the SAT. A distinct vertical density front over the SAT eastern slope deeper than ∼50 m is attributed to the outflow of Barents Sea branch water to the Arctic Ocean. In turn, the Barents Sea branch water flow to the Arctic Ocean is conditioned by two water masses defined by relative low and high fractions of the Atlantic Water. They are also traceable in the Nansen Basin downstream of the SAT entrance. A persistent northward current was recorded in the subsurface layer along the SAT eastern slope with a mean velocity of 18 cm s−1 at 134–218 m and 23 cm s−1 at 376–468 m. Observations and modeling suggest that the SAT flow has a significant density-driven component. It is therefore expected to respond to changes in the cross-trough density gradient conditioned by interaction between the Fram Strait and Barents Sea branches. Further modeling efforts are necessary to investigate hydrodynamic instability and eddy generation caused by the interaction between the SAT flow and the Arctic Ocean Fram Strait branch water boundary current. |
format |
Article in Journal/Newspaper |
author |
Dmitrenko, Igor A. Rudels, Bert Kirillov, Sergey A. Aksenov, Yevgeny O. Lien, Vidar S. Ivanov, Vladimir V. Schauer, Ursula Polyakov, Igor V. Coward, Andrew Barber, David G. |
author_facet |
Dmitrenko, Igor A. Rudels, Bert Kirillov, Sergey A. Aksenov, Yevgeny O. Lien, Vidar S. Ivanov, Vladimir V. Schauer, Ursula Polyakov, Igor V. Coward, Andrew Barber, David G. |
author_sort |
Dmitrenko, Igor A. |
title |
Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea |
title_short |
Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea |
title_full |
Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea |
title_fullStr |
Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea |
title_full_unstemmed |
Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea |
title_sort |
atlantic water flow into the arctic ocean through the st. anna trough in the northern kara sea |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/511367/ https://nora.nerc.ac.uk/id/eprint/511367/1/jgrc21331.pdf https://doi.org/10.1002/2015JC010804 |
long_lat |
ENVELOPE(69.500,69.500,80.750,80.750) |
geographic |
Arctic Arctic Ocean Barents Sea Kara Sea St. Anna Trough |
geographic_facet |
Arctic Arctic Ocean Barents Sea Kara Sea St. Anna Trough |
genre |
Arctic Arctic Arctic Ocean Barents Sea Fram Strait Kara Sea Nansen Nansen Basin |
genre_facet |
Arctic Arctic Arctic Ocean Barents Sea Fram Strait Kara Sea Nansen Nansen Basin |
op_relation |
https://nora.nerc.ac.uk/id/eprint/511367/1/jgrc21331.pdf Dmitrenko, Igor A.; Rudels, Bert; Kirillov, Sergey A.; Aksenov, Yevgeny O. orcid:0000-0001-6132-3434 Lien, Vidar S.; Ivanov, Vladimir V.; Schauer, Ursula; Polyakov, Igor V.; Coward, Andrew orcid:0000-0002-9111-7700 Barber, David G. 2015 Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea. Journal of Geophysical Research: Oceans, 120 (7). 5158-5178. https://doi.org/10.1002/2015JC010804 <https://doi.org/10.1002/2015JC010804> |
op_doi |
https://doi.org/10.1002/2015JC010804 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
120 |
container_issue |
7 |
container_start_page |
5158 |
op_container_end_page |
5178 |
_version_ |
1766301351615135744 |