Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study
The Mauritanian upwelling system is one of the most biologically productive regions of the world's oceans. Coastal upwelling transfers nutrients to the sun-lit surface ocean, thereby stimulating phytoplankton growth. Upwelling of deep waters also supplies dissolved inorganic carbon (DIC), high...
Published in: | Global Biogeochemical Cycles |
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Online Access: | https://oceanrep.geomar.de/id/eprint/21742/ https://oceanrep.geomar.de/id/eprint/21742/1/gbc1906.pdf https://doi.org/10.1029/2011GB004216 |
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ftoceanrep:oai:oceanrep.geomar.de:21742 2023-05-15T17:51:45+02:00 Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study Loucaides, S. Tyrrell, T. Achterberg, Eric P. Torres, R. Nightingale, P. D. Kitidis, V. Serret, P. Woodward, M. Robinson, C.d 2012 text https://oceanrep.geomar.de/id/eprint/21742/ https://oceanrep.geomar.de/id/eprint/21742/1/gbc1906.pdf https://doi.org/10.1029/2011GB004216 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/21742/1/gbc1906.pdf Loucaides, S., Tyrrell, T., Achterberg, E. P. , Torres, R., Nightingale, P. D., Kitidis, V., Serret, P., Woodward, M. and Robinson, C. d. (2012) Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study. Global Biogeochemical Cycles, 26 (3). DOI 10.1029/2011GB004216 <https://doi.org/10.1029/2011GB004216>. doi:10.1029/2011GB004216 Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1029/2011GB004216 2023-04-07T15:09:49Z The Mauritanian upwelling system is one of the most biologically productive regions of the world's oceans. Coastal upwelling transfers nutrients to the sun-lit surface ocean, thereby stimulating phytoplankton growth. Upwelling of deep waters also supplies dissolved inorganic carbon (DIC), high levels of which lead to low calcium carbonate saturation states in surface waters, with potentially adverse effects on marine calcifiers. In this study an upwelled filament off the coast of northwest Africa was followed using drifting buoys and sulphur hexafluoride to determine how the carbonate chemistry changed over time as a result of biological, physical and chemical processes. The initial pH tot in the mixed layer of the upwelled plume was 7.94 and the saturation states of calcite and aragonite were 3.4 and 2.2, respectively. As the plume moved offshore over a period of 9days, biological uptake of DIC (37 μmolkg -1) reduced pCO 2 concentrations from 540 to 410 μatm, thereby increasing pH tot to 8.05 and calcite and aragonite saturation states to 4.0 and 2.7 respectively. The increase (25 μmolkg -1) in total alkalinity over the 9day study period can be accounted for solely by the combined effects of nitrate uptake and processes that alter salinity (i.e., evaporation and mixing with other water masses). We found no evidence of significant alkalinity accumulation as a result of exudation of organic bases by primary producers. The ongoing expansion of oxygen minimum zones through global warming will likely further reduce the CaCO 3 saturation of upwelled waters, amplifying any adverse consequences of ocean acidification on the ecosystem of the Mauritanian upwelling system. © 2012. American Geophysical Union. All Rights Reserved. Article in Journal/Newspaper Ocean acidification OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Global Biogeochemical Cycles 26 3 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
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English |
description |
The Mauritanian upwelling system is one of the most biologically productive regions of the world's oceans. Coastal upwelling transfers nutrients to the sun-lit surface ocean, thereby stimulating phytoplankton growth. Upwelling of deep waters also supplies dissolved inorganic carbon (DIC), high levels of which lead to low calcium carbonate saturation states in surface waters, with potentially adverse effects on marine calcifiers. In this study an upwelled filament off the coast of northwest Africa was followed using drifting buoys and sulphur hexafluoride to determine how the carbonate chemistry changed over time as a result of biological, physical and chemical processes. The initial pH tot in the mixed layer of the upwelled plume was 7.94 and the saturation states of calcite and aragonite were 3.4 and 2.2, respectively. As the plume moved offshore over a period of 9days, biological uptake of DIC (37 μmolkg -1) reduced pCO 2 concentrations from 540 to 410 μatm, thereby increasing pH tot to 8.05 and calcite and aragonite saturation states to 4.0 and 2.7 respectively. The increase (25 μmolkg -1) in total alkalinity over the 9day study period can be accounted for solely by the combined effects of nitrate uptake and processes that alter salinity (i.e., evaporation and mixing with other water masses). We found no evidence of significant alkalinity accumulation as a result of exudation of organic bases by primary producers. The ongoing expansion of oxygen minimum zones through global warming will likely further reduce the CaCO 3 saturation of upwelled waters, amplifying any adverse consequences of ocean acidification on the ecosystem of the Mauritanian upwelling system. © 2012. American Geophysical Union. All Rights Reserved. |
format |
Article in Journal/Newspaper |
author |
Loucaides, S. Tyrrell, T. Achterberg, Eric P. Torres, R. Nightingale, P. D. Kitidis, V. Serret, P. Woodward, M. Robinson, C.d |
spellingShingle |
Loucaides, S. Tyrrell, T. Achterberg, Eric P. Torres, R. Nightingale, P. D. Kitidis, V. Serret, P. Woodward, M. Robinson, C.d Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study |
author_facet |
Loucaides, S. Tyrrell, T. Achterberg, Eric P. Torres, R. Nightingale, P. D. Kitidis, V. Serret, P. Woodward, M. Robinson, C.d |
author_sort |
Loucaides, S. |
title |
Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study |
title_short |
Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study |
title_full |
Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study |
title_fullStr |
Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study |
title_full_unstemmed |
Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study |
title_sort |
biological and physical forcing of carbonate chemistry in an upwelling filament off northwest africa: results from a lagrangian study |
publisher |
AGU (American Geophysical Union) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/21742/ https://oceanrep.geomar.de/id/eprint/21742/1/gbc1906.pdf https://doi.org/10.1029/2011GB004216 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://oceanrep.geomar.de/id/eprint/21742/1/gbc1906.pdf Loucaides, S., Tyrrell, T., Achterberg, E. P. , Torres, R., Nightingale, P. D., Kitidis, V., Serret, P., Woodward, M. and Robinson, C. d. (2012) Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study. Global Biogeochemical Cycles, 26 (3). DOI 10.1029/2011GB004216 <https://doi.org/10.1029/2011GB004216>. doi:10.1029/2011GB004216 |
op_doi |
https://doi.org/10.1029/2011GB004216 |
container_title |
Global Biogeochemical Cycles |
container_volume |
26 |
container_issue |
3 |
_version_ |
1766158992141189120 |