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Biermann, Antje; Engel, Anja (2012): Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010. doi:10.1594/PANGAEA.778432,
Supplement to: Biermann, A; Engel, A (2010): Effect of CO2 on the properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi. Biogeosciences, 7(3), 1017-1029, doi:10.5194/bg-7-1017-2010

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Abstract:
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.
Coverage:
Date/Time Start: 2007-06-07T00:00:00 * Date/Time End: 2007-06-14T00:00:00
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Experimental treatmentExp trtmBiermann, Antje
2DATE/TIMEDate/TimeGeocode
3Experiment dayExp daydayBiermann, Antje
4SalinitySalBiermann, AntjeConductivity meter (WTW, Weilheim, Gemany)
5Temperature, waterTemp°CBiermann, AntjeConductivity and pH meter, pH/Cond 340i (WTW, Weilheim)
6Light:Dark cycleL:Dhh:hhBiermann, Antje
7Radiation, photosynthetically activePARµE/m2/sBiermann, Antje
8pHpHBiermann, AntjeConductivity and pH meter, pH/Cond 340i (WTW, Weilheim)NBS scale
9pH, standard deviationpH std dev±Biermann, Antje
10Alkalinity, totalATµmol/kgBiermann, AntjeAlkalinity, Gran titration (Gran, 1950)
11Alkalinity, total, standard deviationAT std dev±Biermann, Antje
12Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmBiermann, AntjeCalculated using CO2SYS
13Carbon dioxide, partial pressure, standard deviationpCO2 std dev±Biermann, Antje
14Calcite saturation stateOmega CalBiermann, AntjeCalculated using CO2SYS
15Calcite saturation state, standard deviationOmega Cal std dev±Biermann, Antje
16Particle volume concentrationPart v concmm3/lBiermann, Antje
17Particle volume concentration, standard deviationPart c conc std dev±Biermann, Antje
18Carbon, total particulateTPCµg/lBiermann, AntjeElement analyser CNS, EURO EA
19Carbon, total, particulate, standard deviationTPC std dev±Biermann, Antje
20Carbon, organic, particulatePOCmg/lBiermann, AntjeElement analyser CNS, EURO EA
21Carbon, organic, particulate, standard deviationPOC std dev±Biermann, Antje
22Carbon, inorganic, particulatePICµg/lBiermann, AntjeCalculated
23Carbon, inorganic, particulate, per volume, standard deviationPIC std dev±Biermann, Antje
24Nitrogen, total particulateTPNµg/lBiermann, AntjeElement analyser CNS, EURO EA
25Nitrogen, total, standard deviationTN std dev±Biermann, Antje
26Bacteria, dry massBact dmmg/lBiermann, AntjeFACSCalibur flow-cytometer (Becton Dicinson)
27Bacteria, dry mass, standard deviationBact DW std dev±Biermann, Antje
28BacteriaBact#/mlBiermann, Antje
29Bacteria, abundance, standard deviationBact abund std dev±Biermann, Antje
30Sinking velocitySinking velocitycm/sBiermann, Antjesee reference(s)
31Sinking velocity, standard deviationSinking velocity std dev±Biermann, Antje
32Cells equivalent spherical diameterESDcmBiermann, Antjesee reference(s)
33Cells equivalent spherical diameter, standard deviationESD std dev±Biermann, Antje
34DensityDensityg/cm3Biermann, Antjesee reference(s)
35Density, standard deviationDensity std dev±Biermann, Antje
36PorosityPoros% volBiermann, Antjesee reference(s)
37Porosity, standard deviationPoros std dev±Biermann, Antje
38Particulate inorganic carbon/particulate organic carbon ratioPIC/POC ratioBiermann, Antje
39Particulate inorganic carbon/particulate organic carbon ratio, standard deviationPIC/POC ratio std dev±Biermann, Antje
40Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
41pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
42Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
43Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
44Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
45Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
46Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
47Carbon, inorganic, dissolvedDICµmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
48Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
49Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
Size:
246 data points

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