Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean
In September 2013, we observed an expanse of surface water with low CO 2 partial pressure ( p CO 2 sea ) (< 200 µatm) in the Chukchi Sea of the western Arctic Ocean. The large undersaturation of CO 2 in this region was the result of massive primary production after the sea-ice retreat in June and...
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ftdoajarticles:oai:doaj.org/article:b27c2b5e9ad94a7cbc0754f6008323de 2023-05-15T15:00:40+02:00 Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean N. Kosugi D. Sasano M. Ishii S. Nishino H. Uchida H. Yoshikawa-Inoue 2017-12-01T00:00:00Z https://doi.org/10.5194/bg-14-5727-2017 https://doaj.org/article/b27c2b5e9ad94a7cbc0754f6008323de EN eng Copernicus Publications https://www.biogeosciences.net/14/5727/2017/bg-14-5727-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-14-5727-2017 1726-4170 1726-4189 https://doaj.org/article/b27c2b5e9ad94a7cbc0754f6008323de Biogeosciences, Vol 14, Pp 5727-5739 (2017) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/bg-14-5727-2017 2022-12-31T05:55:57Z In September 2013, we observed an expanse of surface water with low CO 2 partial pressure ( p CO 2 sea ) (< 200 µatm) in the Chukchi Sea of the western Arctic Ocean. The large undersaturation of CO 2 in this region was the result of massive primary production after the sea-ice retreat in June and July. In the surface of the Canada Basin, salinity was low (< 27) and p CO 2 sea was closer to the air–sea CO 2 equilibrium (∼ 360 µatm). From the relationships between salinity and total alkalinity, we confirmed that the low salinity in the Canada Basin was due to the larger fraction of meltwater input (∼ 0.16) rather than the riverine discharge (∼ 0.1). Such an increase in p CO 2 sea was not so clear in the coastal region near Point Barrow, where the fraction of riverine discharge was larger than that of sea-ice melt. We also identified low p CO 2 sea (< 250 µatm) in the depth of 30–50 m under the halocline of the Canada Basin. This subsurface low p CO 2 sea was attributed to the advection of Pacific-origin water, in which dissolved inorganic carbon is relatively low, through the Chukchi Sea where net primary production is high. Oxygen supersaturation (> 20 µmol kg −1 ) in the subsurface low p CO 2 sea layer in the Canada Basin indicated significant net primary production undersea and/or in preformed condition. If these low p CO 2 sea layers surface by wind mixing, they will act as additional CO 2 sinks; however, this is unlikely because intensification of stratification by sea-ice melt inhibits mixing across the halocline. Article in Journal/Newspaper Arctic Arctic Ocean canada basin Chukchi Chukchi Sea Point Barrow Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Chukchi Sea Canada Pacific Biogeosciences 14 24 5727 5739 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 N. Kosugi D. Sasano M. Ishii S. Nishino H. Uchida H. Yoshikawa-Inoue Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
In September 2013, we observed an expanse of surface water with low CO 2 partial pressure ( p CO 2 sea ) (< 200 µatm) in the Chukchi Sea of the western Arctic Ocean. The large undersaturation of CO 2 in this region was the result of massive primary production after the sea-ice retreat in June and July. In the surface of the Canada Basin, salinity was low (< 27) and p CO 2 sea was closer to the air–sea CO 2 equilibrium (∼ 360 µatm). From the relationships between salinity and total alkalinity, we confirmed that the low salinity in the Canada Basin was due to the larger fraction of meltwater input (∼ 0.16) rather than the riverine discharge (∼ 0.1). Such an increase in p CO 2 sea was not so clear in the coastal region near Point Barrow, where the fraction of riverine discharge was larger than that of sea-ice melt. We also identified low p CO 2 sea (< 250 µatm) in the depth of 30–50 m under the halocline of the Canada Basin. This subsurface low p CO 2 sea was attributed to the advection of Pacific-origin water, in which dissolved inorganic carbon is relatively low, through the Chukchi Sea where net primary production is high. Oxygen supersaturation (> 20 µmol kg −1 ) in the subsurface low p CO 2 sea layer in the Canada Basin indicated significant net primary production undersea and/or in preformed condition. If these low p CO 2 sea layers surface by wind mixing, they will act as additional CO 2 sinks; however, this is unlikely because intensification of stratification by sea-ice melt inhibits mixing across the halocline. |
format |
Article in Journal/Newspaper |
author |
N. Kosugi D. Sasano M. Ishii S. Nishino H. Uchida H. Yoshikawa-Inoue |
author_facet |
N. Kosugi D. Sasano M. Ishii S. Nishino H. Uchida H. Yoshikawa-Inoue |
author_sort |
N. Kosugi |
title |
Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_short |
Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_full |
Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_fullStr |
Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_full_unstemmed |
Low p CO 2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_sort |
low p co 2 under sea-ice melt in the canada basin of the western arctic ocean |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/bg-14-5727-2017 https://doaj.org/article/b27c2b5e9ad94a7cbc0754f6008323de |
geographic |
Arctic Arctic Ocean Chukchi Sea Canada Pacific |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Canada Pacific |
genre |
Arctic Arctic Ocean canada basin Chukchi Chukchi Sea Point Barrow Sea ice |
genre_facet |
Arctic Arctic Ocean canada basin Chukchi Chukchi Sea Point Barrow Sea ice |
op_source |
Biogeosciences, Vol 14, Pp 5727-5739 (2017) |
op_relation |
https://www.biogeosciences.net/14/5727/2017/bg-14-5727-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-14-5727-2017 1726-4170 1726-4189 https://doaj.org/article/b27c2b5e9ad94a7cbc0754f6008323de |
op_doi |
https://doi.org/10.5194/bg-14-5727-2017 |
container_title |
Biogeosciences |
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14 |
container_issue |
24 |
container_start_page |
5727 |
op_container_end_page |
5739 |
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1766332747505205248 |