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Dissard, Delphine; Nehrke, Gernot; Reichart, Gert-Jan; Bijma, Jelle (2010): Seawater carbonate chemistry and processes during experiments with benthic foraminifera Ammonia tepida. PANGAEA, https://doi.org/10.1594/PANGAEA.733910, Supplement to: Dissard, D et al. (2010): Impact of seawater pCO2 on calcification and Mg/Ca and Sr/Ca ratios in benthic foraminifera calcite: results from culturing experiments with Ammonia tepida. Biogeosciences, 7(1), 81-93, https://doi.org/10.5194/bg-7-81-2010

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Abstract:
Evidence of increasing concentrations of dissolved carbon dioxide, especially in the surface ocean and its associated impacts on calcifying organisms, is accumulating. Among these organisms, benthic and planktonic foraminifera are responsible for a large amount of the globally precipitated calcium carbonate. Hence, their response to an acidifying ocean may have important consequences for future inorganic carbon cycling. To assess the sensitivity of benthic foraminifera to changing carbon dioxide levels and subsequent alteration in seawater carbonate chemistry, we cultured specimens of the shallow water species Ammonia tepida at two concentrations of atmospheric CO2 (230 and 1900 ppmv) and two temperatures (10 °C and 15 °C). Shell weights and elemental compositions were determined. Impact of high and low pCO2 on elemental composition are compared with results of a previous experiment were specimens were grown under ambient conditions (380 ppvm, no shell weight measurements of specimen grown under ambient conditions are, however, available). Results indicate that shell weights decrease with decreasing [CO3], although calcification was observed even in the presence of calcium carbonate under-saturation, and also decrease with increasing temperature. Thus both warming and ocean acidification may act to decrease shell weights in the future. Changes in [CO3] or total dissolved inorganic carbon do not affect the Mg distribution coefficient. On the contrary, Sr incorporation is enhanced under increasing [CO3]. Implications of these results for the paleoceanographic application of foraminifera are discussed.
Keyword(s):
Ammonia tepida; Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Chromista; Coast and continental shelf; Foraminifera; Heterotrophic prokaryotes; Laboratory experiment; North Atlantic; Single species; Temperate; Temperature
Funding:
Seventh Framework Programme (FP7), grant/award no. 211384: European Project on Ocean Acidification
Sixth Framework Programme (FP6), grant/award no. 511106: European network of excellence for Ocean Ecosystems Analysis
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 InvestigatorMethod/DeviceComment
1Experimental treatmentExp treatDissard, DelphineLS- low salinity, LT- low temperature, HS- high salinity, HT- high temperature
2SalinitySalDissard, Delphine
3Temperature, waterTemp°CDissard, Delphine
4Carbonate system computation flagCSC flagDissard, Delphine
5Alkalinity, totalATµmol/kgDissard, DelphineAlkalinity, Gran titration (Gran, 1950)
6Carbon, inorganic, dissolvedDICµmol/kgDissard, DelphineTitration potentiometric
7pHpHDissard, DelphinepH meter (WYTW 3000)NBS scale
8pHpHDissard, DelphineCalculated using CO2SYSNBS scale
9pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
10Bicarbonate ion[HCO3]-µmol/kgDissard, DelphineCalculated using CO2SYS
11Carbonate ion[CO3]2-µmol/kgDissard, DelphineCalculated using CO2SYS
12Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmDissard, DelphineCalculated using CO2SYS
13Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
14Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
15Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
17Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
19Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
20Ammonia tepidaA. tepidaDissard, DelphineMicroscopyStart
21Ammonia tepidaA. tepidaDissard, DelphineMicroscopyPresenting new chambers
22MagnesiumMg2+mg/kgDissard, Delphine
23StrontiumSrmg/kgDissard, Delphine
24CalciumCa2+mg/kgDissard, Delphine
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
192 data points

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