Table 1.

Carbonate chemistry and temperature from the experiment

Treatment	Salinity (psu)	Temperature (°C)	pH	Total alkalinity (µmol/kg−1)	pCO2 (µatm)	Ωarag
Control	34.24 ± 0.35 (0.01)	25.10 ± 1.24 (0.09)	7.99 ± 0.06 (0.01)	2,176 ± 54 (11)	447 ± 61 (13)	2.88 ± 0.34 (0.05)
Acidified	34.24 ± 0.35 (0.02)	25.12 ± 1.23 (0.09)	7.78 ± 0.07 (0.02)	2,184 ± 51 (12)	798 ± 128 (41)	1.93 ± 0.30 (0.08)
Heated	34.27 ± 0.35 (0.02)	27.05 ± 1.20 (0.16)	7.98 ± 0.06 (0.01)	2,188 ± 51 (11)	455 ± 62 (15)	3.06 ± 0.35 (0.07)
Acidified-heated	34.27 ± 0.35 (0.02)	27.11 ± 1.50 (0.15)	7.77 ± 0.07 (0.02)	2,197 ± 50 (9)	819 ± 129 (46)	2.06 ± 0.31 (0.08)

Data are daily mean values based on weekly sampling at 12:00 h as well as monthly sampling every 4 h over the diel cycle (SI Appendix) and are shown as mean ± SD. The uncertainties associated with these values reflect variation from day to day, seasonally, as well as among replicate mesocosms in each treatment. The mean uncertainty among mesocosms on a given sampling day is provided in parentheses. Note that the variation among mesocosms is relatively small, and most of the variation is explained by daily and seasonal fluctuation of these parameters.