Table 1 Mean parameter changes during each of the four experiments. Differences (\(\Delta\)) are based on pre-dosing background measurements taken immediately prior to dosing during each experimental day. The values of TCO\(_2\) and Alk are from discrete samples, and the signal strength is computed on the basis of the NaOH addition and Alk samples at corresponding sample locations. NF1 = near field 1 position, NF2 = near field 2 position (see Fig. 5c) for sample locations. Parameter mean signals at each location as reported with standard deviation (stdev) in brackets, (-) indicates only one sample was taken and there is no stdev.
From: Alkalinity enhancement with sodium hydroxide in coastal ocean waters
Experiment | Position | \(\Delta\)pCO\(_2\) | \(\Delta\)TCO\(_2\) | \(\Delta\)Alk | \(\Delta\)pH | Signal strength | Mean pCO\(_2\) | Mean TCO\(_2\) | Mean Alk | Mean pH |
|---|---|---|---|---|---|---|---|---|---|---|
\(\mu\)atm | \(\mu\)mol kg\(^{-1}\) | \(\mu\)mol kg\(^{-1}\) | \(\%\) | \(\mu\)atm | \(\mu\)mol kg\(^{-1}\) | \(\mu\)mol kg\(^{-1}\) | ||||
1 | Release | 38 | 0 | 36 | 0.05 | 2.2 | 408 (25) | 2044 (19) | 2265 (19) | 8.03 (0.03) |
NF1 | 28 | - | - | 0.03 | - | 407 (5) | - | - | 8.01 (0.01) | |
NF2 | 10 | 0 | 5 | 0.01 | 0.5 | 436 (3) | 2058 (-) | 2247 (-) | 7.99 (0.00) | |
Downstream | 43 | -2 | 29 | 0.05 | 2.8 | 403 (16) | 2055 (-) | 2271 (-) | 8.03 (0.02) | |
2 | Release | 338 | 2 | 544 | 0.71 | 49.4 | 107 (57) | 2059 (n=1) | 2787 (-) | 8.69 (0.03) |
NF1 | 15 | -2 | 6 | 0.01 | 0.51 | 431 (8) | 2055 (-) | 2248 (-) | 7.99 (0.00) | |
NF2 | 10 | 4 | 9 | 0.01 | 0.8 | 435 (8) | 2061 (-) | 2251 (-) | 7.99 (0.01) | |
Downstream | 54 | 6 | 49 | 0.06 | 4.5 | 391 (14) | 2063 (-) | 2291 (-) | 8.05 (0.01) | |
3 | Release | 209 | 6 | 139 | 0.27 | 12.5 | 286 (32) | 2077 (-) | 2378 (-) | 8.22 (0.02) |
NF1 | -4 | 4 | 1 | -0.01 | 0.1 | 498 (18) | 2075 (-) | 2240 (-) | 7.65 (0.00) | |
NF2 | 7 | -3 | 0 | 0.01 | 0.0 | 488 (13) | 2068 (-) | 2239 (-) | 7.69 (0.01) | |
Downstream | 8 | 0 | 7 | 0.01 | 0.6 | 487 (14) | 2071 (-) | 2246 (-) | 7.97 (0.01) | |
4 | Release | 158 | 3 | 69 | 0.18 | 6.2 | 337 (26) | 2074 (-) | 2308 (-) | 8.13 (0.04) |
NF1 | -20 | 5 | 0 | -0.02 | 0.0 | 515 (9) | 2075 (-) | 2239 (-) | 7.94 (0.00) | |
NF2 | 7 | -9 | 0 | 0.01 | 0.0 | 486 (1) | 2062 (-) | 2239 (-) | 7.96 (0.00) | |
Downstream | 62 | -4 | 34 | 0.05 | 3.1 | 433 (17) | 2067 (-) | 2273 (-) | 8.00 (0.02) | |
Pre-experiment | Â | Â | Â | Â | Â | Â | 445 (20) | 1898 (56) | 2062 (61) | 7.96 (0.01) |
Post-experiment | Â | Â | Â | Â | Â | Â | 458 (17) | 1932 (23) | 2109 (26) | 7.97 (0.02) |
