Taddei, Dorothée; Bucas, G; Clavier, Jacques; Cuet, Pascale; Frouin, P (2007): Seawater carbonate chemistry and community calcification during Reunion Island coral reef community study, 2007. doi:10.1594/PANGAEA.721964, Supplement to: Taddei, D et al. (2007): Carbon fluxes at the water-sediment interface in Reunion Island fringing reef. Western Indian Ocean Journal of Marine Science, 6(2), 137-146, hdl:10013/epic.35511.d001
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Abstract:
To assess the contribution of soft-bottoms to the carbon cycle in coral reefs, the net community production (p) was measured in winter at 3 stations on La Saline inner reef flat (Reunion Island). Changes in pH and total alkalinity at different irradiances (I) were assessed using benthic chambers (0.2 m2) during a 1-h incubation. Mean grain size, the silt and clay load and chlorophyll a content of the sediments were analysed in each chamber. Daily community production (P), gross community production (Pg) and community respiration (R) were estimated from p-I curves and daily irradiance variations (PAR, 400-700 nm). Sediment characteristics and chlorophyll a contents did not differ between the three sites, except for the silt and clay fraction at one station. R being higher than Pg (84.88 ± 7.36 and -62.29 ± 3.34 mmolC m-2 d-1 respectively), P value reached 22.59 ± 5.66 mmolC m-2 d-1. The sediments were therefore heterotrophic with a mean Pg/R lower than 1 (0.74 ± 0.05) and appear to be a carbon source. Our data suggested the importance of the degradation process in the functioning of near-reef sediments.
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Date/Time Start: 2003-09-20T12:29:00 * Date/Time End: 2004-08-10T17:27:00
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):
| # | Name | Short Name | Unit | Principal Investigator | Method | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Geocode | |||
| 2 | Sample ID | Sample ID | Taddei, Dorothée | |||
| 3 | Salinity | Sal | Taddei, Dorothée | YSI 6920 salinity/conductivity/temperature meter | ||
| 4 | Temperature, water | Temp | °C | Taddei, Dorothée | YSI 6920 salinity/conductivity/temperature meter | |
| 5 | Radiation, photosynthetically active | PAR | µE/m2/s | Taddei, Dorothée | PAR sensor LI-1400, LI-COR Inc. | |
| 6 | Carbonate system computation flag | CSC flag | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | ||
| 7 | pH | pH | Taddei, Dorothée | pH, Electrode | ||
| 8 | Alkalinity, total | AT | mmol(eq)/l | Taddei, Dorothée | Alkalinity, potentiometric | |
| 9 | Alkalinity, total | AT | µmol/kg | Taddei, Dorothée | Calculated | Original data in µEq/l, calculated using density |
| 10 | Carbon, inorganic, dissolved | DIC | µmol/kg | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | |
| 11 | Carbon dioxide | CO2 | µmol/kg | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | |
| 12 | Carbonate ion | [CO3]2- | µmol/kg | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | |
| 13 | Bicarbonate ion | [HCO3]- | µmol/kg | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | |
| 14 | Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) | pCO2water_SST_wet | µatm | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | |
| 15 | Fugacity of carbon dioxide (water) at sea surface temperature (wet air) | fCO2water_SST_wet | µatm | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | |
| 16 | Aragonite saturation state | Omega Arg | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | ||
| 17 | Calcite saturation state | Omega Cal | Nisumaa, Anne-Marin | Calculated using seacarb after Nisumaa et al. (2010) | ||
| 18 | Calcification rate of calcium carbonate | Calc rate CaCO3 | mmol/m2/h | Taddei, Dorothée | Alkalinity anomaly technique (Smith and Key, 1975) |
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