Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean
The Arctic Ocean is particularly vulnerable to ocean acidification, a process that is mainly driven by the uptake of anthropogenic carbon (C ant ) from the atmosphere. Although C ant concentrations cannot be measured directly in the ocean, they have been estimated using data-based methods such as th...
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ftvliz:oai:oma.vliz.be:337829 2023-05-15T14:41:25+02:00 Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean Terhaar, J. Tanhua, T. Stöven, T. Orr, J.C. Bopp, L. 2020 application/pdf https://www.vliz.be/imisdocs/publications/361619.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000549832900011 https://www.vliz.be/imisdocs/publications/361619.pdf info:eu-repo/semantics/openAccess %3Ci%3EJGR%3A+Oceans+125%286%29%3C%2Fi%3E%3A+e2020JC016124.+%3Ca+href%3D%22https%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JC016124%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JC016124%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftvliz 2022-05-01T11:55:23Z The Arctic Ocean is particularly vulnerable to ocean acidification, a process that is mainly driven by the uptake of anthropogenic carbon (C ant ) from the atmosphere. Although C ant concentrations cannot be measured directly in the ocean, they have been estimated using data-based methods such as the transient time distribution (TTD) approach, which characterizes the ventilation of water masses with inert transient tracers, such as CFC-12. Here, we evaluate the TTD approach in the Arctic Ocean using an eddying ocean model as a test bed. When the TTD approach is applied to simulated CFC-12 in that model, it underestimates the same model's directly simulated C ant concentrations by up to 12%, a bias that stems from its idealized assumption of gas equilibrium between atmosphere and surface water, both for CFC-12 and anthropogenic CO 2 . Unlike the idealized assumption, the simulated partial pressure of CFC-12 ( p CFC-12) in Arctic surface waters is undersaturated relative to that in the atmosphere in regions and times of deep-water formation, while the simulated equivalent for C ant is supersaturated. After accounting for the TTD approach's negative bias, the total amount of C ant in the Arctic Ocean in 2005 increases by 8% to 3.3 ± 0.3PgC. By combining the adjusted TTD approach with scenarios of future atmospheric CO 2 , it is estimated that all Arctic waters, from surface to depth, would become corrosive to aragonite by the middle of the next century even if atmospheric CO 2 could be stabilized at 540 ppm. Article in Journal/Newspaper Arctic Arctic Ocean Ocean acidification Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Arctic Arctic Ocean |
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Open Polar |
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Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
The Arctic Ocean is particularly vulnerable to ocean acidification, a process that is mainly driven by the uptake of anthropogenic carbon (C ant ) from the atmosphere. Although C ant concentrations cannot be measured directly in the ocean, they have been estimated using data-based methods such as the transient time distribution (TTD) approach, which characterizes the ventilation of water masses with inert transient tracers, such as CFC-12. Here, we evaluate the TTD approach in the Arctic Ocean using an eddying ocean model as a test bed. When the TTD approach is applied to simulated CFC-12 in that model, it underestimates the same model's directly simulated C ant concentrations by up to 12%, a bias that stems from its idealized assumption of gas equilibrium between atmosphere and surface water, both for CFC-12 and anthropogenic CO 2 . Unlike the idealized assumption, the simulated partial pressure of CFC-12 ( p CFC-12) in Arctic surface waters is undersaturated relative to that in the atmosphere in regions and times of deep-water formation, while the simulated equivalent for C ant is supersaturated. After accounting for the TTD approach's negative bias, the total amount of C ant in the Arctic Ocean in 2005 increases by 8% to 3.3 ± 0.3PgC. By combining the adjusted TTD approach with scenarios of future atmospheric CO 2 , it is estimated that all Arctic waters, from surface to depth, would become corrosive to aragonite by the middle of the next century even if atmospheric CO 2 could be stabilized at 540 ppm. |
format |
Article in Journal/Newspaper |
author |
Terhaar, J. Tanhua, T. Stöven, T. Orr, J.C. Bopp, L. |
spellingShingle |
Terhaar, J. Tanhua, T. Stöven, T. Orr, J.C. Bopp, L. Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean |
author_facet |
Terhaar, J. Tanhua, T. Stöven, T. Orr, J.C. Bopp, L. |
author_sort |
Terhaar, J. |
title |
Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean |
title_short |
Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean |
title_full |
Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean |
title_fullStr |
Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean |
title_full_unstemmed |
Evaluation of data-based estimates of anthropogenic carbon in the Arctic Ocean |
title_sort |
evaluation of data-based estimates of anthropogenic carbon in the arctic ocean |
publishDate |
2020 |
url |
https://www.vliz.be/imisdocs/publications/361619.pdf |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ocean acidification |
genre_facet |
Arctic Arctic Ocean Ocean acidification |
op_source |
%3Ci%3EJGR%3A+Oceans+125%286%29%3C%2Fi%3E%3A+e2020JC016124.+%3Ca+href%3D%22https%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JC016124%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fhdl.handle.net%2F10.1029%2F2020JC016124%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000549832900011 https://www.vliz.be/imisdocs/publications/361619.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766313199677734912 |