Figure 2
From: In situ response of Antarctic under-ice primary producers to experimentally altered pH
Light, temperature and productivity within the under-ice chambers. Light levels (a), sea water temperatures (b), and net photosynthetic ice-algal productivity estimates (DO fluxes; (c)), at Granite Harbour, 3–18 November 2014. (a) Photosynthetically active radiation (PAR) above (red line, left-hand axis) and below (blue line, right hand axis; average of 16 under-ice in-chamber PAR sensors) sea ice; (b) average of 16 in-chamber temperature loggers; (c) ice-algal productivity estimated from DO loggers present in each chamber (see Methods). All plots are based on 10-minutely data. Error bars on (c) are mean per treatment ± 1 SE, and are only given every four hours for the highest and lowest treatments (pH 7.99 and 7.61, respectively) for clarity.
