Global ocean spectrophotometric pH assessment: consistent inconsistencies
Ocean acidification (OA)—or the decrease in seawater pH resulting from ocean uptake of CO2 released by human activities—stresses ocean ecosystems and is recognized as a Climate and Sustainable Development Goal Indicator that needs to be evaluated and monitored. Monitoring OA-related pH changes requi...
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Online Access: | http://hdl.handle.net/10508/14714 https://doi.org/10.1021/acs.est.9b06932 |
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ftieo:oai:repositorio.ieo.es:10508/14714 2023-06-11T04:15:41+02:00 Global ocean spectrophotometric pH assessment: consistent inconsistencies Álvarez, M. (Marta) Fajar, N. (Noelia) Carter, Br. Guallart, E.F. (Elisa) Pérez, F.F. (Fiz F.) Woosley, Rj. Murata, A. 2020 http://hdl.handle.net/10508/14714 https://doi.org/10.1021/acs.est.9b06932 eng eng Centro Oceanográfico de A Coruña http://hdl.handle.net/10508/14714 doi:10.1021/acs.est.9b06932 closed access research article 2020 ftieo https://doi.org/10.1021/acs.est.9b06932 2023-05-02T23:49:27Z Ocean acidification (OA)—or the decrease in seawater pH resulting from ocean uptake of CO2 released by human activities—stresses ocean ecosystems and is recognized as a Climate and Sustainable Development Goal Indicator that needs to be evaluated and monitored. Monitoring OA-related pH changes requires a high level of precision and accuracy. The two most common ways to quantify seawater pH are to measure it spectrophotometrically or to calculate it from total alkalinity (TA) and dissolved inorganic carbon (DIC). However, despite decades of research, small but important inconsistencies remain between measured and calculated pH. To date, this issue has been circumvented by examining changes only in consistently measured properties. Currently, the oceanographic community is defining new observational strategies for OA and other key aspects of the ocean carbon cycle based on novel sensors and technologies that rely on validation against data records and/or synthesis products. Comparison of measured spectrophotometric pH to calculated pH from TA and DIC measured during the 2000s and 2010s eras reveals that (1) there is an evolution toward a better agreement between measured and calculated pH over time from 0.02 pH units in the 2000s to 0.01 pH units in the 2010s at pH > 7.6; (2) a disagreement greater than 0.01 pH units persists in waters with pH < 7.6, and (3) inconsistencies likely stem from variations in the spectrophotometric pH standard operating procedure (SOP). A reassessment of pH measurement and calculation SOPs and metrology is urgently needed Article in Journal/Newspaper Ocean acidification Instituto Español de Oceanografía: e-IEO Environmental Science & Technology 54 18 10977 10988 |
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Open Polar |
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Instituto Español de Oceanografía: e-IEO |
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English |
description |
Ocean acidification (OA)—or the decrease in seawater pH resulting from ocean uptake of CO2 released by human activities—stresses ocean ecosystems and is recognized as a Climate and Sustainable Development Goal Indicator that needs to be evaluated and monitored. Monitoring OA-related pH changes requires a high level of precision and accuracy. The two most common ways to quantify seawater pH are to measure it spectrophotometrically or to calculate it from total alkalinity (TA) and dissolved inorganic carbon (DIC). However, despite decades of research, small but important inconsistencies remain between measured and calculated pH. To date, this issue has been circumvented by examining changes only in consistently measured properties. Currently, the oceanographic community is defining new observational strategies for OA and other key aspects of the ocean carbon cycle based on novel sensors and technologies that rely on validation against data records and/or synthesis products. Comparison of measured spectrophotometric pH to calculated pH from TA and DIC measured during the 2000s and 2010s eras reveals that (1) there is an evolution toward a better agreement between measured and calculated pH over time from 0.02 pH units in the 2000s to 0.01 pH units in the 2010s at pH > 7.6; (2) a disagreement greater than 0.01 pH units persists in waters with pH < 7.6, and (3) inconsistencies likely stem from variations in the spectrophotometric pH standard operating procedure (SOP). A reassessment of pH measurement and calculation SOPs and metrology is urgently needed |
format |
Article in Journal/Newspaper |
author |
Álvarez, M. (Marta) Fajar, N. (Noelia) Carter, Br. Guallart, E.F. (Elisa) Pérez, F.F. (Fiz F.) Woosley, Rj. Murata, A. |
spellingShingle |
Álvarez, M. (Marta) Fajar, N. (Noelia) Carter, Br. Guallart, E.F. (Elisa) Pérez, F.F. (Fiz F.) Woosley, Rj. Murata, A. Global ocean spectrophotometric pH assessment: consistent inconsistencies |
author_facet |
Álvarez, M. (Marta) Fajar, N. (Noelia) Carter, Br. Guallart, E.F. (Elisa) Pérez, F.F. (Fiz F.) Woosley, Rj. Murata, A. |
author_sort |
Álvarez, M. (Marta) |
title |
Global ocean spectrophotometric pH assessment: consistent inconsistencies |
title_short |
Global ocean spectrophotometric pH assessment: consistent inconsistencies |
title_full |
Global ocean spectrophotometric pH assessment: consistent inconsistencies |
title_fullStr |
Global ocean spectrophotometric pH assessment: consistent inconsistencies |
title_full_unstemmed |
Global ocean spectrophotometric pH assessment: consistent inconsistencies |
title_sort |
global ocean spectrophotometric ph assessment: consistent inconsistencies |
publisher |
Centro Oceanográfico de A Coruña |
publishDate |
2020 |
url |
http://hdl.handle.net/10508/14714 https://doi.org/10.1021/acs.est.9b06932 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://hdl.handle.net/10508/14714 doi:10.1021/acs.est.9b06932 |
op_rights |
closed access |
op_doi |
https://doi.org/10.1021/acs.est.9b06932 |
container_title |
Environmental Science & Technology |
container_volume |
54 |
container_issue |
18 |
container_start_page |
10977 |
op_container_end_page |
10988 |
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1768372698332790784 |