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...
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2012
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ftsouthampton:oai:eprints.soton.ac.uk:343410 2023-07-30T04:06:06+02:00 Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study Loucaides, Socratis Tyrrell, Toby Achterberg, Eric P. Torres, Ricardo Nightingale, Philip D. Kitidis, Vassilis Serret, Pablo Woodward, Malcolm Robinson, Carol 2012 https://eprints.soton.ac.uk/343410/ unknown Loucaides, Socratis, Tyrrell, Toby, Achterberg, Eric P., Torres, Ricardo, Nightingale, Philip D., Kitidis, Vassilis, Serret, Pablo, Woodward, Malcolm and Robinson, Carol (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), GB3008. (doi:10.1029/2011GB004216 <http://dx.doi.org/10.1029/2011GB004216>). Article PeerReviewed 2012 ftsouthampton https://doi.org/10.1029/2011GB004216 2023-07-09T21:41:33Z 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 pHtot 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 9 days, biological uptake of DIC (37 ?mol kg?1) reduced pCO2 concentrations from 540 to 410 ?atm, thereby increasing pHtot to 8.05 and calcite and aragonite saturation states to 4.0 and 2.7 respectively. The increase (25 ?mol kg?1) in total alkalinity over the 9 day 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 CaCO3 saturation of upwelled waters, amplifying any adverse consequences of ocean acidification on the ecosystem of the Mauritanian upwelling system. Article in Journal/Newspaper Ocean acidification University of Southampton: e-Prints Soton Global Biogeochemical Cycles 26 3 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
unknown |
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 pHtot 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 9 days, biological uptake of DIC (37 ?mol kg?1) reduced pCO2 concentrations from 540 to 410 ?atm, thereby increasing pHtot to 8.05 and calcite and aragonite saturation states to 4.0 and 2.7 respectively. The increase (25 ?mol kg?1) in total alkalinity over the 9 day 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 CaCO3 saturation of upwelled waters, amplifying any adverse consequences of ocean acidification on the ecosystem of the Mauritanian upwelling system. |
format |
Article in Journal/Newspaper |
author |
Loucaides, Socratis Tyrrell, Toby Achterberg, Eric P. Torres, Ricardo Nightingale, Philip D. Kitidis, Vassilis Serret, Pablo Woodward, Malcolm Robinson, Carol |
spellingShingle |
Loucaides, Socratis Tyrrell, Toby Achterberg, Eric P. Torres, Ricardo Nightingale, Philip D. Kitidis, Vassilis Serret, Pablo Woodward, Malcolm Robinson, Carol Biological and physical forcing of carbonate chemistry in an upwelling filament off northwest Africa: Results from a Lagrangian study |
author_facet |
Loucaides, Socratis Tyrrell, Toby Achterberg, Eric P. Torres, Ricardo Nightingale, Philip D. Kitidis, Vassilis Serret, Pablo Woodward, Malcolm Robinson, Carol |
author_sort |
Loucaides, Socratis |
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 |
publishDate |
2012 |
url |
https://eprints.soton.ac.uk/343410/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Loucaides, Socratis, Tyrrell, Toby, Achterberg, Eric P., Torres, Ricardo, Nightingale, Philip D., Kitidis, Vassilis, Serret, Pablo, Woodward, Malcolm and Robinson, Carol (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), GB3008. (doi:10.1029/2011GB004216 <http://dx.doi.org/10.1029/2011GB004216>). |
op_doi |
https://doi.org/10.1029/2011GB004216 |
container_title |
Global Biogeochemical Cycles |
container_volume |
26 |
container_issue |
3 |
_version_ |
1772818502845988864 |