Data Description

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Citation:
Taddei, D et al. (2007): Seawater carbonate chemistry and community calcification during Reunion Island coral reef community study, 2007. doi:10.1594/PANGAEA.721964,
Supplement to: Taddei, Dorothée; Bucas, G; Clavier, Jacques; Cuet, Pascale; Frouin, P (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
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.
Project(s):
Coverage:
Date/Time Start: 2003-09-20T12:29:00 * Date/Time End: 2004-08-10T17:27:00
Event(s):
Taddei_etal_07 * * 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).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DATE/TIME *Date/TimeGeocode
2Sample ID *Sample IDTaddei, Dorothée *
3Salinity *SalTaddei, Dorothée *YSI 6920 salinity/conductivity/temperature meter *
4Temperature, water *Temp°CTaddei, Dorothée *YSI 6920 salinity/conductivity/temperature meter *
5Radiation, photosynthetically active *PARµE/m2/sTaddei, Dorothée *PAR sensor LI-1400, LI-COR Inc. *
6Carbonate system computation flag *CSC flagNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
7pH *pHTaddei, Dorothée *pH, Electrode *
8Alkalinity, total *ATmmol(eq)/lTaddei, Dorothée *Alkalinity, potentiometric *
9Alkalinity, total *ATµmol/kgTaddei, Dorothée *Calculated *Original data in µEq/l, calculated using density
10Carbon, inorganic, dissolved *DICµmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
11Carbon dioxide *CO2µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
12Carbonate ion *[CO3]2-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
13Bicarbonate ion *[HCO3]-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
14Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
15Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
16Aragonite saturation state *Omega ArgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
17Calcite saturation state *Omega CalNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
18Calcification rate of calcium carbonate *Calc rate CaCO3mmol/m2/hTaddei, Dorothée *Alkalinity anomaly technique (Smith and Key, 1975) *
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1292 data points

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