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Keul, Nina; Langer, Gerald; de Nooijer, Lennart Jan; Nehrke, Gernot; Reichart, Gert-Jan; Bijma, Jelle (2013): Seawater carbonate chemistry and benthic foraminifera Ammonia sp. uranium incorporation during experiments, 2013. doi:10.1594/PANGAEA.821210,
Supplement to: Keul, N et al. (2013): Incorporation of uranium in benthic foraminiferal calcite reflects seawater carbonate ion concentration. Geochemistry, Geophysics, Geosystems, 14(1), 102-111, doi:10.1029/2012GC004330

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Abstract:
The chemical and isotopic composition of foraminiferal shells (so-called proxies) reflects the physico-chemical properties of the seawater. In current day paleoclimate research, the reconstruction of past seawater carbonate system to infer atmospheric CO2 concentrations is one of the most pressing challenges and a variety of proxies have been investigated, such as foraminiferal U/Ca. Since in natural seawater and traditional CO2 perturbation experiments, the carbonate system parameters co-vary, it is not possible to determine the parameter of the carbonate system causing e.g. changes in U/Ca, complicating the use of the latter as a carbonate system proxy. We overcome this problem, by culturing the benthic foraminifer Ammonia sp. at a range of carbonate chemistry manipulation treatments. Shell U/Ca values were determined to test sensitivity of U incorporation to various parameters of the carbonate system. We argue that CO3 is the parameter affecting the U/Ca ratio and consequently, the partitioning coefficient for U in Ammonia sp DU. We can confirm the strong potential of foraminiferal U/Ca as a CO3 proxy.
Related to:
Keul, Nina; Langer, Gerald; de Nooijer, Lennart Jan; Bijma, Jelle (2013): Seawater carbonate chemistry and benthic foraminifera Ammonia sp. mass, size, and growth rate during experiments, 2013. doi:10.1594/PANGAEA.821209
Coverage:
Latitude: 53.701400 * Longitude: 8.479000
Date/Time Start: 2011-01-01T00:00:00 * Date/Time End: 2011-05-01T00:00:00
Event(s):
Keul-2011-Ammonia * Latitude: 53.701400 * Longitude: 8.479000 * Date/Time Start: 2011-01-01T00:00:00 * Date/Time End: 2011-05-01T00:00:00 * Location: Wadden Sea * Device: Biological sample (BIOS)
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
1Experimental treatmentExp trtmKeul, Nina
2SalinitySalKeul, NinaConductivity and pH meter, pH/Cond 340i (WTW, Weilheim)
3Temperature, waterTemp°CKeul, NinaConductivity and pH meter, pH/Cond 340i (WTW, Weilheim)
4Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmKeul, NinaCalculated using CO2SYSNominal
5Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmKeul, NinaCalculated using CO2SYS
6Carbonate ion[CO3]2-µmol/kgKeul, NinaCalculated using CO2SYS
7Bicarbonate ion[HCO3]-µmol/kgKeul, NinaCalculated using CO2SYS
8Carbon, inorganic, dissolvedDICµmol/kgKeul, NinaPhotometrically using autoanalyzer QUAATRO
9Alkalinity, totalATµmol/kgKeul, NinaCalculated using CO2SYS
10pHpHKeul, NinaConductivity and pH meter, pH/Cond 340i (WTW, Weilheim)Total scale
11Calcite saturation stateOmega CalKeul, NinaCalculated using CO2SYS
12Uranium/Calcium ratioU/Caµmol/molKeul, NinaCalculated, see reference(s)Seawater
13Uranium/Calcium ratioU/Caµmol/molKeul, NinaCalculated, see reference(s)Calcite
14CoefficientCoeffKeul, NinaCalculated, see reference(s)Calculated partition coefficient DU = (U/Ca)calcite/(U/Ca)seawater
15Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
17Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
19Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
20Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
21Alkalinity, totalATµmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
22Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
23Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
Size:
184 data points

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