A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment
The effect of ocean acidification on growth and calcification of the marine algae Emiliania huxleyi was investigated in a series of mesocosm experiments where enclosed water volumes that comprised a natural plankton community were exposed to different carbon dioxide (CO 2 ) concentrations. Calcifica...
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ftcopernicus:oai:publications.copernicus.org:bg54867 2023-05-15T17:49:37+02:00 A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment Krishna, Shubham Schartau, Markus 2018-09-27 application/pdf https://doi.org/10.5194/bg-14-1857-2017 https://www.biogeosciences.net/14/1857/2017/ eng eng doi:10.5194/bg-14-1857-2017 https://www.biogeosciences.net/14/1857/2017/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-14-1857-2017 2019-12-24T09:51:32Z The effect of ocean acidification on growth and calcification of the marine algae Emiliania huxleyi was investigated in a series of mesocosm experiments where enclosed water volumes that comprised a natural plankton community were exposed to different carbon dioxide (CO 2 ) concentrations. Calcification rates observed during those experiments were found to be highly variable, even among replicate mesocosms that were subject to similar CO 2 perturbations. Here, data from an ocean acidification mesocosm experiment are reanalysed with an optimality-based dynamical plankton model. According to our model approach, cellular calcite formation is sensitive to variations in CO 2 at the organism level. We investigate the temporal changes and variability in observations, with a focus on resolving observed differences in total alkalinity and particulate inorganic carbon (PIC). We explore how much of the variability in the data can be explained by variations of the initial conditions and by the level of CO 2 perturbation. Nine mesocosms of one experiment were sorted into three groups of high, medium, and low calcification rates and analysed separately. The spread of the three optimised ensemble model solutions captures most of the observed variability. Our results show that small variations in initial abundance of coccolithophores and the prevailing physiological acclimation states generate differences in calcification that are larger than those induced by ocean acidification. Accordingly, large deviations between optimal mass flux estimates of carbon and of nitrogen are identified even between mesocosms that were subject to similar ocean acidification conditions. With our model-based data analysis we document how an ocean acidification response signal in calcification can be disentangled from the observed variability in PIC. Text Ocean acidification Copernicus Publications: E-Journals Biogeosciences 14 7 1857 1882 |
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Open Polar |
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Copernicus Publications: E-Journals |
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English |
description |
The effect of ocean acidification on growth and calcification of the marine algae Emiliania huxleyi was investigated in a series of mesocosm experiments where enclosed water volumes that comprised a natural plankton community were exposed to different carbon dioxide (CO 2 ) concentrations. Calcification rates observed during those experiments were found to be highly variable, even among replicate mesocosms that were subject to similar CO 2 perturbations. Here, data from an ocean acidification mesocosm experiment are reanalysed with an optimality-based dynamical plankton model. According to our model approach, cellular calcite formation is sensitive to variations in CO 2 at the organism level. We investigate the temporal changes and variability in observations, with a focus on resolving observed differences in total alkalinity and particulate inorganic carbon (PIC). We explore how much of the variability in the data can be explained by variations of the initial conditions and by the level of CO 2 perturbation. Nine mesocosms of one experiment were sorted into three groups of high, medium, and low calcification rates and analysed separately. The spread of the three optimised ensemble model solutions captures most of the observed variability. Our results show that small variations in initial abundance of coccolithophores and the prevailing physiological acclimation states generate differences in calcification that are larger than those induced by ocean acidification. Accordingly, large deviations between optimal mass flux estimates of carbon and of nitrogen are identified even between mesocosms that were subject to similar ocean acidification conditions. With our model-based data analysis we document how an ocean acidification response signal in calcification can be disentangled from the observed variability in PIC. |
format |
Text |
author |
Krishna, Shubham Schartau, Markus |
spellingShingle |
Krishna, Shubham Schartau, Markus A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment |
author_facet |
Krishna, Shubham Schartau, Markus |
author_sort |
Krishna, Shubham |
title |
A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment |
title_short |
A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment |
title_full |
A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment |
title_fullStr |
A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment |
title_full_unstemmed |
A data–model synthesis to explain variability in calcification observed during a CO2 perturbation mesocosm experiment |
title_sort |
data–model synthesis to explain variability in calcification observed during a co2 perturbation mesocosm experiment |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-14-1857-2017 https://www.biogeosciences.net/14/1857/2017/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-14-1857-2017 https://www.biogeosciences.net/14/1857/2017/ |
op_doi |
https://doi.org/10.5194/bg-14-1857-2017 |
container_title |
Biogeosciences |
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14 |
container_issue |
7 |
container_start_page |
1857 |
op_container_end_page |
1882 |
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1766156009540157440 |