Modification of Pacific water in the northern Canadian Arctic
The oceanography of the northern Canadian Arctic Archipelago (CAA) remains poorly studied. Here we present a unique set of conductivity–temperature–depth (CTD) and nitrate profiles collected in a fjord system around Axel Heiberg Island in the northern CAA during April–May 2022. The profiles are exam...
Published in: | Frontiers in Marine Science |
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Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2023
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Online Access: | https://curis.ku.dk/portal/da/publications/modification-of-pacific-water-in-the-northern-canadian-arctic(90e53a8b-9a09-47bb-ae31-acdb48d5b76d).html https://doi.org/10.3389/fmars.2023.1181800 https://curis.ku.dk/ws/files/360693643/fmars_10_1181800.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/90e53a8b-9a09-47bb-ae31-acdb48d5b76d 2024-06-09T07:42:24+00:00 Modification of Pacific water in the northern Canadian Arctic Dmitrenko, Igor A. Kirillov, Sergei A. Rudels, Bert Geilfus, Nicolas Xavier Ehn, Jens Babb, David G. Lilien, David A. Dahl-Jensen, Dorthe 2023-06-12 application/pdf https://curis.ku.dk/portal/da/publications/modification-of-pacific-water-in-the-northern-canadian-arctic(90e53a8b-9a09-47bb-ae31-acdb48d5b76d).html https://doi.org/10.3389/fmars.2023.1181800 https://curis.ku.dk/ws/files/360693643/fmars_10_1181800.pdf eng eng info:eu-repo/semantics/openAccess Dmitrenko , I A , Kirillov , S A , Rudels , B , Geilfus , N X , Ehn , J , Babb , D G , Lilien , D A & Dahl-Jensen , D 2023 , ' Modification of Pacific water in the northern Canadian Arctic ' , Frontiers in Marine Science , vol. 10 , 1181800 . https://doi.org/10.3389/fmars.2023.1181800 Atlantic water Canadian Arctic Archipelago ocean-glacier interaction Pacific-derived water vertical mixing article 2023 ftcopenhagenunip https://doi.org/10.3389/fmars.2023.1181800 2024-05-16T11:29:29Z The oceanography of the northern Canadian Arctic Archipelago (CAA) remains poorly studied. Here we present a unique set of conductivity–temperature–depth (CTD) and nitrate profiles collected in a fjord system around Axel Heiberg Island in the northern CAA during April–May 2022. The profiles are examined within the context of upstream observations in the Arctic Ocean and downstream observations in the central CAA, and reveal the origin of water masses and their interactions with ambient water from the continental slope and the nearby tidewater glacier outlet. The subsurface water (~25–180 m depth) is associated with the Pacific water outflow from the Arctic Ocean. The underlying halocline separates Pacific water from a deeper layer of polar water that has interacted with the warm (>0°C) Atlantic water observed below 240 m depth. Pacific water is significantly modified compared to the adjoining Arctic Ocean, as evidenced by the following details. Cold water intrusions from the tidewater glacier create deviations of ~0.25°C in the temperature profile through the subsurface water down to a depth of 140 m. Profiles show no thermal signature of Pacific summer water. Compared to the adjacent Arctic Ocean, the deeper fraction of Pacific-derived water and the Atlantic-modified polar water are warmer, while the underlying Atlantic water is colder. Overall, our results suggest that Pacific and Atlantic water in this area of the northern CAA are modified due to enhanced vertical mixing in a narrow band over the continental slope and shelf off the CAA, and are further modified by interactions with outlet glaciers in the area. This implies that tracing the initial thermohaline signature of the Pacific and Atlantic water flow through the CAA seems to be hardly possible without the use of additional tracers. We also find evidence of geothermal heating near the seafloor, which is not surprising given the observed presence of terrestrial geothermal vents around Axel Heiberg Island, and speculate this heat flux limits ice ... Article in Journal/Newspaper Arctic Arctic Archipelago Arctic Arctic Ocean Axel Heiberg Island Canadian Arctic Archipelago Tidewater University of Copenhagen: Research Arctic Arctic Ocean Axel Heiberg Island ENVELOPE(-91.001,-91.001,79.752,79.752) Canadian Arctic Archipelago Heiberg ENVELOPE(13.964,13.964,66.424,66.424) Pacific Frontiers in Marine Science 10 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Atlantic water Canadian Arctic Archipelago ocean-glacier interaction Pacific-derived water vertical mixing |
spellingShingle |
Atlantic water Canadian Arctic Archipelago ocean-glacier interaction Pacific-derived water vertical mixing Dmitrenko, Igor A. Kirillov, Sergei A. Rudels, Bert Geilfus, Nicolas Xavier Ehn, Jens Babb, David G. Lilien, David A. Dahl-Jensen, Dorthe Modification of Pacific water in the northern Canadian Arctic |
topic_facet |
Atlantic water Canadian Arctic Archipelago ocean-glacier interaction Pacific-derived water vertical mixing |
description |
The oceanography of the northern Canadian Arctic Archipelago (CAA) remains poorly studied. Here we present a unique set of conductivity–temperature–depth (CTD) and nitrate profiles collected in a fjord system around Axel Heiberg Island in the northern CAA during April–May 2022. The profiles are examined within the context of upstream observations in the Arctic Ocean and downstream observations in the central CAA, and reveal the origin of water masses and their interactions with ambient water from the continental slope and the nearby tidewater glacier outlet. The subsurface water (~25–180 m depth) is associated with the Pacific water outflow from the Arctic Ocean. The underlying halocline separates Pacific water from a deeper layer of polar water that has interacted with the warm (>0°C) Atlantic water observed below 240 m depth. Pacific water is significantly modified compared to the adjoining Arctic Ocean, as evidenced by the following details. Cold water intrusions from the tidewater glacier create deviations of ~0.25°C in the temperature profile through the subsurface water down to a depth of 140 m. Profiles show no thermal signature of Pacific summer water. Compared to the adjacent Arctic Ocean, the deeper fraction of Pacific-derived water and the Atlantic-modified polar water are warmer, while the underlying Atlantic water is colder. Overall, our results suggest that Pacific and Atlantic water in this area of the northern CAA are modified due to enhanced vertical mixing in a narrow band over the continental slope and shelf off the CAA, and are further modified by interactions with outlet glaciers in the area. This implies that tracing the initial thermohaline signature of the Pacific and Atlantic water flow through the CAA seems to be hardly possible without the use of additional tracers. We also find evidence of geothermal heating near the seafloor, which is not surprising given the observed presence of terrestrial geothermal vents around Axel Heiberg Island, and speculate this heat flux limits ice ... |
format |
Article in Journal/Newspaper |
author |
Dmitrenko, Igor A. Kirillov, Sergei A. Rudels, Bert Geilfus, Nicolas Xavier Ehn, Jens Babb, David G. Lilien, David A. Dahl-Jensen, Dorthe |
author_facet |
Dmitrenko, Igor A. Kirillov, Sergei A. Rudels, Bert Geilfus, Nicolas Xavier Ehn, Jens Babb, David G. Lilien, David A. Dahl-Jensen, Dorthe |
author_sort |
Dmitrenko, Igor A. |
title |
Modification of Pacific water in the northern Canadian Arctic |
title_short |
Modification of Pacific water in the northern Canadian Arctic |
title_full |
Modification of Pacific water in the northern Canadian Arctic |
title_fullStr |
Modification of Pacific water in the northern Canadian Arctic |
title_full_unstemmed |
Modification of Pacific water in the northern Canadian Arctic |
title_sort |
modification of pacific water in the northern canadian arctic |
publishDate |
2023 |
url |
https://curis.ku.dk/portal/da/publications/modification-of-pacific-water-in-the-northern-canadian-arctic(90e53a8b-9a09-47bb-ae31-acdb48d5b76d).html https://doi.org/10.3389/fmars.2023.1181800 https://curis.ku.dk/ws/files/360693643/fmars_10_1181800.pdf |
long_lat |
ENVELOPE(-91.001,-91.001,79.752,79.752) ENVELOPE(13.964,13.964,66.424,66.424) |
geographic |
Arctic Arctic Ocean Axel Heiberg Island Canadian Arctic Archipelago Heiberg Pacific |
geographic_facet |
Arctic Arctic Ocean Axel Heiberg Island Canadian Arctic Archipelago Heiberg Pacific |
genre |
Arctic Arctic Archipelago Arctic Arctic Ocean Axel Heiberg Island Canadian Arctic Archipelago Tidewater |
genre_facet |
Arctic Arctic Archipelago Arctic Arctic Ocean Axel Heiberg Island Canadian Arctic Archipelago Tidewater |
op_source |
Dmitrenko , I A , Kirillov , S A , Rudels , B , Geilfus , N X , Ehn , J , Babb , D G , Lilien , D A & Dahl-Jensen , D 2023 , ' Modification of Pacific water in the northern Canadian Arctic ' , Frontiers in Marine Science , vol. 10 , 1181800 . https://doi.org/10.3389/fmars.2023.1181800 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2023.1181800 |
container_title |
Frontiers in Marine Science |
container_volume |
10 |
_version_ |
1801371284225916928 |