Low pCO2 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 CO2 partial pressure (pCO2sea) (< 200 µatm) in the Chukchi Sea of the western Arctic Ocean. The large undersaturation of CO2 in this region was the result of massive primary production after the sea-ice retreat in June and July....
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Copernicus Publications
2017
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007715 2023-05-15T14:59:48+02:00 Low pCO2 under sea-ice melt in the Canada Basin of the western Arctic Ocean Kosugi, Naohiro Sasano, Daisuke Ishii, Masao Nishino, Shigeto Uchida, Hiroshi Yoshikawa-Inoue, Hisayuki 2017-12 electronic https://doi.org/10.5194/bg-14-5727-2017 https://noa.gwlb.de/receive/cop_mods_00007715 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007672/bg-14-5727-2017.pdf https://bg.copernicus.org/articles/14/5727/2017/bg-14-5727-2017.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-14-5727-2017 https://noa.gwlb.de/receive/cop_mods_00007715 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007672/bg-14-5727-2017.pdf https://bg.copernicus.org/articles/14/5727/2017/bg-14-5727-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/bg-14-5727-2017 2022-02-08T22:58:22Z In September 2013, we observed an expanse of surface water with low CO2 partial pressure (pCO2sea) (< 200 µatm) in the Chukchi Sea of the western Arctic Ocean. The large undersaturation of CO2 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 pCO2sea was closer to the air–sea CO2 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 pCO2sea 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 pCO2sea (< 250 µatm) in the depth of 30–50 m under the halocline of the Canada Basin. This subsurface low pCO2sea 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 pCO2sea layer in the Canada Basin indicated significant net primary production undersea and/or in preformed condition. If these low pCO2sea layers surface by wind mixing, they will act as additional CO2 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 Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Canada Chukchi Sea Pacific Biogeosciences 14 24 5727 5739 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Kosugi, Naohiro Sasano, Daisuke Ishii, Masao Nishino, Shigeto Uchida, Hiroshi Yoshikawa-Inoue, Hisayuki Low pCO2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
topic_facet |
article Verlagsveröffentlichung |
description |
In September 2013, we observed an expanse of surface water with low CO2 partial pressure (pCO2sea) (< 200 µatm) in the Chukchi Sea of the western Arctic Ocean. The large undersaturation of CO2 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 pCO2sea was closer to the air–sea CO2 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 pCO2sea 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 pCO2sea (< 250 µatm) in the depth of 30–50 m under the halocline of the Canada Basin. This subsurface low pCO2sea 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 pCO2sea layer in the Canada Basin indicated significant net primary production undersea and/or in preformed condition. If these low pCO2sea layers surface by wind mixing, they will act as additional CO2 sinks; however, this is unlikely because intensification of stratification by sea-ice melt inhibits mixing across the halocline. |
format |
Article in Journal/Newspaper |
author |
Kosugi, Naohiro Sasano, Daisuke Ishii, Masao Nishino, Shigeto Uchida, Hiroshi Yoshikawa-Inoue, Hisayuki |
author_facet |
Kosugi, Naohiro Sasano, Daisuke Ishii, Masao Nishino, Shigeto Uchida, Hiroshi Yoshikawa-Inoue, Hisayuki |
author_sort |
Kosugi, Naohiro |
title |
Low pCO2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_short |
Low pCO2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_full |
Low pCO2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_fullStr |
Low pCO2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_full_unstemmed |
Low pCO2 under sea-ice melt in the Canada Basin of the western Arctic Ocean |
title_sort |
low pco2 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://noa.gwlb.de/receive/cop_mods_00007715 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007672/bg-14-5727-2017.pdf https://bg.copernicus.org/articles/14/5727/2017/bg-14-5727-2017.pdf |
geographic |
Arctic Arctic Ocean Canada Chukchi Sea Pacific |
geographic_facet |
Arctic Arctic Ocean Canada Chukchi Sea 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_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-14-5727-2017 https://noa.gwlb.de/receive/cop_mods_00007715 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007672/bg-14-5727-2017.pdf https://bg.copernicus.org/articles/14/5727/2017/bg-14-5727-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-14-5727-2017 |
container_title |
Biogeosciences |
container_volume |
14 |
container_issue |
24 |
container_start_page |
5727 |
op_container_end_page |
5739 |
_version_ |
1766331925970026496 |