Data Description

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Citation:
Keul, N et al. (2013): Seawater carbonate chemistry and benthic foraminifera Ammonia sp. uranium incorporation during experiments, 2013. doi:10.1594/PANGAEA.821210,
Supplement to: Keul, Nina; Langer, Gerald; de Nooijer, Lennart Jan; Nehrke, Gernot; Reichart, Gert-Jan; Bijma, Jelle (2013): Incorporation of uranium in benthic foraminiferal calcite reflects seawater carbonate ion concentration. Geochemistry, Geophysics, Geosystems, 14(1), 102-111, doi:10.1029/2012GC004330
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
Project(s):
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 treatment *Exp trtmKeul, Nina *
2Salinity *SalKeul, Nina *Conductivity and pH meter, pH/Cond 340i (WTW, Weilheim) *
3Temperature, water *Temp°CKeul, Nina *Conductivity and pH meter, pH/Cond 340i (WTW, Weilheim) *
4Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmKeul, Nina *Calculated using CO2SYS *Nominal
5Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmKeul, Nina *Calculated using CO2SYS *
6Carbonate ion *[CO3]2-µmol/kgKeul, Nina *Calculated using CO2SYS *
7Bicarbonate ion *[HCO3]-µmol/kgKeul, Nina *Calculated using CO2SYS *
8Carbon, inorganic, dissolved *DICµmol/kgKeul, Nina *Photometrically using autoanalyzer QUAATRO *
9Alkalinity, total *ATµmol/kgKeul, Nina *Calculated using CO2SYS *
10pH *pHKeul, Nina *Conductivity and pH meter, pH/Cond 340i (WTW, Weilheim) *Total scale
11Calcite saturation state *Omega CalKeul, Nina *Calculated using CO2SYS *
12Uranium/Calcium ratio *U/Caµmol/molKeul, Nina *Calculated, see reference(s) *Seawater
13Uranium/Calcium ratio *U/Caµmol/molKeul, Nina *Calculated, see reference(s) *Calcite
14Coefficient *CoeffKeul, Nina *Calculated, see reference(s) *Calculated partition coefficient DU = (U/Ca)calcite/(U/Ca)seawater
15Carbonate system computation flag *CSC flagNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
16Carbon dioxide *CO2µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
17Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
18Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
19Bicarbonate ion *[HCO3]-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
20Carbonate ion *[CO3]2-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
21Alkalinity, total *ATµmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
22Aragonite saturation state *Omega ArgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
23Calcite saturation state *Omega CalNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
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184 data points

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