Biermann, Antje; Engel, Anja (2010): Seawater carbonate chemistry and its effects on properties and sinking velocity of aggregates of the coccolithophore Emiliania huxleyi, 2010 [dataset]. PANGAEA, https://doi.org/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, https://doi.org/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.
Keyword(s):
Project(s):
Funding:
Sixth Framework Programme (FP6), grant/award no. 511106: European network of excellence for Ocean Ecosystems Analysis
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):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
246 data points
Data
1 Exp treat | 2 Date/Time | 3 Exp day [day] | 4 Sal (Conductivity meter (WTW, Weil...) | 5 Temp [°C] (Conductivity and pH meter, pH...) | 6 L:D [hh:hh] | 7 PAR [µmol/m2/s] | 8 pH (NBS scale, Conductivity and p...) | 9 pH std dev [±] | 10 AT [µmol/kg] (Alkalinity, Gran titration (G...) | 11 AT std dev [±] | 12 pCO2water_SST_wet [µatm] (Calculated using CO2SYS) | 13 pCO2 std dev [±] | 14 Omega Cal (Calculated using CO2SYS) | 15 Omega Cal std dev [±] | 16 Part vol conc [mm3/l] | 17 Part vol conc std dev [±] | 18 TPC [µg/l] (Element analyser CNS, EURO EA) | 19 TPC std dev [±] | 20 POC [mg/l] (Element analyser CNS, EURO EA) | 21 POC std dev [±] | 22 PIC [µg/l] (Calculated) | 23 PIC std dev [±] | 24 TPN [µg/l] (Element analyser CNS, EURO EA) | 25 TN std dev [±] | 26 Bact dm [mg/l] (FACSCalibur flow-cytometer (B...) | 27 Bact DW std dev [±] | 28 Bact [#/ml] | 29 Bact abund std dev [±] | 30 Sinking V [cm/s] (see reference(s)) | 31 Sinking V std dev [±] | 32 ESD [cm] (see reference(s)) | 33 ESD std dev [±] | 34 Density [g/cm3] (see reference(s)) | 35 Density std dev [±] | 36 Poros [% vol] (see reference(s)) | 37 Poros std dev [±] | 38 PIC/POC | 39 PIC/POC ratio std dev [±] | 40 CSC flag (Calculated using seacarb afte...) | 41 pH (Total scale, Calculated using...) | 42 CO2 [µmol/kg] (Calculated using seacarb afte...) | 43 pCO2water_SST_wet [µatm] (Calculated using seacarb afte...) | 44 fCO2water_SST_wet [µatm] (Calculated using seacarb afte...) | 45 [HCO3]- [µmol/kg] (Calculated using seacarb afte...) | 46 [CO3]2- [µmol/kg] (Calculated using seacarb afte...) | 47 DIC [µmol/kg] (Calculated using seacarb afte...) | 48 Omega Arg (Calculated using seacarb afte...) | 49 Omega Cal (Calculated using seacarb afte...) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Low CO2 | 2007-06-07 | 14 | 32.3 | 17.5 | 16:08 | 218 | 9.3 | 1069 | 4 | 6.3 | 82.80 | 29900 | 1380 | 19.00 | 1.42 | 10900 | 2590 | 2130 | 80 | 778.0 | 64.5 | 727000 | 0.579 | 0.177 | 26 | 9.18 | 0.13 | 3.57 | 3.55 | 223.54 | 257.23 | 480.90 | 4.02 | 6.25 | ||||||||||||||
Medium CO2 | 2007-06-07 | 14 | 32.3 | 17.5 | 16:08 | 218 | 8.4 | 1007 | 102 | 2.3 | 112.00 | 47300 | 465 | 33.80 | 0.98 | 13500 | 1040 | 1900 | 82 | 908.0 | 48.5 | 3200000 | 0.399 | 0.041 | 26 | 8.23 | 3.60 | 102.19 | 101.84 | 719.67 | 93.03 | 816.30 | 1.45 | 2.26 | ||||||||||||||
High CO2 | 2007-06-07 | 14 | 32.3 | 16.7 | 16:08 | 218 | 7.8 | 1546 | 654 | 1.3 | 91.00 | 40700 | 2020 | 31.90 | 1.53 | 9420 | 4000 | 1860 | 114 | 750.0 | 110.0 | 1950000 | 0.298 | 0.140 | 26 | 7.71 | 23.54 | 653.50 | 651.22 | 1403.20 | 53.36 | 1480.10 | 0.83 | 1.30 | ||||||||||||||
Low CO2 (AGG) | 2007-06-14 | 21 | 32.3 | 16.9 | 16:08 | 218 | 8.8 | 0.2 | 1063 | 24 | 33 | 26 | 4.2 | 1.0 | 5.77 | 0.92 | 1370 | 353 | 1.22 | 0.33 | 150 | 100 | 134 | 48 | 39.9 | 15.8 | 277000 | 122000 | 1.500 | 0.439 | 0.268 | 0.085 | 0.00169 | 0.00237 | 99.9 | 0.20 | 0.127 | 0.096 | 26 | 8.68 | 0.90 | 25.24 | 25.15 | 504.42 | 180.17 | 685.50 | 2.81 | 4.38 |
Medium CO2 (AGG) | 2007-06-14 | 21 | 32.3 | 16.4 | 16:08 | 218 | 7.9 | 0.1 | 1415 | 121 | 496 | 127 | 1.4 | 0.1 | 10.20 | 3.55 | 3190 | 804 | 3.01 | 0.51 | 215 | 303 | 147 | 35 | 37.4 | 15.2 | 345000 | 176000 | 0.856 | 0.301 | 0.224 | 0.045 | 0.00172 | 0.00107 | 99.8 | 0.10 | 0.063 | 0.084 | 26 | 7.78 | 18.11 | 498.33 | 496.58 | 1261.86 | 55.83 | 1335.80 | 0.87 | 1.36 |
High CO2 (AGG) | 2007-06-14 | 21 | 32.3 | 16.5 | 16:08 | 218 | 7.6 | 0.0 | 1999 | 73 | 1431 | 228 | 1.1 | 0.1 | 19.50 | 6.33 | 5830 | 1450 | 5.81 | 1.41 | 130 | 95 | 311 | 95 | 38.2 | 16.5 | 551000 | 303000 | 0.424 | 0.190 | 0.367 | 0.090 | 0.00424 | 0.00345 | 100.0 | 0.03 | 0.023 | 0.017 | 26 | 7.48 | 54.11 | 1493.57 | 1488.35 | 1892.88 | 42.11 | 1989.10 | 0.66 | 1.02 |