Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions
Seawater absorption of anthropogenic atmospheric carbon dioxide (CO2) has led to a range of changes in carbonate chemistry, collectively referred to as ocean acidification. Stoichiometric dissociation constants used to convert measured carbonate system variables (pH, pCO2, dissolved inorganic carbon...
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2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00052203 2023-05-15T15:52:48+02:00 Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions Sulpis, Olivier Lauvset, Siv K. Hagens, Mathilde 2020-07 electronic https://doi.org/10.5194/os-16-847-2020 https://noa.gwlb.de/receive/cop_mods_00052203 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051856/os-16-847-2020.pdf https://os.copernicus.org/articles/16/847/2020/os-16-847-2020.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-847-2020 https://noa.gwlb.de/receive/cop_mods_00052203 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051856/os-16-847-2020.pdf https://os.copernicus.org/articles/16/847/2020/os-16-847-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/os-16-847-2020 2022-02-08T22:36:05Z Seawater absorption of anthropogenic atmospheric carbon dioxide (CO2) has led to a range of changes in carbonate chemistry, collectively referred to as ocean acidification. Stoichiometric dissociation constants used to convert measured carbonate system variables (pH, pCO2, dissolved inorganic carbon, total alkalinity) into globally comparable parameters are crucial for accurately quantifying these changes. The temperature and salinity coefficients of these constants have generally been experimentally derived under controlled laboratory conditions. Here, we use field measurements of carbonate system variables taken from the Global Ocean Data Analysis Project version 2 and the Surface Ocean CO2 Atlas data products to evaluate the temperature dependence of the carbonic acid stoichiometric dissociation constants. By applying a novel iterative procedure to a large dataset of 948 surface-water, quality-controlled samples where four carbonate system variables were independently measured, we show that the set of equations published by Lueker et al. (2000), currently preferred by the ocean acidification community, overestimates the stoichiometric dissociation constants at temperatures below about 8 ∘C. We apply these newly derived temperature coefficients to high-latitude Argo float and cruise data to quantify the effects on surface-water pCO2 and calcite saturation states. These findings highlight the critical implications of uncertainty in stoichiometric dissociation constants for future projections of ocean acidification in polar regions and the need to improve knowledge of what causes the CO2 system inconsistencies in cold waters. Article in Journal/Newspaper Carbonic acid Ocean acidification Niedersächsisches Online-Archiv NOA Ocean Science 16 4 847 862 |
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article Verlagsveröffentlichung Sulpis, Olivier Lauvset, Siv K. Hagens, Mathilde Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions |
topic_facet |
article Verlagsveröffentlichung |
description |
Seawater absorption of anthropogenic atmospheric carbon dioxide (CO2) has led to a range of changes in carbonate chemistry, collectively referred to as ocean acidification. Stoichiometric dissociation constants used to convert measured carbonate system variables (pH, pCO2, dissolved inorganic carbon, total alkalinity) into globally comparable parameters are crucial for accurately quantifying these changes. The temperature and salinity coefficients of these constants have generally been experimentally derived under controlled laboratory conditions. Here, we use field measurements of carbonate system variables taken from the Global Ocean Data Analysis Project version 2 and the Surface Ocean CO2 Atlas data products to evaluate the temperature dependence of the carbonic acid stoichiometric dissociation constants. By applying a novel iterative procedure to a large dataset of 948 surface-water, quality-controlled samples where four carbonate system variables were independently measured, we show that the set of equations published by Lueker et al. (2000), currently preferred by the ocean acidification community, overestimates the stoichiometric dissociation constants at temperatures below about 8 ∘C. We apply these newly derived temperature coefficients to high-latitude Argo float and cruise data to quantify the effects on surface-water pCO2 and calcite saturation states. These findings highlight the critical implications of uncertainty in stoichiometric dissociation constants for future projections of ocean acidification in polar regions and the need to improve knowledge of what causes the CO2 system inconsistencies in cold waters. |
format |
Article in Journal/Newspaper |
author |
Sulpis, Olivier Lauvset, Siv K. Hagens, Mathilde |
author_facet |
Sulpis, Olivier Lauvset, Siv K. Hagens, Mathilde |
author_sort |
Sulpis, Olivier |
title |
Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions |
title_short |
Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions |
title_full |
Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions |
title_fullStr |
Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions |
title_full_unstemmed |
Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions |
title_sort |
current estimates of k1* and k2* appear inconsistent with measured co2 system parameters in cold oceanic regions |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/os-16-847-2020 https://noa.gwlb.de/receive/cop_mods_00052203 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051856/os-16-847-2020.pdf https://os.copernicus.org/articles/16/847/2020/os-16-847-2020.pdf |
genre |
Carbonic acid Ocean acidification |
genre_facet |
Carbonic acid Ocean acidification |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-847-2020 https://noa.gwlb.de/receive/cop_mods_00052203 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051856/os-16-847-2020.pdf https://os.copernicus.org/articles/16/847/2020/os-16-847-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/os-16-847-2020 |
container_title |
Ocean Science |
container_volume |
16 |
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4 |
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847 |
op_container_end_page |
862 |
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1766387893674180608 |