Over-determined charbonate chemstry dataset from different kinds of manipulation (TA, DIC) and water types (natural and artificial seawater) ...

• Main Authors: Hoppe, Clara Jule Marie, Langer, Gerald, Rokitta, Sebastian D, Wolf-Gladrow, Dieter A, Rost, Björn
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: MedSeA; Type; Method comment; Salinity; Temperature, water; Phosphate; Silicate; Alkalinity, total; Carbon dioxide; pH; European Project on Ocean Acidification EPOCA; Mediterranean Sea Acidification in a Changing Climate MedSeA; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.806969; https://doi.pangaea.de/10.1594/PANGAEA.806969

The growing field of ocean acidification research is concerned with the investigation of organism responses to increasing pCO2 values. One important approach in this context is culture work using seawater with adjusted CO2 levels. As aqueous pCO2 is difficult to measure directly in small-scale experiments, it is generally calculated from two other measured parameters of the carbonate system (often AT, CT or pH). Unfortunately, the overall uncertainties of measured and subsequently calculated values are often unknown. Especially under high pCO2, this can become a severe problem with respect to the interpretation of physiological and ecological data. In the few datasets from ocean acidification research where all three of these parameters were measured, pCO2 values calculated from AT and CT are typically about 30% lower (i.e. ~300 µatm at a target pCO2 of 1000 µatm) than those calculated from AT and pH or CT and pH. This study presents and discusses these discrepancies as well as likely consequences for the ... : Supplement to: Hoppe, Clara Jule Marie; Langer, Gerald; Rokitta, Sebastian D; Wolf-Gladrow, Dieter A; Rost, Björn (2012): Implications of observed inconsistencies in carbonate chemistry measurements for ocean acidification studies. Biogeosciences, 9, 2401-2405 ...