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Ziveri, Patrizia; Thoms, Silke; Probert, Ian; Geisen, Markus; Langer, Gerald (2012): Experimental data of CO2, CO3, Omega calcite saturation, pH values, alpha and epsilon fractionation factors, and Dδ¹⁸O calctite-water. PANGAEA, https://doi.org/10.1594/PANGAEA.808168, Supplement to: Ziveri, P et al. (2012): A universal carbonate ion effect on stable oxygen isotope ratios in unicellular planktonic calcifying organisms. Biogeosciences, 9, 1025-1032, https://doi.org/10.5194/bg-9-1025-2012

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Abstract:
The oxygen isotopic composition (d18O) of calcium carbonate of planktonic calcifying organisms is a key tool for reconstructing both past seawater temperature and salinity. The calibration of paloeceanographic proxies relies in general on empirical relationships derived from field experiments on extant species. Laboratory experiments have more often than not revealed that variables other than the target parameter influence the proxy signal, which makes proxy calibration a challenging task. Understanding these secondary or "vital" effects is crucial for increasing proxy accuracy. We present data from laboratory experiments showing that oxygen isotope fractionation during calcification in the coccolithophore Calcidiscus leptoporus and the calcareous dinoflagellate Thoracosphaera heimii is dependent on carbonate chemistry of seawater in addition to its dependence on temperature. A similar result has previously been reported for planktonic foraminifera, supporting the idea that the [CO3]2- effect on d18O is universal for unicellular calcifying planktonic organisms. The slopes of the d18O/[CO3]2- relationships range between -0.0243 per mil/(µmol/kg) (calcareous dinoflagellate T. heimii) and the previously published -0.0022 per mil/(µmol/kg) (non-symbiotic planktonic foramifera Orbulina universa), while C. leptoporus has a slope of -0.0048 per mil/(µmol/kg). We present a simple conceptual model, based on the contribution of d18O-enriched [HCO3]- to the [CO3]2- pool in the calcifying vesicle, which can explain the [CO3]2- effect on d18O for the different unicellular calcifiers. This approach provides a new insight into biological fractionation in calcifying organisms. The large range in d18O/[CO3]2- slopes should possibly be explored as a means for paleoreconstruction of surface [CO3]2-, particularly through comparison of the response in ecologically similar planktonic organisms.
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Seventh Framework Programme (FP7), grant/award no. 265103: Mediterranean Sea Acidification in a Changing Climate
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
SpeciesSpeciesZiveri, Patrizia
Carbon dioxide, partial pressurepCO2µatmZiveri, Patrizia
Carbonate ion[CO3]2-µmol/kgZiveri, Patrizia
Calcite saturation stateOmega CalZiveri, PatriziaOmega calcite
pHpHZiveri, Patriziatotal scale
Fractionation factorFrac FactorZiveri, Patriziaalpha(chi-H2O), calcite-water
Fractionation factorFrac FactorZiveri, Patriziaepsilon(chi-H2O), calcite-water
Δδ18OΔδ18OZiveri, Patriziad18Ocalcite - d18Owater with respect to PDB
Size:
192 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Species

pCO2 [µatm]

[CO3]2- [µmol/kg]

Omega Cal
(Omega calcite)

pH
(total scale)

Frac Factor
(alpha(chi-H2O), calcite-water)

Frac Factor
(epsilon(chi-H2O), calcite-water)

Δδ18O []
(d18Ocalcite - d18Owater with ...)
Calcidiscus leptoporus953.378.51.957.841.027827.84-2.66
Calcidiscus leptoporus914.682.62.067.861.027827.76-2.73
Calcidiscus leptoporus891.684.32.107.871.027827.79-2.71
Calcidiscus leptoporus636.0103.42.518.001.028328.29-2.22
Calcidiscus leptoporus617.0105.42.568.001.028328.26-2.25
Calcidiscus leptoporus619.0105.62.568.001.028428.35-2.16
Calcidiscus leptoporus377.0161.73.928.241.027727.68-2.81
Calcidiscus leptoporus379.0162.83.958.241.027927.87-2.63
Calcidiscus leptoporus369.0166.04.038.241.027827.79-2.71
Calcidiscus leptoporus350.3199.74.978.261.027527.45-3.03
Calcidiscus leptoporus351.1200.14.988.261.027627.61-2.89
Calcidiscus leptoporus332.6207.95.178.281.027727.71-2.79
Calcidiscus leptoporus262.0214.15.208.401.027427.38-3.11
Calcidiscus leptoporus256.0219.25.328.401.027427.39-3.10
Calcidiscus leptoporus237.0233.15.668.401.027427.42-3.07
Calcidiscus leptoporus104.2493.812.298.721.025825.78-4.66
Calcidiscus leptoporus93.0530.213.198.761.026126.11-4.34
Thoracosphaera heimii205.3239.43.748.281.027327.29-3.19
Thoracosphaera heimii208.0238.23.728.011.027227.19-3.29
Thoracosphaera heimii439.9146.42.298.011.029729.46-0.52
Thoracosphaera heimii464.1140.02.197.991.029630.04-1.09
Thoracosphaera heimii599.4117.71.847.901.030330.33-0.24
Thoracosphaera heimii603.2116.31.827.891.029829.82-0.74
Thoracosphaera heimii653.8110.21.727.861.030130.10-0.47