Data Description

Citation:
Müller, MN et al. (2014): Influence of temperature and CO2 on the strontium and magnesium composition of coccolithophore calcite. doi:10.1594/PANGAEA.834251,
Supplement to: 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. Biogeosciences, 11(4), 1065-1075, doi:10.5194/bg-11-1065-2014
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 *
Project(s):
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
1Experiment *ExpMüller, Marius N *
2Species *SpeciesMüller, Marius N *
3Temperature, water *Temp°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 deviation *pCO2 std dev±Müller, Marius N *
6Strontium/Calcium ratio *Sr/Cammol/molMüller, Marius N *
7Strontium, partition coefficient *Sr DMüller, Marius N *
8Magnesium/Calcium ratio *Mg/Cammol/molMüller, Marius N *
9Magnesium distribution coefficient *Mg dist coef10-3Müller, Marius N *
10Phosphorus/Calcium ratio *P/Cammol/molMüller, Marius N *
11Iron/Calcium ratio *Fe/Cammol/molMüller, Marius N *
12Irradiance *EµE/m2/sMüller, Marius N *
13Light:Dark cycle *L:Dhh:hhMüller, Marius N *
14Strontium/Calcium ratio *Sr/Cammol/molMüller, Marius N *seawater
15Strontium/Calcium, standard deviation *Sr/Ca std dev±Müller, Marius N *seawater
16Magnesium/Calcium ratio *Mg/Cammol/molMüller, Marius N *seawater
17Magnesium/Calcium ratio, standard deviation *Mg/Ca std dev±Müller, Marius N *seawater
18Salinity *SalMüller, Marius N *
19pH *pHMüller, Marius N *Calculated using CO2SYS *total scale
20pH, standard deviation *pH std dev±Müller, Marius N *Calculated using CO2SYS *total scale
21Calcite saturation state *Omega CalMüller, Marius N *Calculated using CO2SYS *
22Calcite saturation state, standard deviation *Omega Cal std dev±Müller, Marius N *Calculated using CO2SYS *
23Carbon, inorganic, dissolved *DICµmol/kgMüller, Marius N *Coulometric titration *
24Carbon, inorganic, dissolved, standard deviation *DIC std dev±Müller, Marius N *Coulometric titration *
25Alkalinity, total *ATµmol/kgMüller, Marius N *Potentiometric titration *
26Alkalinity, total, standard deviation *AT std dev±Müller, Marius N *Potentiometric titration *
27Carbon dioxide *CO2µmol/kgMüller, Marius N *Calculated using CO2SYS *
28Carbon dioxide, standard deviation *CO2 std dev±Müller, Marius N *Calculated using CO2SYS *
29Bicarbonate ion *[HCO3]-µmol/kgMüller, Marius N *Calculated using CO2SYS *
30Bicarbonate ion, standard deviation *[HCO3]- std dev±Müller, Marius N *Calculated using CO2SYS *
31Carbonate ion *[CO3]2-µmol/kgMüller, Marius N *Calculated using CO2SYS *
32Carbonate ion, standard deviation *[CO3]2- std dev±Müller, Marius N *Calculated using CO2SYS *
33Growth rate *µ1/dayMüller, Marius N *
34Growth rate, standard deviation *µ std dev±Müller, Marius N *
35Production of particulate organic carbon per cell *POC prodpg/#/dayMüller, Marius N *
36Particulate organic carbon, production, standard deviation *POC prod std dev±Müller, Marius N *
37Particulate inorganic carbon production per cell *PIC prodpg/#/dayMüller, Marius N *
38Particulate inorganic carbon, production, standard deviation *PIC prod std dev±Müller, Marius N *
39Nitrogen, total particulate production per cell *TPN prodpg/#/dayMüller, Marius N *
40Nitrogen, total particulate production standard deviation *TPN prod std dev±Müller, Marius N *
41Chlorophyll a, production, per cell *Chl a prodpg/#/dayMüller, Marius N *
42Chlorophyll a, production, standard deviation *Chl a prod±Müller, Marius N *
43Particulate inorganic carbon/particulate organic carbon ratio *PIC/POC ratioMüller, Marius N *
44Particulate inorganic carbon/particulate organic carbon ratio, standard deviation *PIC/POC ratio std dev±Müller, Marius N *
45Carbon, organic, particulate/Nitrogen, particulate ratio *POC/PNMüller, Marius N *
46Carbon, organic, particulate/Nitrogen, particulate ratio, standard deviation *POC/PN std dev±Müller, Marius N *
47Carbonate system computation flag *CSC flagYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
48pH *pHYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *total scale
49Carbon dioxide *CO2µmol/kgYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
50Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
51Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
52Bicarbonate ion *[HCO3]-µmol/kgYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
53Carbonate ion *[CO3]2-µmol/kgYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
54Aragonite saturation state *Omega ArgYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
55Calcite saturation state *Omega CalYang, Yan *Calculated using seacarb after Nisumaa et al. (2010) *
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