Time series of Netarts Bay carbonate chemistry during Cohort 3 and 4 experiments in 2015. Blue lines indicate high-frequency, high-resolution monitoring data collected immediately after Whiskey Creek Hatchery seawater intake. Top panel represents Ω_Ar; middle panel, PCO₂; and bottom panel, pH. Red dots represent discrete seawater samples from unbuffered, randomly selected culture chambers; green dots represent discrete seawater samples from buffered, randomly selected culture chambers. The few buffered samples that have unusually low Ω_Ar and pH and high PCO₂ could be the result of sample mishandling or a transient failure of the buffering system. DOI: https://doi.org/10.1525/elementa.306.f2