Seawater carbonate chemistry and maximum quantum yield and relative electron transfer rate of microalgal communities in Antarctic pack ice ...

• Main Authors: Coad, Thomas, McMinn, Andrew, Nomura, Daiki, Martin, Andrew
• Format: Dataset
• Language: English
• Published: PANGAEA 2016
• Subjects: Antarctic; Bottles or small containers/Aquaria <20 L; Entire community; Laboratory experiment; Open ocean; Pelagos; Polar; Primary production/Photosynthesis; Event label; Type; Experiment; Station label; Treatment; Chlorophyll a; Maximum quantum yield of photosystem II; Maximal electron transport rate, relative; Photosynthetic quantum efficiency; Light saturation; Incubation duration; Comment; Salinity; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Carbon, inorganic, dissolved; Alkalinity, total; Temperature, water; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Austral; Antarc*; ice algae; Ocean acidification; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.933802; https://doi.pangaea.de/10.1594/PANGAEA.933802

Increased anthropogenic CO2 emissions are causing changes to oceanic pH and CO2 concentrations that will impact many marine organisms, including microalgae. Phytoplankton taxa have shown mixed responses to these changes with some doing well while others have been adversely affected. Here, the photosynthetic response of sea-ice algal communities from Antarctic pack ice (brine and infiltration microbial communities) to a range of CO2 concentrations (400 ppm to 11,000 ppm in brine algae experiments, 400 ppm to 20,000 ppm in the infiltration ice algae experiment) was investigated. Incubations were conducted as part of the Sea-Ice Physics and Ecosystem Experiment II (SIPEX-2) voyage, in the austral spring (September–November), 2012. In the brine incubations, maximum quantum yield (Fv/Fm) and relative electron transfer rate (rETRmax) were highest at ambient and 0.049% (experiment 1) and 0.19% (experiment 2) CO2 concentrations, although, Fv/Fm was consistently between 0.53±0.10–0.68±0.01 across all treatments in ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) 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). The date of carbonate chemistry calculation by seacarb is 2021-07-15. ...