The response of Antarctic sea ice algae to changes in pH and CO2 ...

• Main Authors: McMinn, Andrew, Müller, Marius N, Martin, Andrew, Ryan, Ken G, Swadling, Kerrie M
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: Antarctic; Bottles or small containers/Aquaria <20 L; Coast and continental shelf; Entire community; Field experiment; Growth/Morphology; Pelagos; Polar; Primary production/Photosynthesis; Species; Experiment; pH, total scale; Partial pressure of carbon dioxide water at sea surface temperature wet air; Growth rate; Growth rate, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Salinity; Temperature, water; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Carbonate ion; Carbon dioxide; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Aragonite saturation state; Calcite saturation state; Coulometric titration; Potentiometric titration; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; McMurdo Sound; Antarc*; Antarctic Krill; Antarctica; ice algae; Ocean acidification; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.836205; https://doi.pangaea.de/10.1594/PANGAEA.836205

Ocean acidification substantially alters ocean carbon chemistry and hence pH but the effects on sea ice formation and the CO2 concentration in the enclosed brine channels are unknown. Microbial communities inhabiting sea ice ecosystems currently contribute 10-50% of the annual primary production of polar seas, supporting overwintering zooplankton species, especially Antarctic krill, and seeding spring phytoplankton blooms. Ocean acidification is occurring in all surface waters but the strongest effects will be experienced in polar ecosystems with significant effects on all trophic levels. Brine algae collected from McMurdo Sound (Antarctica) sea ice was incubated in situ under various carbonate chemistry conditions. The carbon chemistry was manipulated with acid, bicarbonate and bases to produce a pCO2 and pH range from 238 to 6066 µatm and 7.19 to 8.66, respectively. Elevated pCO2 positively affected the growth rate of the brine algal community, dominated by the unique ice dinoflagellate, Polarella ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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 is 2014-09-29. ...