Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis
More than 74 biogeochemical profiling floats that measure water column pH, oxygen, nitrate, fluorescence, and backscattering at 10 day intervals have been deployed throughout the Southern Ocean. Calculating the surface ocean partial pressure of carbon dioxide (pCO2sw) from float pH has uncertainty c...
Published in: | Global Biogeochemical Cycles |
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ftarchimer:oai:archimer.ifremer.fr:49462 2023-05-15T13:50:50+02:00 Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis Williams, N. L. Juranek, L. W. Feely, R. A. Johnson, K. S. Sarmiento, J. L. Talley, L. D. Dickson, A. G. Gray, A. R. Wanninkhof, R. Russell, J. L. Riser, S. C. Takeshita, Y. 2017-03 application/pdf https://archimer.ifremer.fr/doc/00383/49462/49946.pdf https://archimer.ifremer.fr/doc/00383/49462/49947.pdf https://doi.org/10.1002/2016GB005541 https://archimer.ifremer.fr/doc/00383/49462/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00383/49462/49946.pdf https://archimer.ifremer.fr/doc/00383/49462/49947.pdf doi:10.1002/2016GB005541 https://archimer.ifremer.fr/doc/00383/49462/ 2017. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2017-03 , Vol. 31 , N. 3 , P. 591-604 text Publication info:eu-repo/semantics/article 2017 ftarchimer https://doi.org/10.1002/2016GB005541 2021-09-23T20:29:28Z More than 74 biogeochemical profiling floats that measure water column pH, oxygen, nitrate, fluorescence, and backscattering at 10 day intervals have been deployed throughout the Southern Ocean. Calculating the surface ocean partial pressure of carbon dioxide (pCO2sw) from float pH has uncertainty contributions from the pH sensor, the alkalinity estimate, and carbonate system equilibrium constants, resulting in a relative standard uncertainty in pCO2sw of 2.7% (or 11 µatm at pCO2sw of 400 µatm). The calculated pCO2sw from several floats spanning a range of oceanographic regimes are compared to existing climatologies. In some locations, such as the subantarctic zone, the float data closely match the climatologies, but in the polar Antarctic zone significantly higher pCO2sw are calculated in the wintertime implying a greater air-sea CO2 efflux estimate. Our results based on four representative floats suggest that despite their uncertainty relative to direct measurements, the float data can be used to improve estimates for air-sea carbon flux, as well as to increase knowledge of spatial, seasonal, and interannual variability in this flux. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Southern Ocean Global Biogeochemical Cycles 31 3 591 604 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
More than 74 biogeochemical profiling floats that measure water column pH, oxygen, nitrate, fluorescence, and backscattering at 10 day intervals have been deployed throughout the Southern Ocean. Calculating the surface ocean partial pressure of carbon dioxide (pCO2sw) from float pH has uncertainty contributions from the pH sensor, the alkalinity estimate, and carbonate system equilibrium constants, resulting in a relative standard uncertainty in pCO2sw of 2.7% (or 11 µatm at pCO2sw of 400 µatm). The calculated pCO2sw from several floats spanning a range of oceanographic regimes are compared to existing climatologies. In some locations, such as the subantarctic zone, the float data closely match the climatologies, but in the polar Antarctic zone significantly higher pCO2sw are calculated in the wintertime implying a greater air-sea CO2 efflux estimate. Our results based on four representative floats suggest that despite their uncertainty relative to direct measurements, the float data can be used to improve estimates for air-sea carbon flux, as well as to increase knowledge of spatial, seasonal, and interannual variability in this flux. |
format |
Article in Journal/Newspaper |
author |
Williams, N. L. Juranek, L. W. Feely, R. A. Johnson, K. S. Sarmiento, J. L. Talley, L. D. Dickson, A. G. Gray, A. R. Wanninkhof, R. Russell, J. L. Riser, S. C. Takeshita, Y. |
spellingShingle |
Williams, N. L. Juranek, L. W. Feely, R. A. Johnson, K. S. Sarmiento, J. L. Talley, L. D. Dickson, A. G. Gray, A. R. Wanninkhof, R. Russell, J. L. Riser, S. C. Takeshita, Y. Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis |
author_facet |
Williams, N. L. Juranek, L. W. Feely, R. A. Johnson, K. S. Sarmiento, J. L. Talley, L. D. Dickson, A. G. Gray, A. R. Wanninkhof, R. Russell, J. L. Riser, S. C. Takeshita, Y. |
author_sort |
Williams, N. L. |
title |
Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis |
title_short |
Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis |
title_full |
Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis |
title_fullStr |
Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis |
title_full_unstemmed |
Calculating surface ocean pCO 2 from biogeochemical Argo floats equipped with pH: An uncertainty analysis |
title_sort |
calculating surface ocean pco 2 from biogeochemical argo floats equipped with ph: an uncertainty analysis |
publisher |
Amer Geophysical Union |
publishDate |
2017 |
url |
https://archimer.ifremer.fr/doc/00383/49462/49946.pdf https://archimer.ifremer.fr/doc/00383/49462/49947.pdf https://doi.org/10.1002/2016GB005541 https://archimer.ifremer.fr/doc/00383/49462/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2017-03 , Vol. 31 , N. 3 , P. 591-604 |
op_relation |
https://archimer.ifremer.fr/doc/00383/49462/49946.pdf https://archimer.ifremer.fr/doc/00383/49462/49947.pdf doi:10.1002/2016GB005541 https://archimer.ifremer.fr/doc/00383/49462/ |
op_rights |
2017. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2016GB005541 |
container_title |
Global Biogeochemical Cycles |
container_volume |
31 |
container_issue |
3 |
container_start_page |
591 |
op_container_end_page |
604 |
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1766254159741321216 |