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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ftunivutrecht:oai:dspace.library.uu.nl:1874/409088 2023-12-03T10:21:01+01:00 Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions Sulpis, O.J.T. Lauvset, Siv K. Hagens, M. Geochemistry General geochemistry 2020-07-21 application/pdf https://dspace.library.uu.nl/handle/1874/409088 en eng 1812-0784 https://dspace.library.uu.nl/handle/1874/409088 info:eu-repo/semantics/OpenAccess Article 2020 ftunivutrecht 2023-11-08T23:19:23Z 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 Utrecht University Repository |
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Open Polar |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
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. |
author2 |
Geochemistry General geochemistry |
format |
Article in Journal/Newspaper |
author |
Sulpis, O.J.T. Lauvset, Siv K. Hagens, M. |
spellingShingle |
Sulpis, O.J.T. Lauvset, Siv K. Hagens, M. Current estimates of K1* and K2* appear inconsistent with measured CO2 system parameters in cold oceanic regions |
author_facet |
Sulpis, O.J.T. Lauvset, Siv K. Hagens, M. |
author_sort |
Sulpis, O.J.T. |
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 |
publishDate |
2020 |
url |
https://dspace.library.uu.nl/handle/1874/409088 |
genre |
Carbonic acid Ocean acidification |
genre_facet |
Carbonic acid Ocean acidification |
op_relation |
1812-0784 https://dspace.library.uu.nl/handle/1874/409088 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784268575806062592 |