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Russell, Ann D; Hönish, Bärbel; Spero, Howard J; Lea, David W (2004): Seawater carbonate chemistry, processes and elements during experiments with planktonic foraminifera Orbulina universa, 2004. PANGAEA, https://doi.org/10.1594/PANGAEA.721890, Supplement to: Russell, AD et al. (2004): Effects of seawater carbonate ion concentration and temperature on shell U, Mg, and Sr in cultured planktonic foraminifera. Geochimica et Cosmochimica Acta, 68(21), 4347-4361, https://doi.org/10.1016/j.gca.2004.03.013

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Abstract:
We investigate the sensitivity of U/Ca, Mg/Ca, and Sr/Ca to changes in seawater [CO3[2-]] and temperature in calcite produced by the two planktonic foraminifera species, Orbulina universa and Globigerina bulloides, in laboratory culture experiments. Our results demonstrate that at constant temperature, U/Ca in O. universa decreases by 25 +/- 7% per 100 µmol [CO3[2-]] kg**-1, as seawater [CO3[2-]] increases from 110 to 470 µmol kg**-1. Results from G. bulloides suggest a similar relationship, but U/Ca is consistently offset by ~+40% at the same environmental [CO3[2-]]. In O. universa, U/Ca is insensitive to temperature between 15°C and 25°C. Applying the O. universa relationship to three U/Ca records from a related species, Globigerinoides sacculifer, we estimate that Caribbean and tropical Atlantic [CO3[2-]] was 110 +/- 70 µmol kg**-1 and 80 +/- 40 µmol kg**-1 higher, respectively, during the last glacial period relative to the Holocene. This result is consistent with estimates of the glacial-interglacial change in surface water [CO3[2-]] based on both modeling and on boron isotope pH estimates. In settings where the addition of U by diagenetic processes is not a factor, down-core records of foraminiferal U/Ca have potential to provide information about changes in the ocean's carbonate concentration.
Event(s):
Russell_etal_04 * Device: Experiment (EXP)
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):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample IDSample IDRussell, Ann D
2SpeciesSpeciesRussell, Ann D
3Radiation, photosynthetically activePARµmol/m2/sRussell, Ann DLower limit
4Radiation, photosynthetically activePARµmol/m2/sRussell, Ann DHigher limit
5Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
6SalinitySalRussell, Ann D
7Temperature, waterTemp°CRussell, Ann D
8pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
9Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
10Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
11Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
12Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
13Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
14Carbon, inorganic, dissolvedDICµmol/kgRussell, Ann DCoulometric titration
15Alkalinity, totalATµmol/kgRussell, Ann DPotentiometric open-cell titration
16Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
17Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Calcite, dissolvedCal dissµgRussell, Ann D
19Foraminifera, planktic, sizeForam plankt sizeµmRussell, Ann DMeasured
20Foraminifera, planktic, mass per shellForam plankt massµgRussell, Ann DMeasured
21Foraminifera, planktic, wall thicknessForam plankt wallµmRussell, Ann DMeasured
22Magnesium/Calcium ratioMg/Cammol/molRussell, Ann D
23Strontium/Calcium ratioSr/Cammol/molRussell, Ann D
24Uranium/Calcium ratioU/Canmol/molRussell, Ann D
Size:
1631 data points

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