Table 3. Seawater carbonate chemistry of the chamber experiments with dissolved inorganic carbon (DIC) and total alkalinity (A T) measured from water samples fixed with saturated mercuric chloride solution (HgCl2).
Expedition | Treatment | pHT | Temperature (°C) | AT (μmol kg−1) | DIC (μmol kg−1) | pCO2 (μatm) | HCO3− (μmol kg−1) | CO32− (μmol kg−1) | CO2(>aq) (μmol kg−1) | ΩCA | ΩAR |
---|---|---|---|---|---|---|---|---|---|---|---|
1 | control | 8.05 | 28.0 | 2206 | 1887 | 381 | 1652 | 225 | 9.7 | 5.54 | 3.69 |
1 | elevated-CO2 | 7.70 | 28.0 | 2282 | 2135 | 1028 | 1987 | 121 | 26.3 | 2.97 | 1.98 |
2 | control | 8.08 | 29.5 | 2270 | 1938 | 359 | 1693 | 236 | 9.5 | 5.78 | 3.84 |
2 | elevated-CO2 | 7.75 | 29.5 | 2336 | 2171 | 906 | 2015 | 132 | 24.0 | 3.25 | 2.15 |
DIC and AT were inputted into the Excel macro CO2SYS and used to calculate pH at total scale (pHT), partial pressure of carbon dioxide (pCO2), bicarbonate (HCO3−), carbonate (CO32−), aqueous carbon dioxide (CO2(aq)), the saturation state of calcite (ΩCA), and the saturation state of aragonite (ΩAR).