Shore-based Total Alkalinity Analyses

To determine the Total Alkalinity concentration in seawater, 539 samples were titrated. Typically, 28 of the 36 samples from Niskin bottles collected on a station were analyzed during the cruise. The TALK was measured on aliquot of seawater taken from the same 500-mL bottle previously analyzed for TCO₂. Duplicate samples were collected on six stations and analyzed for TALK. The closed- cell potentiometric acid titration system was used to determine TALK concentration. The system was designed and constructed at SIO by David Moss with the developmental and experimental assistance of Timothy Lueker. A full description of TALK measurements is provided in Guenther et al. (1994a).