Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment
Rising concentrations of atmospheric carbon dioxide are causing ocean acidification and will influence marine processes and trace metal biogeochemistry. The importance of the combined impacts of elevated CO 2 and changes in trace metal availability on marine plankton remain largely unknown. A mesoco...
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ftcopernicus:oai:publications.copernicus.org:bgd72240 2023-05-15T17:50:06+02:00 Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment Lorenzo, M. Rosario Segovia, María Cullen, Jay T. Maldonado, María T. 2018-11-19 application/pdf https://doi.org/10.5194/bg-2018-448 https://www.biogeosciences-discuss.net/bg-2018-448/ eng eng doi:10.5194/bg-2018-448 https://www.biogeosciences-discuss.net/bg-2018-448/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-2018-448 2019-12-24T09:49:42Z Rising concentrations of atmospheric carbon dioxide are causing ocean acidification and will influence marine processes and trace metal biogeochemistry. The importance of the combined impacts of elevated CO 2 and changes in trace metal availability on marine plankton remain largely unknown. A mesocosm experiment was performed to study changes in particulate trace metal concentrations during a bloom dominated by the coccolithophore Emiliania huxleyi . We employed a full-factorial experimental design, comprising all combinations of ambient and elevated p CO 2 and dissolved iron (dFe). Particulate metal concentrations (Fe, Cu, Zn, Co, Mn, Cd, Mo, Ti and Pb) were determined by high-resolution inductively coupled plasma mass spectrometry (HR-ICPMS). We examined biogenic and lithogenic sources of particulate metals, and their evolution during the experiment. Biogenic metal concentrations were estimated from bulk particle measurements by comparing phosphorus (P)-normalised quotas with published ratios, as well as concentrations of particulate trace metals in the presence and absence of an oxalate-EDTA wash. Our results demonstrate that particulate Ti and Fe concentrations were dominated by lithogenic material in the fjord. In contrast, particulate Cu, Co, Mn, Zn, Mo and Cd concentrations correlated with P concentrations and phytoplankton biomass, indicative of their strong biogenic character. Furthermore, ocean acidification changed the relative concentrations of particulate metals; a result mainly driven by the effects of ocean acidification on the growth of different phytoplankton phyla. This study demonstrates the utility and robustness of combining trace metal analyses of particles in a controlled mesocosm experiment with manipulations of CO 2 and Fe concentrations using natural assemblages of marine phytoplankton. Text Ocean acidification Copernicus Publications: E-Journals |
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English |
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Rising concentrations of atmospheric carbon dioxide are causing ocean acidification and will influence marine processes and trace metal biogeochemistry. The importance of the combined impacts of elevated CO 2 and changes in trace metal availability on marine plankton remain largely unknown. A mesocosm experiment was performed to study changes in particulate trace metal concentrations during a bloom dominated by the coccolithophore Emiliania huxleyi . We employed a full-factorial experimental design, comprising all combinations of ambient and elevated p CO 2 and dissolved iron (dFe). Particulate metal concentrations (Fe, Cu, Zn, Co, Mn, Cd, Mo, Ti and Pb) were determined by high-resolution inductively coupled plasma mass spectrometry (HR-ICPMS). We examined biogenic and lithogenic sources of particulate metals, and their evolution during the experiment. Biogenic metal concentrations were estimated from bulk particle measurements by comparing phosphorus (P)-normalised quotas with published ratios, as well as concentrations of particulate trace metals in the presence and absence of an oxalate-EDTA wash. Our results demonstrate that particulate Ti and Fe concentrations were dominated by lithogenic material in the fjord. In contrast, particulate Cu, Co, Mn, Zn, Mo and Cd concentrations correlated with P concentrations and phytoplankton biomass, indicative of their strong biogenic character. Furthermore, ocean acidification changed the relative concentrations of particulate metals; a result mainly driven by the effects of ocean acidification on the growth of different phytoplankton phyla. This study demonstrates the utility and robustness of combining trace metal analyses of particles in a controlled mesocosm experiment with manipulations of CO 2 and Fe concentrations using natural assemblages of marine phytoplankton. |
format |
Text |
author |
Lorenzo, M. Rosario Segovia, María Cullen, Jay T. Maldonado, María T. |
spellingShingle |
Lorenzo, M. Rosario Segovia, María Cullen, Jay T. Maldonado, María T. Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment |
author_facet |
Lorenzo, M. Rosario Segovia, María Cullen, Jay T. Maldonado, María T. |
author_sort |
Lorenzo, M. Rosario |
title |
Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment |
title_short |
Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment |
title_full |
Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment |
title_fullStr |
Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment |
title_full_unstemmed |
Particulate trace metal dynamics in response to increased CO2 and iron availability in a coastal mesocosm experiment |
title_sort |
particulate trace metal dynamics in response to increased co2 and iron availability in a coastal mesocosm experiment |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-2018-448 https://www.biogeosciences-discuss.net/bg-2018-448/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2018-448 https://www.biogeosciences-discuss.net/bg-2018-448/ |
op_doi |
https://doi.org/10.5194/bg-2018-448 |
_version_ |
1766156698283671552 |