| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
When can ocean acidification impacts be detected from decadal alkalinity measurements?
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| Autores: |
Carter, B. R.
Frolicher, T. L.
Dunne, J. P.
Rodgers, K. B.
Slater, R. D.
Sarmiento, J. L.
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| Data: |
2016-04
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| Ano: |
2016
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| Palavras-chave: |
Alkalinity
Ocean acidification
Trend detection
Repeat hydrography
Carbon cycle
Carbonate system
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| Resumo: |
We use a large initial condition suite of simulations (30 runs) with an Earth system model to assess the detectability of biogeochemical impacts of ocean acidification (OA) on the marine alkalinity distribution from decadally repeated hydrographic measurements such as those produced by the Global Ship-Based Hydrographic Investigations Program (GO-SHIP). Detection of these impacts is complicated by alkalinity changes from variability and long-term trends in freshwater and organic matter cycling and ocean circulation. In our ensemble simulation, variability in freshwater cycling generates large changes in alkalinity that obscure the changes of interest and prevent the attribution of observed alkalinity redistribution to OA. These complications from freshwater cycling can be mostly avoided through salinity normalization of alkalinity. With the salinity-normalized alkalinity, modeled OA impacts are broadly detectable in the surface of the subtropical gyres by 2030. Discrepancies between this finding and the finding of an earlier analysis suggest that these estimates are strongly sensitive to the patterns of calcium carbonate export simulated by the model. OA impacts are detectable later in the subpolar and equatorial regions due to slower responses of alkalinity to OA in these regions and greater seasonal equatorial alkalinity variability. OA impacts are detectable later at depth despite lower variability due to smaller rates of change and consistent measurement uncertainty.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00383/49419/49860.pdf
https://archimer.ifremer.fr/doc/00383/49419/49861.pdf
DOI:10.1002/2015GB005308
https://archimer.ifremer.fr/doc/00383/49419/
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| Editor: |
Amer Geophysical Union
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| Formato: |
application/pdf
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| Fonte: |
Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2016-04 , Vol. 30 , N. 4 , P. 595-612
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| Direitos: |
2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
info:eu-repo/semantics/openAccess
restricted use
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