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Kranz, Sven A; Wolf-Gladrow, Dieter A; Nehrke, Gernot; Langer, Gerald; Rost, Bjoern (2010): Seawater carbonate chemistry, chlorophyll a and phosphate during experiments with Trichodesmium erythraeum IMS101 (CCMP1985), 2010. doi:10.1594/PANGAEA.777419,
Supplement to: Kranz, SA et al. (2010): Calcium carbonate precipitation induced by the growth of the marine cyanobacteria Trichodesmium. Limnology and Oceanography, 55(6), 2563-2569, doi:10.4319/lo.2010.55.6.2563

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Abstract:
In this laboratory study, we monitored the buildup of biomass and concomitant shift in seawater carbonate chemistry over the course of a Trichodesmium bloom under different phosphorus (P) availability. During exponential growth, dissolved inorganic carbon (DIC) decreased, while pH increased until maximum cell densities were reached. Once P became depleted, DIC decreased even further and total alkalinity (TA) dropped, accompanied by precipitation of aragonite. Under P-replete conditions, DIC increased and TA remained constant in the postbloom phase. A diffusion-reaction model was employed to estimate changes in carbonate chemistry of the diffusive boundary layer. This study demonstrates that Trichodesmium can induce precipitation of aragonite from seawater and further provides possible explanations about underlying mechanisms.
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 trtmKranz, Sven A
2CommentCommentKranz, Sven A
3Experiment dayExp daydayKranz, Sven A
4Light:Dark cycleL:Dhh:hhKranz, Sven AMeasured
5Radiation, photosynthetically activePARµE/m2/sKranz, Sven A
6SalinitySalKranz, Sven AConductivity meter (WTW, Weilheim, Gemany)
7Temperature, waterTemp°CKranz, Sven A
8SpeciesSpeciesKranz, Sven A
9Chlorophyll aChl aµg/lKranz, Sven Asee reference(s)
10PhosphatePO4µmol/lKranz, Sven A
11Carbon, inorganic, dissolvedDICµmol/kgKranz, Sven AAuto-analyzer, Technicon Traacs 800
12pHpHKranz, Sven ACalculated using CO2SYSTotal scale
13Alkalinity, totalATµmol/kgKranz, Sven AAlkalinity, Gran titration (Gran, 1950)
14Aragonite saturation stateOmega ArgKranz, Sven ACalculated using CO2SYS
15Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
17Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
19Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
20Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
21Carbonate ion[CO3]2-µmol/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:
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