Seawater carbonate chemistry, calcification and photosynthesis during experiments with corals, 2005, supplement to: Langdon, Chris; Atkinson, M J (2005): Effect of elevated pCO2 on photosynthesis and calcification of corals and interactions with seasonal change in temperature/irradiance and nutrient enrichment. Journal of Geophysical Research: Oceans, 110, C09S07

• Main Authors: Langdon, Chris, Atkinson, M J
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2005
• Subjects: Benthos; Calcification/Dissolution; Coast and continental shelf; Entire community; Laboratory experiment; Light; Mesocosm or benthocosm; North Pacific; Primary production/Photosynthesis; Rocky-shore community; Single species; Temperature; Tropical; Event label; Experimental treatment; Carbonate system computation flag; Temperature, water; Salinity; Radiation, photosynthetically active; Oxygen; pH; Alkalinity, total; Carbon, inorganic, dissolved; Carbon dioxide; Bicarbonate ion; Carbonate ion; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Aragonite saturation state; Calcite saturation state; Calcification rate of calcium carbonate; Net community production of carbon; Integrated net community production of oxygen; Experiment; Calculated using seacarb after Nisumaa et al. 2010; Calculated using CO2SYS; Alkalinity, Gran titration Gran, 1950; Coulometric titration; Alkalinity anomaly technique Smith and Key, 1975; Calculated; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Atkinson; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.721194; https://doi.pangaea.de/10.1594/PANGAEA.721194

An investigation was conducted to determine the effects of elevated pCO2 on the net production and calcification of an assemblage of corals maintained under near-natural conditions of temperature, light, nutrient, and flow. Experiments were performed in summer and winter to explore possible interactions between seasonal change in temperature and irradiance and the effect of elevated pCO2. Particular attention was paid to interactions between net production and calcification because these two processes are thought to compete for the same internal supply of dissolved inorganic carbon (DIC). A nutrient enrichment experiment was performed because it has been shown to induce a competitive interaction between photosynthesis and calcification that may serve as an analog to the effect of elevated pCO2. Net carbon production, NPC, increased with increased pCO2 at the rate of 3 ± 2% (?mol CO2aq kg?1)?1. Seasonal change of the slope NPC-[CO2aq] relationship was not significant. Calcification (G) was strongly related to the aragonite saturation state ? a . Seasonal change of the G-? a relationship was not significant. The first-order saturation state model gave a good fit to the pooled summer and winter data: G = (8 ± 1 mmol CaCO3 m?2 h?1)(? a ? 1), r 2 = 0.87, P = 0.0001. Both nutrient and CO2 enrichment resulted in an increase in NPC and a decrease in G, giving support to the hypothesis that the cellular mechanism underlying the decrease in calcification in response to increased pCO2 could be competition between photosynthesis and calcification for a limited supply of DIC. : 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).