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Yamamoto, Shoji; Kayanne, Hajime; Terai, Makoto; Watanabe, Atsushi; Kato, Ken; Negishi, Akira; Nozaki, Ken (2012): Seawater carbonate chemistry and net dissolution rate for experiment of Shiraho reef. PANGAEA, https://doi.org/10.1594/PANGAEA.820200, Supplement to: Yamamoto, S et al. (2012): Threshold of carbonate saturation state determined by CO2 control experiment. Biogeosciences, 9(4), 1441-1450, https://doi.org/10.5194/bg-9-1441-2012

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Abstract:
Acidification of the oceans by increasing anthropogenic CO2 emissions will cause a decrease in biogenic calcification and an increase in carbonate dissolution. Previous studies have suggested that carbonate dissolution will occur in polar regions and in the deep sea where saturation state with respect to carbonate minerals (Omega) will be <1 by 2100. Recent reports demonstrate nocturnal carbonate dissolution of reefs, despite a Omega a (aragonite saturation state) value of >1. This is probably related to the dissolution of reef carbonate (Mg-calcite), which is more soluble than aragonite. However, the threshold of Omega for the dissolution of natural sediments has not been clearly determined. We designed an experimental dissolution system with conditions mimicking those of a natural coral reef, and measured the dissolution rates of aragonite in corals, and of Mg-calcite excreted by other marine organisms, under conditions of Omega a > 1, with controlled seawater pCO2. The experimental data show that dissolution of bulk carbonate sediments sampled from a coral reef occurs at Omega a values of 3.7 to 3.8. Mg-calcite derived from foraminifera and coralline algae dissolves at Omega a values between 3.0 and 3.2, and coralline aragonite starts to dissolve when Omega a = 1.0. We show that nocturnal carbonate dissolution of coral reefs occurs mainly by the dissolution of foraminiferans and coralline algae in reef sediments.
Keyword(s):
Benthos; Bottles or small containers/Aquaria ( 20 L); Calcification/Dissolution; Coast and continental shelf; Entire community; Laboratory experiment; North Pacific; Rocky-shore community; Temperate
Further details:
Lavigne, Héloise; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4. https://cran.r-project.org/package=seacarb
Coverage:
Latitude: 24.367000 * Longitude: 124.250000
Event(s):
Shirahoreef * Latitude: 24.367000 * Longitude: 124.250000 * Device: Experiment (EXP)
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). The date of carbonate chemistry calculation by seacarb is 2013-10-13.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1TreatmentTreatYamamoto, Shoji
2Carbon dioxide, partial pressurepCO2ppmvYamamoto, ShojiInfrared gas analyzer (NDIR)
3Sample massSamp mgYamamoto, Shoji
4DurationDurationhYamamoto, Shoji
5Temperature, waterTemp°CYamamoto, Shoji
6SalinitySalYamamoto, Shoji
7Alkalinity, totalATµmol/kgYamamoto, ShojiPotentiometric titration
8Alkalinity, totalATµmol/kgYamamoto, ShojiStandardized to a constant salinity
9Carbon, inorganic, dissolvedDICµmol/kgYamamoto, ShojiCalculated using CO2SYS
10Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYamamoto, ShojiCalculated using CO2SYS
11Aragonite saturation stateOmega ArgYamamoto, ShojiCalculated using CO2SYS
12Water volumeWater volkgYamamoto, Shoji
13Dissolution rateDiss rate%/hYamamoto, Shoji
14Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
15pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)Total scale
16Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
17Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
18Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
19Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
20Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
21Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
22Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
4606 data points

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