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Heiden, Jasmin; Thoms, Silke; Bischof, Kai; Trimborn, Scarlett (2018): Seawater carbonate chemistry and particulate organic carbon accumulation of two Antarctic diatom species. PANGAEA,, Supplement to: Heiden, J et al. (2018): Ocean acidification stimulates particulate organic carbon accumulation in two Antarctic diatom species under moderate and high natural solar radiation. Journal of Phycology,

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Impacts of rising atmospheric CO2 concentrations and increased daily irradiances from enhanced surface water stratification on phytoplankton physiology in the coastal Southern Ocean remain still unclear. Therefore, in the two Antarctic diatoms Fragilariopsis curta and Odontella weissflogii the effects of moderate and high natural solar radiation combined with either ambient or future pCO2 on cellular particulate organic carbon (POC) contents and photophysiology were investigated. Results showed that increasing CO2 concentrations had greater impacts on diatom physiology than exposure to increasing solar radiation. Irrespective of the applied solar radiation regime, cellular POC quotas increased with future pCO2 in both diatoms. Lowered maximum quantum yields of photochemistry in PSII (Fv/Fm) indicated a higher photosensitivity under these conditions, being counteracted by increased cellular concentrations of functional photosynthetic reaction centers. Overall, our results suggest that both bloom‐forming Antarctic coastal diatoms might increase carbon contents under future pCO2 conditions despite reduced physiological fitness. This indicates a higher potential for primary productivity by the two diatom species with important implications for the CO2 sequestration potential of diatom communities in the future coastal Southern Ocean.
Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria ( 20 L); Chromista; Coast and continental shelf; Fragilariopsis curta; Laboratory experiment; Light; Not applicable; Ochrophyta; Odontella weissflogii; Pelagos; Phytoplankton; Polar; Primary production/Photosynthesis; Single species
Further details:
Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloise; Orr, James C; Gentili, Bernard; Proye, Aurélien; Soetaert, Karline; Rae, James (2016): seacarb: seawater carbonate chemistry with R. R package version 3.1.
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 by seacarb is 2018-08-03.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1TypeTypeTrimborn, Scarlettstudy
2SpeciesSpeciesTrimborn, Scarlett
3Registration number of speciesReg spec noTrimborn, Scarlett
4Uniform resource locator/link to referenceURL refTrimborn, ScarlettWoRMS Aphia ID
5TreatmentTreatTrimborn, ScarlettIrradiance
6TreatmentTreatTrimborn, ScarlettCO2 level
7Carbon, organic, particulate, per cellPOCpg/#Trimborn, Scarlett
8Carbon, organic, particulate, standard deviationPOC std dev±Trimborn, Scarlett
9Nitrogen, organic, particulate, per cellPONpg/#Trimborn, Scarlett
10Nitrogen, organic, particulate, standard deviationPON std dev±Trimborn, Scarlett
11Carbon/Nitrogen ratioC/NTrimborn, Scarlett
12Carbon/Nitrogen ratio, standard deviationC/N std dev±Trimborn, Scarlett
13Maximum photochemical quantum yield of photosystem IIFv/FmTrimborn, Scarlettmeasured
14Maximum photochemical quantum yield of photosystem II, standard deviationFv/Fm std dev±Trimborn, Scarlett
15Maximum photochemical quantum yield of photosystem IIFv/FmTrimborn, Scarlettcalculated
16SalinitySalTrimborn, Scarlett
17Temperature, waterTemp°CTrimborn, Scarlett
18Temperature, water, standard deviationTemp std dev±Trimborn, Scarlett
19SilicateSi(OH)4µmol/lTrimborn, Scarlett
20Phosphate[PO4]3-µmol/lTrimborn, Scarlett
21Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmTrimborn, Scarlett
22Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Trimborn, Scarlett
23Alkalinity, totalATµmol/kgTrimborn, Scarlett
24Alkalinity, total, standard deviationAT std dev±Trimborn, Scarlett
25pHpHTrimborn, ScarlettNBS scale
26pH, standard deviationpH std dev±Trimborn, ScarlettNBS scale
27Carbon, inorganic, dissolvedDICµmol/kgTrimborn, Scarlett
28Carbon, inorganic, dissolved, standard deviationDIC std dev±Trimborn, Scarlett
29Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
30pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
31Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
32Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
33Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
34Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
35Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
36Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
37Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
38Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
304 data points

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