Seawater carbonate chemistry and algal abundance, growth and flourometry data of a late summer suface sea ice community ...

• Main Authors: McMinn, Andrew, Müller, Marius N, Martin, Andrew, Ugalde, Sarah C, Lee, Shihong, Castrisios, Katerina, Ryan, Ken G
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: Antarctic; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Coast and continental shelf; Entire community; Field experiment; Growth/Morphology; Pelagos; Polar; Primary production/Photosynthesis; Type; Experiment duration; Experiment; pH; Carbon dioxide; Biovolume; Cell biovolume, standard deviation; Number of cells; Cell counts, standard deviation; Chlorophyll a; Chlorophyll a, standard deviation; Growth rate; Growth rate, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Maximal electron transport rate, relative; Maximal electron transport rate, relative, standard deviation; Index; Salinity; Temperature, water; Silicate; Phosphate; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Carbonate ion; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Aragonite saturation state; Calcite saturation state; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Scott Base; Antarc*; Antarctica; Ocean acidification; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.875707; https://doi.pangaea.de/10.1594/PANGAEA.875707

Annual fast ice at Scott Base (Antarctica) in late summer contained a high biomass surface community of mixed phytoflagellates, dominated by the dinoflagellate, Polarella glacialis. At this time of the year, ice temperatures rise close to melting point and salinities drop to less than 20. At the same time, pH levels can rise above 9 and nutrients can become limiting. In January 2014, the sea ice microbial community from the top 30 cm of the ice was exposed to a gradient of pH and CO2 (5 treatments) that ranged from 8.87 to 7.12 and 5-215 µmol CO2 kg?1, respectively, and incubated in situ. While growth rates were reduced at the highest and lowest pH, the differences were not significant. Likewise, there were no significant differences in maximum quantum yield of PSII (Fv/Fm) or relative maximum electron transfer rates (rETRmax) among treatments. In a parallel experiment, a CO2 gradient of 26-230 µmol CO2 kg?1 (5 treatments) was tested, keeping pH constant. In this experiment, growth rates increased by ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 2017-05-26. ...