Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010
Coccolithophores play an important role in organic matter export due to their production of the mineral calcite that can act as ballast. Recent studies indicated that calcification in coccolithophores may be affected by changes in seawater carbonate chemistry. We investigated the influence of CO2 on...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.778432 2023-05-15T17:52:08+02:00 Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 Biermann, Antje Engel, Anja DATE/TIME START: 2007-06-07T00:00:00 * DATE/TIME END: 2007-06-14T00:00:00 2010-03-29 text/tab-separated-values, 246 data points https://doi.pangaea.de/10.1594/PANGAEA.778432 https://doi.org/10.1594/PANGAEA.778432 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.778432 https://doi.org/10.1594/PANGAEA.778432 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Biermann, Antje; Engel, Anja (2010): Effect of CO2 on the properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi. Biogeosciences, 7(3), 1017-1029, https://doi.org/10.5194/bg-7-1017-2010 Alkalinity Gran titration (Gran 1950) total standard deviation Aragonite saturation state Bacteria abundance dry mass Bicarbonate ion Biomass/Abundance/Elemental composition Calcite saturation state Calculated Calculated using CO2SYS Calculated using seacarb after Nisumaa et al. (2010) Carbon inorganic dissolved particulate per volume organic Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.778432 https://doi.org/10.5194/bg-7-1017-2010 2023-01-20T08:53:42Z Coccolithophores play an important role in organic matter export due to their production of the mineral calcite that can act as ballast. Recent studies indicated that calcification in coccolithophores may be affected by changes in seawater carbonate chemistry. We investigated the influence of CO2 on the aggregation and sinking behaviour of the coccolithophore Emiliania huxleyi (PML B92/11) during a laboratory experiment. The coccolithophores were grown under low (~180 µatm), medium (~380 µatm), and high (~750 µatm) CO2 conditions. Aggregation of the cells was promoted using roller tables. Size and settling velocity of aggregates were determined during the incubation using video image analysis. Our results indicate that aggregate properties are sensitive to changes in the degree of ballasting, as evoked by ocean acidification. Average sinking velocity was highest for low CO2 aggregates (~1292 m d-1) that also had the highest particulate inorganic to particulate organic carbon (PIC/POC) ratio. Lowest PIC/POC ratios and lowest sinking velocity (~366 m d-1) at comparable sizes were observed for aggregates of the high CO2 treatment. Aggregates of the high CO2 treatment showed a 4-fold lower excess density (~4.2*10**-4 g cm**-3) when compared to aggregates from the medium and low CO2 treatments (~1.7 g*10**-3 cm**-3). We also observed that more aggregates formed in the high CO2 treatment, and that those aggregates contained more bacteria than aggregates in the medium and low CO2 treatment. If applicable to the future ocean, our findings suggest that a CO2 induced reduction of the calcite content of aggregates could weaken the deep export of organic matter in the ocean, particularly in areas dominated by coccolithophores. Dataset Ocean acidification PANGAEA - Data Publisher for Earth & Environmental Science |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Alkalinity Gran titration (Gran 1950) total standard deviation Aragonite saturation state Bacteria abundance dry mass Bicarbonate ion Biomass/Abundance/Elemental composition Calcite saturation state Calculated Calculated using CO2SYS Calculated using seacarb after Nisumaa et al. (2010) Carbon inorganic dissolved particulate per volume organic |
spellingShingle |
Alkalinity Gran titration (Gran 1950) total standard deviation Aragonite saturation state Bacteria abundance dry mass Bicarbonate ion Biomass/Abundance/Elemental composition Calcite saturation state Calculated Calculated using CO2SYS Calculated using seacarb after Nisumaa et al. (2010) Carbon inorganic dissolved particulate per volume organic Biermann, Antje Engel, Anja Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 |
topic_facet |
Alkalinity Gran titration (Gran 1950) total standard deviation Aragonite saturation state Bacteria abundance dry mass Bicarbonate ion Biomass/Abundance/Elemental composition Calcite saturation state Calculated Calculated using CO2SYS Calculated using seacarb after Nisumaa et al. (2010) Carbon inorganic dissolved particulate per volume organic |
description |
Coccolithophores play an important role in organic matter export due to their production of the mineral calcite that can act as ballast. Recent studies indicated that calcification in coccolithophores may be affected by changes in seawater carbonate chemistry. We investigated the influence of CO2 on the aggregation and sinking behaviour of the coccolithophore Emiliania huxleyi (PML B92/11) during a laboratory experiment. The coccolithophores were grown under low (~180 µatm), medium (~380 µatm), and high (~750 µatm) CO2 conditions. Aggregation of the cells was promoted using roller tables. Size and settling velocity of aggregates were determined during the incubation using video image analysis. Our results indicate that aggregate properties are sensitive to changes in the degree of ballasting, as evoked by ocean acidification. Average sinking velocity was highest for low CO2 aggregates (~1292 m d-1) that also had the highest particulate inorganic to particulate organic carbon (PIC/POC) ratio. Lowest PIC/POC ratios and lowest sinking velocity (~366 m d-1) at comparable sizes were observed for aggregates of the high CO2 treatment. Aggregates of the high CO2 treatment showed a 4-fold lower excess density (~4.2*10**-4 g cm**-3) when compared to aggregates from the medium and low CO2 treatments (~1.7 g*10**-3 cm**-3). We also observed that more aggregates formed in the high CO2 treatment, and that those aggregates contained more bacteria than aggregates in the medium and low CO2 treatment. If applicable to the future ocean, our findings suggest that a CO2 induced reduction of the calcite content of aggregates could weaken the deep export of organic matter in the ocean, particularly in areas dominated by coccolithophores. |
format |
Dataset |
author |
Biermann, Antje Engel, Anja |
author_facet |
Biermann, Antje Engel, Anja |
author_sort |
Biermann, Antje |
title |
Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 |
title_short |
Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 |
title_full |
Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 |
title_fullStr |
Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 |
title_full_unstemmed |
Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 |
title_sort |
seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore emiliania huxleyi, 2010 |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.778432 https://doi.org/10.1594/PANGAEA.778432 |
op_coverage |
DATE/TIME START: 2007-06-07T00:00:00 * DATE/TIME END: 2007-06-14T00:00:00 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Supplement to: Biermann, Antje; Engel, Anja (2010): Effect of CO2 on the properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi. Biogeosciences, 7(3), 1017-1029, https://doi.org/10.5194/bg-7-1017-2010 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.778432 https://doi.org/10.1594/PANGAEA.778432 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.778432 https://doi.org/10.5194/bg-7-1017-2010 |
_version_ |
1766159478378463232 |