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Müller, Marius N; Lebrato, Mario; Riebesell, Ulf; Barcelos e Ramos, Joana; Schulz, Kai Georg; Blanco-Ameijeiras, S; Sett, Scarlett; Eisenhauer, Anton; Stoll, Heather M (2014): Influence of temperature and CO2 on the strontium and magnesium composition of coccolithophore calcite. doi:10.1594/PANGAEA.834251,
Supplement to: Müller, MN et al. (2014): Influence of temperature and CO2 on the strontium and magnesium composition of coccolithophore calcite. Biogeosciences, 11(4), 1065-1075, doi:10.5194/bg-11-1065-2014

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Abstract:
Marine calcareous sediments provide a fundamental basis for palaeoceanographic studies aiming to reconstruct past oceanic conditions and understand key biogeochemical element cycles. Calcifying unicellular phytoplankton (coccolithophores) are a major contributor to both carbon and calcium cycling by photosynthesis and the production of calcite (coccoliths) in the euphotic zone, and the subsequent long-term deposition and burial into marine sediments. Here we present data from controlled laboratory experiments on four coccolithophore species and elucidate the relation between the divalent cation (Sr, Mg and Ca) partitioning in coccoliths and cellular physiology (growth, calcification and photosynthesis). Coccolithophores were cultured under different seawater temperature and carbonate chemistry conditions. The partition coefficient of strontium (DSr) was positively correlated with both carbon dioxide (pCO2) and temperature but displayed no coherent relation to particulate organic and inorganic carbon production rates. Furthermore, DSr correlated positively with cellular growth rates when driven by temperature but no correlation was present when changes in growth rates were pCO2-induced. Our results demonstrate the complex interaction between environmental forcing and physiological control on the strontium partitioning in coccolithophore calcite and challenge interpretations of the coccolith Sr / Ca ratio from high-pCO2 environments (e.g. Palaeocene-Eocene thermal maximum). The partition coefficient of magnesium (DMg) displayed species-specific differences and elevated values under nutrient limitation. No conclusive correlation between coccolith DMg and temperature was observed but pCO2 induced a rising trend in coccolith DMg. Interestingly, the best correlation was found between coccolith DMg and chlorophyll a production, suggesting that chlorophyll a and calcite associated Mg originate from the same intracellular pool. These and previous findings indicate that Mg is transported into the cell and to the site of calcification via different pathways than Ca and Sr. Consequently, the coccolith Mg / Ca ratio should be decoupled from the seawater Mg / Ca ratio. This study gives an extended insight into the driving factors influencing the coccolith Mg / Ca ratio and should be considered for future palaeoproxy calibrations.
Further details:
Lavigne, Héloise; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0. https://cran.r-project.org/package=seacarb
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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). The date of carbonate chemistry calculation is 2014-07-23.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1ExperimentExpMüller, Marius N
2SpeciesSpeciesMüller, Marius N
3Temperature, waterTemp°CMüller, Marius N
4Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmMüller, Marius N
5Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Müller, Marius N
6Strontium/Calcium ratioSr/Cammol/molMüller, Marius N
7Strontium, partition coefficientSr DMüller, Marius N
8Magnesium/Calcium ratioMg/Cammol/molMüller, Marius N
9Magnesium distribution coefficientMg dist coef10-3Müller, Marius N
10Phosphorus/Calcium ratioP/Cammol/molMüller, Marius N
11Iron/Calcium ratioFe/Cammol/molMüller, Marius N
12IrradianceEµE/m2/sMüller, Marius N
13Light:Dark cycleL:Dhh:hhMüller, Marius N
14Strontium/Calcium ratioSr/Cammol/molMüller, Marius Nseawater
15Strontium/Calcium ratio, standard deviationSr/Ca std dev±Müller, Marius Nseawater
16Magnesium/Calcium ratioMg/Cammol/molMüller, Marius Nseawater
17Magnesium/Calcium ratio, standard deviationMg/Ca std dev±Müller, Marius Nseawater
18SalinitySalMüller, Marius N
19pHpHMüller, Marius NCalculated using CO2SYStotal scale
20pH, standard deviationpH std dev±Müller, Marius NCalculated using CO2SYStotal scale
21Calcite saturation stateOmega CalMüller, Marius NCalculated using CO2SYS
22Calcite saturation state, standard deviationOmega Cal std dev±Müller, Marius NCalculated using CO2SYS
23Carbon, inorganic, dissolvedDICµmol/kgMüller, Marius NCoulometric titration
24Carbon, inorganic, dissolved, standard deviationDIC std dev±Müller, Marius NCoulometric titration
25Alkalinity, totalATµmol/kgMüller, Marius NPotentiometric titration
26Alkalinity, total, standard deviationAT std dev±Müller, Marius NPotentiometric titration
27Carbon dioxideCO2µmol/kgMüller, Marius NCalculated using CO2SYS
28Carbon dioxide, standard deviationCO2 std dev±Müller, Marius NCalculated using CO2SYS
29Bicarbonate ion[HCO3]-µmol/kgMüller, Marius NCalculated using CO2SYS
30Bicarbonate ion, standard deviation[HCO3]- std dev±Müller, Marius NCalculated using CO2SYS
31Carbonate ion[CO3]2-µmol/kgMüller, Marius NCalculated using CO2SYS
32Carbonate ion, standard deviation[CO3]2- std dev±Müller, Marius NCalculated using CO2SYS
33Growth rateµ1/dayMüller, Marius N
34Growth rate, standard deviationµ std dev±Müller, Marius N
35Production of particulate organic carbon per cellPOC prodpg/#/dayMüller, Marius N
36Particulate organic carbon, production, standard deviationPOC prod std dev±Müller, Marius N
37Particulate inorganic carbon production per cellPIC prodpg/#/dayMüller, Marius N
38Particulate inorganic carbon, production, standard deviationPIC prod std dev±Müller, Marius N
39Nitrogen, total particulate production per cellTPN prodpg/#/dayMüller, Marius N
40Nitrogen, total particulate production standard deviationTPN prod std dev±Müller, Marius N
41Chlorophyll a, production, per cellChl a prodpg/#/dayMüller, Marius N
42Chlorophyll a, production, standard deviationChl a prod±Müller, Marius N
43Particulate inorganic carbon/particulate organic carbon ratioPIC/POC ratioMüller, Marius N
44Particulate inorganic carbon/particulate organic carbon ratio, standard deviationPIC/POC ratio std dev±Müller, Marius N
45Carbon, organic, particulate/Nitrogen, particulate ratioPOC/PNMüller, Marius N
46Carbon, organic, particulate/Nitrogen, particulate ratio, standard deviationPOC/PN std dev±Müller, Marius N
47Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
48pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
49Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
50Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
51Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
52Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
53Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
54Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
55Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
2247 data points

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