Figure 2.

Overview of the DMS response from all published OA mesocosm experiments carried out under natural environmental conditions, to date. Four experiments took place in early summer in Raunefjord, Norway (60.3°N, 5.2°E): (a) Avgoustidi et al. [77], (b) Vogt et al. [87], (c) Hopkins et al. [84], (d) Webb et al. [79]; two in the coastal waters of Jangmok, Korea (34.6°N, 128.5°E): one in winter (e) Kim et al. [61] and the other in early summer (f) Park et al. [86]; single experiments were carried out in (g) summer in the Svalbard Archipelago (78.9°N, 11.9°E) Archer et al. [82], (h) summer in the Baltic Sea off Finland (59.8°N, 23.2°E) Webb et al. [88], and (i) late-summer in the subtropical North Atlantic (27.9°N, 15.4°W) Archer et al. [83]. In order to compare results between experiments, the percentage changes in DMS concentrations between the pCO₂ treatments (approx. 350 : 750 µatm, shown as a percentage change on each panel) were calculated using time-integrated DMS concentrations over the duration of each experiment. See electronic supplementary material, table S2. For experiments A, B, C and D, the % response in DMS was calculated from two pCO₂ treatments (duplicate mesocosm for (a) and triplicate for (b–d)); for the remaining experiments, the % response was obtained from the linear fit between pCO₂ and DMS concentration (n = 8, pCO₂ treatments for e, f and h; n = 6 for g). (* note in (b) value not significant at 95% confidence interval [87]). (Online version in colour.)