Fig. 3
From: Alkalinity enhancement with sodium hydroxide in coastal ocean waters
The addition of 1M NaOH solution to the coastal ocean at Woodbridge. Time series observations of pCO\(_2\) (± 2 \(\mu\)atm) and pH (± 0.24) during experimental trials on Day 1 (a) and Day 2 (b) with the locations of observations (release, near field (NF1 and NF2), downstream) given by the shading and labelled at the bottom of the panels. The periods of NaOH release are enclosed by the dashed boxes. Also shown as points are the pCO\(_2\) and pH values calculated from the discrete TCO\(_2\) and Alk samples, with error bars representing their respective uncertainties of ± 14 \(\mu\)atm and ± 0.012. On Day 1, the pCO\(_2\) observations were not recorded after 11:00, and have been estimated (dashed black line) on the basis of the corresponding pH observations, and the Alk sample (assumed constant in time) collected just prior.
