Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean
Rising atmospheric CO2 contents have led to greater CO2 uptake by the oceans, lowering both pH due to increasing hydrogen ions and CaCO3 saturation states due to declining carbonate ion (CO32−). Here we used previously compiled data sets and new data collected in 2010 and 2011 to investigate ocean a...
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2013
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00020971 2023-05-15T17:50:48+02:00 Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean Wakita, M. Watanabe, S. Honda, M. Nagano, A. Kimoto, K. Matsumoto, K. Kitamura, M. Sasaki, K. Kawakami, H. Fujiki, T. Sasaoka, K. Nakano, Y. Murata, A. 2013-12 electronic https://doi.org/10.5194/bg-10-7817-2013 https://noa.gwlb.de/receive/cop_mods_00020971 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020926/bg-10-7817-2013.pdf https://bg.copernicus.org/articles/10/7817/2013/bg-10-7817-2013.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-10-7817-2013 https://noa.gwlb.de/receive/cop_mods_00020971 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020926/bg-10-7817-2013.pdf https://bg.copernicus.org/articles/10/7817/2013/bg-10-7817-2013.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2013 ftnonlinearchiv https://doi.org/10.5194/bg-10-7817-2013 2022-02-08T22:51:54Z Rising atmospheric CO2 contents have led to greater CO2 uptake by the oceans, lowering both pH due to increasing hydrogen ions and CaCO3 saturation states due to declining carbonate ion (CO32−). Here we used previously compiled data sets and new data collected in 2010 and 2011 to investigate ocean acidification of the North Pacific western subarctic gyre. In winter, the western subarctic gyre is a source of CO2 to the atmosphere because of convective mixing of deep waters rich in dissolved inorganic carbon (DIC). We calculated pH in winter mixed layer from DIC and total alkalinity (TA), and found that it decreased at the rate of −0.0011 ± 0.0004 yr−1 from 1997 to 2011. This decrease rate is slower than that expected under the condition of seawater/atmosphere equilibration, and it is also slower than the rate in the subtropical regions (−0.002 yr−1). The slow rate is caused by a reduction of CO2 emission in winter due to an increase in TA. Below the mixed layer, the calcite saturation horizon (~ 185 m depth) shoaled at the rate of 2.9 ± 0.9 m yr−1 as the result of the declining CO32− concentration (−0.03 ± 0.01 μmol kg−1 yr−1). Between 200 m and 300 m depth, pH decline during the study period (−0.0051 ± 0.0010 yr−1) was larger than ever reported in the open North Pacific. This enhanced acidification rate below the calcite saturation horizon reflected not only the uptake of anthropogenic CO2 but also the increase in the decomposition of organic matter evaluated from the increase in AOU, which suggests that the dissolution of CaCO3 particles increased. Article in Journal/Newspaper Ocean acidification Subarctic Niedersächsisches Online-Archiv NOA Pacific Biogeosciences 10 12 7817 7827 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Wakita, M. Watanabe, S. Honda, M. Nagano, A. Kimoto, K. Matsumoto, K. Kitamura, M. Sasaki, K. Kawakami, H. Fujiki, T. Sasaoka, K. Nakano, Y. Murata, A. Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean |
topic_facet |
article Verlagsveröffentlichung |
description |
Rising atmospheric CO2 contents have led to greater CO2 uptake by the oceans, lowering both pH due to increasing hydrogen ions and CaCO3 saturation states due to declining carbonate ion (CO32−). Here we used previously compiled data sets and new data collected in 2010 and 2011 to investigate ocean acidification of the North Pacific western subarctic gyre. In winter, the western subarctic gyre is a source of CO2 to the atmosphere because of convective mixing of deep waters rich in dissolved inorganic carbon (DIC). We calculated pH in winter mixed layer from DIC and total alkalinity (TA), and found that it decreased at the rate of −0.0011 ± 0.0004 yr−1 from 1997 to 2011. This decrease rate is slower than that expected under the condition of seawater/atmosphere equilibration, and it is also slower than the rate in the subtropical regions (−0.002 yr−1). The slow rate is caused by a reduction of CO2 emission in winter due to an increase in TA. Below the mixed layer, the calcite saturation horizon (~ 185 m depth) shoaled at the rate of 2.9 ± 0.9 m yr−1 as the result of the declining CO32− concentration (−0.03 ± 0.01 μmol kg−1 yr−1). Between 200 m and 300 m depth, pH decline during the study period (−0.0051 ± 0.0010 yr−1) was larger than ever reported in the open North Pacific. This enhanced acidification rate below the calcite saturation horizon reflected not only the uptake of anthropogenic CO2 but also the increase in the decomposition of organic matter evaluated from the increase in AOU, which suggests that the dissolution of CaCO3 particles increased. |
format |
Article in Journal/Newspaper |
author |
Wakita, M. Watanabe, S. Honda, M. Nagano, A. Kimoto, K. Matsumoto, K. Kitamura, M. Sasaki, K. Kawakami, H. Fujiki, T. Sasaoka, K. Nakano, Y. Murata, A. |
author_facet |
Wakita, M. Watanabe, S. Honda, M. Nagano, A. Kimoto, K. Matsumoto, K. Kitamura, M. Sasaki, K. Kawakami, H. Fujiki, T. Sasaoka, K. Nakano, Y. Murata, A. |
author_sort |
Wakita, M. |
title |
Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean |
title_short |
Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean |
title_full |
Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean |
title_fullStr |
Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean |
title_full_unstemmed |
Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean |
title_sort |
ocean acidification from 1997 to 2011 in the subarctic western north pacific ocean |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-7817-2013 https://noa.gwlb.de/receive/cop_mods_00020971 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020926/bg-10-7817-2013.pdf https://bg.copernicus.org/articles/10/7817/2013/bg-10-7817-2013.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification Subarctic |
genre_facet |
Ocean acidification Subarctic |
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-10-7817-2013 https://noa.gwlb.de/receive/cop_mods_00020971 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020926/bg-10-7817-2013.pdf https://bg.copernicus.org/articles/10/7817/2013/bg-10-7817-2013.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-10-7817-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
12 |
container_start_page |
7817 |
op_container_end_page |
7827 |
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1766157694601789440 |