DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS
A number of workers have recently shown that the thermodynamic constants for the dissociation of carbonic acid in seawater of Mehrbach et al. are more reliable than measurements made on artificial seawater. These studies have largely been confined to looking at the internal consistency of measuremen...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Online Access: | https://oasis.postech.ac.kr/handle/2014.oak/28512 https://doi.org/10.1016/S0967-0637(02)00093-6 |
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ftponangunivst:oai:oasis.postech.ac.kr:2014.oak/28512 2023-05-15T15:52:41+02:00 DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS Millero, FJ Pierrot, D Lee, K Wanninkhof, R Feely, R Sabine, CL Key, RM Takahashi, T 환경공학부 10056383 Lee, K 2002-10 https://oasis.postech.ac.kr/handle/2014.oak/28512 https://doi.org/10.1016/S0967-0637(02)00093-6 English eng PERGAMON-ELSEVIER SCIENCE LTD DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 49 10 1705 1723 SCI급, SCOPUS 등재논문 SCI Oceanography 0967-0637 2003-OAK-0000017830 https://oasis.postech.ac.kr/handle/2014.oak/28512 doi:10.1016/S0967-0637(02)00093-6 3154 DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.49, no.10, pp.1705 - 1723 000179693300001 INORGANIC CARBON PH MEASUREMENTS BORIC-ACID SEAWATER WATER THERMODYNAMICS EQUILIBRIUM ALKALINITY SYSTEM CO2 SALINITIES FUGACITY Article ART 2002 ftponangunivst https://doi.org/10.1016/S0967-0637(02)00093-6 2022-10-20T20:18:33Z A number of workers have recently shown that the thermodynamic constants for the dissociation of carbonic acid in seawater of Mehrbach et al. are more reliable than measurements made on artificial seawater. These studies have largely been confined to looking at the internal consistency of measurements of total alkalinity (TA), total inorganic carbon dioxide (TCO2) and the fugacity of carbon dioxide (fCO(2)). In this paper, we have examined the field measurements of pH, JCO(2), TCO2 and TA on surface and deep waters from the Atlantic, Indian, Southern and Pacific oceans to determine the pK(1), pK(2) and pK(2) - pK(1). These calculations are possible due to the high precision and accuracy of the field measurements. The values of pK(2) and pK(2) - pK(1) over a wide range of temperatures (-1.6-38degreesC) are in good agreement (within +/-0.005) with the results of Mehrbach et al. The measured values of pK(1) at 4degreesC and 20degreesC are in reasonable agreement (within +/-0.01) with all the constants determined in laboratory studies. These results indicate, as suggested by internal consistency tests, that the directly measured values of pK(1)+pK(2) of Mehrbach et al. on real seawater are more reliable than the values determined for artificial seawater. It also indicates that the large differences of pK(2) - pK(1) (0.05 at 20degreesC in real and artificial seawater determined by different investigators are mainly due to differences in pK2. These differences may be related to the interactions of boric acid with the carbonate ion. The values of pK(2) - pK(1) determined from the laboratory measurements of Lee et al. and Lueker et al at low fCO(2) agree with the field-derived data to +/-0.016 from 5degreesC to 25degreesC. The values of pK(2) - pK(1) decrease as the fCO(2) or TCO2 increases. This effect is largely related to changes in the pK(2) as a function of fCO(2) or TCO2. The values of fCO(2) calculated from an input of TA and TCO2, which require reliable values of pK(2) - pK(1), also vary with fCO(2). The field ... Article in Journal/Newspaper Carbonic acid Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) Indian Pacific Deep Sea Research Part I: Oceanographic Research Papers 49 10 1705 1723 |
institution |
Open Polar |
collection |
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) |
op_collection_id |
ftponangunivst |
language |
English |
topic |
INORGANIC CARBON PH MEASUREMENTS BORIC-ACID SEAWATER WATER THERMODYNAMICS EQUILIBRIUM ALKALINITY SYSTEM CO2 SALINITIES FUGACITY |
spellingShingle |
INORGANIC CARBON PH MEASUREMENTS BORIC-ACID SEAWATER WATER THERMODYNAMICS EQUILIBRIUM ALKALINITY SYSTEM CO2 SALINITIES FUGACITY Millero, FJ Pierrot, D Lee, K Wanninkhof, R Feely, R Sabine, CL Key, RM Takahashi, T DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS |
topic_facet |
INORGANIC CARBON PH MEASUREMENTS BORIC-ACID SEAWATER WATER THERMODYNAMICS EQUILIBRIUM ALKALINITY SYSTEM CO2 SALINITIES FUGACITY |
description |
A number of workers have recently shown that the thermodynamic constants for the dissociation of carbonic acid in seawater of Mehrbach et al. are more reliable than measurements made on artificial seawater. These studies have largely been confined to looking at the internal consistency of measurements of total alkalinity (TA), total inorganic carbon dioxide (TCO2) and the fugacity of carbon dioxide (fCO(2)). In this paper, we have examined the field measurements of pH, JCO(2), TCO2 and TA on surface and deep waters from the Atlantic, Indian, Southern and Pacific oceans to determine the pK(1), pK(2) and pK(2) - pK(1). These calculations are possible due to the high precision and accuracy of the field measurements. The values of pK(2) and pK(2) - pK(1) over a wide range of temperatures (-1.6-38degreesC) are in good agreement (within +/-0.005) with the results of Mehrbach et al. The measured values of pK(1) at 4degreesC and 20degreesC are in reasonable agreement (within +/-0.01) with all the constants determined in laboratory studies. These results indicate, as suggested by internal consistency tests, that the directly measured values of pK(1)+pK(2) of Mehrbach et al. on real seawater are more reliable than the values determined for artificial seawater. It also indicates that the large differences of pK(2) - pK(1) (0.05 at 20degreesC in real and artificial seawater determined by different investigators are mainly due to differences in pK2. These differences may be related to the interactions of boric acid with the carbonate ion. The values of pK(2) - pK(1) determined from the laboratory measurements of Lee et al. and Lueker et al at low fCO(2) agree with the field-derived data to +/-0.016 from 5degreesC to 25degreesC. The values of pK(2) - pK(1) decrease as the fCO(2) or TCO2 increases. This effect is largely related to changes in the pK(2) as a function of fCO(2) or TCO2. The values of fCO(2) calculated from an input of TA and TCO2, which require reliable values of pK(2) - pK(1), also vary with fCO(2). The field ... |
author2 |
환경공학부 10056383 Lee, K |
format |
Article in Journal/Newspaper |
author |
Millero, FJ Pierrot, D Lee, K Wanninkhof, R Feely, R Sabine, CL Key, RM Takahashi, T |
author_facet |
Millero, FJ Pierrot, D Lee, K Wanninkhof, R Feely, R Sabine, CL Key, RM Takahashi, T |
author_sort |
Millero, FJ |
title |
DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS |
title_short |
DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS |
title_full |
DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS |
title_fullStr |
DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS |
title_full_unstemmed |
DISSOCIATION CONSTANTS FOR CARBONIC ACID DETERMINED FROM FIELD MEASUREMENTS |
title_sort |
dissociation constants for carbonic acid determined from field measurements |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2002 |
url |
https://oasis.postech.ac.kr/handle/2014.oak/28512 https://doi.org/10.1016/S0967-0637(02)00093-6 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 49 10 1705 1723 SCI급, SCOPUS 등재논문 SCI Oceanography 0967-0637 2003-OAK-0000017830 https://oasis.postech.ac.kr/handle/2014.oak/28512 doi:10.1016/S0967-0637(02)00093-6 3154 DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.49, no.10, pp.1705 - 1723 000179693300001 |
op_doi |
https://doi.org/10.1016/S0967-0637(02)00093-6 |
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Deep Sea Research Part I: Oceanographic Research Papers |
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49 |
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10 |
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