Seawater carbonate chemistry and calcification during tropical reef studies at Younge reef (Great Barrier Reef), 1996, supplement to: Gattuso, Jean-Pierre; Pichon, Michel; Delesalle, Bruno; Canon, C; Frankignoulle, Michel (1996): Carbon fluxes in coral reefs. I. Lagrangian measurement of community metabolism and resulting air-sea CO2 disequilibrium. Marine Ecology Progress Series, 145, 109-121

• Main Authors: Gattuso, Jean-Pierre, Pichon, Michel, Delesalle, Bruno, Canon, C, Frankignoulle, Michel
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 1996
• Subjects: Benthos; Calcification/Dissolution; Coast and continental shelf; Entire community; Field observation; Soft-bottom community; South Pacific; Tropical; DATE/TIME; Salinity; Temperature, water; Radiation, photosynthetically active; Carbonate system computation flag; pH; Alkalinity, total; Carbon dioxide; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Carbon, inorganic, dissolved; Aragonite saturation state; Calcite saturation state; Calcification rate of calcium carbonate; Experiment; Thermistor; LICOR quantameter LI-COR LI-192SA; Calculated using seacarb after Nisumaa et al. 2010; pH, Electrode; Titration potentiometric Metler-Toledo; Calculated; Alkalinity anomaly technique Smith and Key, 1975; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Austral; Pacific; Toledo; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.717551; https://doi.pangaea.de/10.1594/PANGAEA.717551

Community metabolism was investigated using a Lagrangian flow respirometry technique on 2 reef flats at Moorea (French Polynesia) during austral winter and Yonge Reef (Great Barrier Reef) during austral summer. The data were used to estimate related air-sea CO2 disequilibrium. A sine function did not satisfactorily model the diel light curves and overestimated the metabolic parameters. The ranges of community gross primary production and respiration (Pg and R; 9 to 15 g C m-2 d-1) were within the range previously reported for reef flats, and community net calcification (G; 19 to 25 g CaCO3 m-2 d-1) was higher than the 'standard' range. The molar ratio of organic to inorganic carbon uptake was 6:1 for both sites. The reef flat at Moorea displayed a higher rate of organic production and a lower rate of calcification compared to previous measurements carried out during austral summer. The approximate uncertainty of the daily metabolic parameters was estimated using a procedure based on a Monte Carlo simulation. The standard errors of Pg,R and Pg/R expressed as a percentage of the mean are lower than 3% but are comparatively larger for E, the excess production (6 to 78%). The daily air-sea CO2 flux (FCO2) was positive throughout the field experiments, indicating that the reef flats at Moorea and Yonge Reef released CO2 to the atmosphere at the time of measurement. FCO2 decreased as a function of increasing daily irradiance. : 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).