Figure 3
From: In situ response of Antarctic under-ice primary producers to experimentally altered pH
Time series of seawater parameters in each of the four pH treatments during the 15 d experiment. Treatment means ( ± 1 SE) are given in all cases. Panels (a,b) refer to inflow and outflow pH, respectively. Panels (c) and (d) are indicative of CO2 uptake and DO production by the enclosed under-ice algal communities, respectively. Panels (e–g) show trends in environmental variables: chamber seawater temperature (e); ratio of light levels, PAR, above and below the sea ice (f); concentrations of inorganic nutrients in ambient seawater at the site (g,h). DRP = dissolved reactive phosphorus; NH4+ = ammonium nitrogen; NO3− = nitrate + nitrite nitrogen; DIN = dissolved inorganic nitrogen.
