Table 1.
Seawater pH and associated carbonate chemistry parameters measured between May 2011 and May 2013 at six sample sites off Vulcano, Italy. Carbonate chemistry parameters were calculated from pHNBS and mean total alkalinity (TA) measurements at each site (n values for each are shown next to site names)
| Site | pH (NBS) | TA (μmol/kg SW) | pCO2 (μatm) |
 (μmol/kg SW) |
 (μmol/kg SW) |
ΩCalc | ΩArag |
|---|---|---|---|---|---|---|---|
| Ref 2(npH = 11, nTA = 7) | |||||||
| Min | 8.12 | 2320.5 | 396.3 | 1895.7 | 198.7 | 4.66 | 3.10 |
| Median | 8.17 | 2538.7 | 418.0 | 1973.4 | 216.6 | 5.05 | 3.29 |
| Max | 8.25 | 2607.2 | 643.8 | 2023.3 | 250.8 | 5.90 | 3.95 |
| Ref 1(npH = 10, nTA = 7) | |||||||
| Min | 8.12 | 2368.4 | 395.3 | 1906.4 | 193.6 | 4.54 | 3.02 |
| Median | 8.17 | 2554.6 | 423.1 | 1991.8 | 220.9 | 5.15 | 3.36 |
| Max | 8.25 | 2645.6 | 682.4 | 2061.6 | 256.5 | 6.01 | 4.06 |
| High pH(npH = 8, nTA = 7) | |||||||
| Min | 7.98 | 2368.4 | 444.9 | 2026.5 | 157.7 | 3.69 | 2.44 |
| Median | 8.15 | 2580.3 | 698.6 | 2034.8 | 210.7 | 4.91 | 3.20 |
| Max | 8.15 | 2702.5 | 1292.7 | 2166.5 | 215.7 | 5.12 | 3.49 |
| Mid-pH(npH = 8, nTA = 6) | |||||||
| Min | 7.90 | 2392.4 | 519.0 | 2042.7 | 136.9 | 3.23 | 2.17 |
| Median | 8.01 | 2639.8 | 750.7 | 2193.1 | 167.0 | 3.92 | 2.60 |
| Max | 8.18 | 2776.3 | 1317.9 | 2267.7 | 228.8 | 5.36 | 3.54 |
| Low pH(npH = 8, nTA = 7) | |||||||
| Min | 7.61 | 2454.8 | 770.3 | 2269.9 | 76.0 | 1.77 | 1.15 |
| Median | 7.78 | 2652.6 | 1676.6 | 2461.0 | 114.6 | 2.70 | 1.81 |
| Max | 8.06 | 3004.1 | 2092.1 | 2552.0 | 193.7 | 4.54 | 3.00 |
| Very Low pH(npH = 8, nTA = 7) | |||||||
| Min | 7.61 | 2405.5 | 615.3 | 2182.3 | 77.9 | 1.82 | 1.18 |
| Median | 7.67 | 2663.3 | 1831.9 | 2477.0 | 85.9 | 2.01 | 1.34 |
| Max | 8.11 | 2958.3 | 2658.6 | 2495.6 | 207.8 | 4.86 | 3.20 |