Seawater carbonate chemistry and calcification at Anse des Cuivres, NW Mediterranean, 2004, supplement to: Bensoussan, Nathaniel; Gattuso, Jean-Pierre (2007): Community primary production and calcification in a NW Mediterranean ecosystem dominated by calcareous macroalgae. Marine Ecology Progress Series, 334, 37-45

• Main Authors: Bensoussan, Nathaniel, Gattuso, Jean-Pierre
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2007
• Subjects: Benthos; Calcification/Dissolution; Coast and continental shelf; Entire community; Field observation; Mediterranean Sea; Rocky-shore community; South Pacific; Temperate; DATE/TIME; DEPTH, water; 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 in seawater; Bicarbonate ion; Carbonate ion; Carbon, inorganic, dissolved; Aragonite saturation state; Calcite saturation state; Calcification rate of calcium carbonate; Biology; Multi meter, WTW, LF 197; PAR sensor LI-190SA, LI-COR Inc.; Calculated using seacarb after Nisumaa et al. 2010; Automatic module for alkalinity measurement AMAM; 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; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.717852; https://doi.pangaea.de/10.1594/PANGAEA.717852

The community metabolism of a shallow infralittoral ecosystem dominated by the calcareous macroalgae Corallina elongata was investigated in Marseilles (NW Mediterranean), by monitoring hourly changes of seawater pH and total alkalinity over 6 d in February 2000. Fair weather conditions prevailed over the study period as indicated by oceanographic (temperature, salinity, and current velocity and direction) and meteorological variables, which validated the standing water hypothesis. This temperate ecosystem exhibited high community gross primary production (GPP = 519 ± 106 mmol C m-2 d-1, n = 6) and also supported high rates of community respiration (R). As a result, the system was slightly autotrophic (net community production, NCP = 20 mmol C m-2 d-1), with a GPP/R ratio of 1.06. NCP exhibited circadian variations with 2- to 3-fold changes in community respiration, both in the light and in the dark. Rates of net community calcification also exhibited circadian variations, with positive rates (up to 24 mmol CaCO3 m-2 h-1) for irradiance values >300 W m-2 (about 1380 µmol photon m-2 s-1). Below this irradiance threshold, net community dissolution prevailed. Daily net calcification (G) was on average 8 mmol CaCO3 m-2 d-1. CO2 fluxes generated by primary production, respiration, and calcification suggest that the study site was a potential atmospheric CO2 sink of 15 mmol CO2 m-2 d-1 at the time of measurement. : 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).