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Krug, Sebastian; Schulz, Kai Georg; Riebesell, Ulf (2011): Seawater carbonate chemistry and biological processes during experiments with Coccolithus braarudii, 2011. PANGAEA,, Supplement to: Krug, S et al. (2011): Effects of changes in carbonate chemistry speciation on Coccolithus braarudii: a discussion of coccolithophorid sensitivities. Biogeosciences, 8(3), 771-777,

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Ocean acidification and associated shifts in carbonate chemistry speciation induced by increasing levels of atmospheric carbon dioxide (CO2) have the potential to impact marine biota in various ways. The process of biogenic calcification, for instance, is usually shown to be negatively affected. In coccolithophores, an important group of pelagic calcifiers, changes in cellular calcification rates in response to changing ocean carbonate chemistry appear to differ among species. By applying a wider CO2 range we show that a species previously reported insensitive to seawater acidification, Coccolithusbraarudii, responds both in terms of calcification and photosynthesis, although at higher levels of CO2. Thus, observed differences between species seem to be related to individual sensitivities while the underlying mechanisms could be the same. On this basis we develop a conceptual model of coccolithophorid calcification and photosynthesis in response to CO2-induced changes in seawater carbonate chemistry speciation.
Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Chromista; Coccolithus braarudii; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species; South Atlantic
Seventh Framework Programme (FP7), grant/award no. 211384: European Project on Ocean Acidification
Sixth Framework Programme (FP6), grant/award no. 511106: European network of excellence for Ocean Ecosystems Analysis
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).
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Experimental treatmentExp treatKrug, Sebastian
2IdentificationIDKrug, Sebastian
3SalinitySalKrug, Sebastian
4Temperature, waterTemp°CKrug, Sebastian
5Radiation, photosynthetically activePARµmol/m2/sKrug, Sebastian
6Light:Dark cycleL:Dhh:hhKrug, Sebastian
7NitrateNITRATEµmol/kgKrug, Sebastian
8PhosphatePHSPHTµmol/kgKrug, Sebastian
9Carbon, inorganic, dissolvedDICµmol/kgKrug, SebastianPhotometrically using autoanalyzer QUAATRO
10Alkalinity, totalATµmol/kgKrug, SebastianTitration potentiometric, 794 Basic Titrino (Metrohm)
11Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmKrug, Sebastian
12Carbon dioxideCO2µmol/kgKrug, Sebastian
13Bicarbonate ion[HCO3]-µmol/kgKrug, Sebastian
14Carbonate ion[CO3]2-µmol/kgKrug, Sebastian
15Calcite saturation stateOmega CalKrug, Sebastian
16pHpHKrug, SebastianTotal scale
17Production of particulate inorganic carbon per cellPIC prodµmol/#/dayKrug, SebastianThermal conductivity meter
18Production of particulate organic carbon per cellPOC prodµmol/#/dayKrug, SebastianThermal conductivity meter
19Particulate inorganic carbon/particulate organic carbon ratioPIC/POCKrug, Sebastian
20Carbon, organic, particulate/Nitrogen, organic, particulate ratioPOC/PONKrug, SebastianMeasured
21Coccolithus braarudii, sizeC. braarudii sizeµmKrug, SebastianCoulter counter
22Coccolithus braarudii, size, standard deviationC. braarudii size std dev±Krug, SebastianCoulter counter
23Growth rateµ#/dayKrug, SebastianCalculated, see reference(s)
24Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
25pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
26Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
27Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
28Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
29Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
30Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
31Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
32Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
930 data points

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