Table 2.
Measured and estimated environmental and geochemical variables for pH zones
| Parameter | Ambient | Low | Extreme low | N |
| North | ||||
| Salinity(‰) | 37.9± 0.3 | 37.8±0.4 | 37.9± 0.4 | 3 |
| TA (μmol/kg) | 2,563± 3 | 2,560± 7 | 2,559± 13 | 3 |
| DIC (μmol/kg) | 1,768± 96 | 2,395± 66 | 2,579± 207 | 3 |
| Temperature (°C) | 23.4± 0.7 | 23.8± 0.7 | 23.4± 0.74 | 604 |
| pH (total) | 8.0± 0.1 | 7.8± 0.2 | 7.2± 0.4 | 604 |
| pCO2 (μatm) | 567 ± 100 | 1,075 ± 943 | 6,558 ± 21,347 | 604 |
| Ωaragonite | 3.13 ± 0.35 | 2.32 ± 0.73 | 0.84 ± 0.54 | 604 |
| Ωcalcite | 4.75 ± 0.53 | 3.52 ± 1.11 | 1.27 ± 0.82 | 604 |
| South | ||||
| Salinity(‰) | 37.6± 0.3 | 37.7± 0.2 | 37.7± 0.2 | 4–10 |
| TA (μmol/kg) | 2,563± 2 | 2,560± 7 | 2,563± 13 | 4–10 |
| DIC (μmol/kg) | 2,281± 73 | 2,318± 99 | 3,849± 790 | 4–10 |
| Temperature (°C) | 19.6± 1.5 | 17.5± 2.8 | 17.5± 2.8 | 1,503–3,162 |
| pH (total) | 8.1± 0.1 | 7.8± 0.3 | 6.6± 0.5 | 1,503–3,162 |
| pCO2 (μatm) | 440 ± 192 | 1,581 ± 2,711 | 23,989 ± 16,638 | 1,503–3,162 |
| Ωaragonite | 3.33 ± 0.44 | 1.95 ± 0.85 | 0.32 ± 0.62 | 1,503–3,162 |
| Ωcalcite | 5.11 ± 0.67 | 3.00 ± 1.31 | 0.49 ± 0.96 | 1,503–3,162 |
Values are means (± SD). Parameters in bold were measured from discrete water samples. Parameters in italics were measured with in situ sensors. The values from in situ sensors represent the means of hourly measurements from multiple sensor deployments (Table 1). Parameters in plain text were calculated by applying the salinity and TA values shown in bold to the hourly temperature and pH measurements. DIC measurements were used to calibrate the initial pH measurements and were not used in the calculations of other parameters.