Data Description

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Citation:
Biermann, A; Engel, A (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, 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, doi:10.5194/bg-7-1017-2010
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.
Project(s):
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 treatment *Exp trtmBiermann, Antje *
2DATE/TIME *Date/TimeGeocode
3Experiment day *Exp daydayBiermann, Antje *
4Salinity *SalBiermann, Antje *Conductivity meter (WTW, Weilheim, Gemany) *
5Temperature, water *Temp°CBiermann, Antje *Conductivity and pH meter, pH/Cond 340i (WTW, Weilheim) *
6Light:Dark cycle *L:Dhh:hhBiermann, Antje *
7Radiation, photosynthetically active *PARµE/m2/sBiermann, Antje *
8pH *pHBiermann, Antje *Conductivity and pH meter, pH/Cond 340i (WTW, Weilheim) *NBS scale
9pH, standard deviation *pH std dev±Biermann, Antje *
10Alkalinity, total *ATµmol/kgBiermann, Antje *Alkalinity, Gran titration (Gran, 1950) *
11Alkalinity, total, standard deviation *AT std dev±Biermann, Antje *
12Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmBiermann, Antje *Calculated using CO2SYS *
13Carbon dioxide, partial pressure, standard deviation *pCO2 std dev±Biermann, Antje *
14Calcite saturation state *Omega CalBiermann, Antje *Calculated using CO2SYS *
15Calcite saturation state, standard deviation *Omega Cal std dev±Biermann, Antje *
16Particle volume concentration *Part v concmm3/lBiermann, Antje *
17Particle volume concentration, standard deviation *Part c conc std dev±Biermann, Antje *
18Carbon, total particulate *TPCµg/lBiermann, Antje *Element analyser CNS, EURO EA *
19Carbon, total, particulate, standard deviation *TPC std dev±Biermann, Antje *
20Carbon, organic, particulate *POCmg/lBiermann, Antje *Element analyser CNS, EURO EA *
21Carbon, organic, particulate, standard deviation *POC std dev±Biermann, Antje *
22Carbon, inorganic, particulate *PICµg/lBiermann, Antje *Calculated *
23Carbon, inorganic, particulate, per volume, standard deviation *PIC std dev±Biermann, Antje *
24Nitrogen, total particulate *TPNµg/lBiermann, Antje *Element analyser CNS, EURO EA *
25Nitrogen, total, standard deviation *TN std dev±Biermann, Antje *
26Bacteria, dry mass *Bact dmmg/lBiermann, Antje *FACSCalibur flow-cytometer (Becton Dicinson) *
27Bacteria, dry mass, standard deviation *Bact DW std dev±Biermann, Antje *
28Bacteria *Bact#/mlBiermann, Antje *
29Bacteria, abundance, standard deviation *Bact abund std dev±Biermann, Antje *
30Sinking velocity *Sinking velocitycm/sBiermann, Antje *see reference(s) *
31Sinking velocity, standard deviation *Sinking velocity std dev±Biermann, Antje *
32Cells equivalent spherical diameter *ESDcmBiermann, Antje *see reference(s) *
33Cells equivalent spherical diameter, standard deviation *ESD std dev±Biermann, Antje *
34Density *Densityg/cm3Biermann, Antje *see reference(s) *
35Density, standard deviation *Density std dev±Biermann, Antje *
36Porosity *Poros% volBiermann, Antje *see reference(s) *
37Porosity, standard deviation *Poros std dev±Biermann, Antje *
38Particulate inorganic carbon/particulate organic carbon ratio *PIC/POC ratioBiermann, Antje *
39Particulate inorganic carbon/particulate organic carbon ratio, standard deviation *PIC/POC ratio std dev±Biermann, Antje *
40Carbonate system computation flag *CSC flagNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
41pH *pHNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *Total scale
42Carbon dioxide *CO2µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
43Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
44Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
45Bicarbonate ion *[HCO3]-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
46Carbonate ion *[CO3]2-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
47Carbon, inorganic, dissolved *DICµmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
48Aragonite saturation state *Omega ArgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
49Calcite saturation state *Omega CalNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
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