| Summary: | [Extract] In his comment on our paper, Moran (Moran, 2014) raises the important issue of ensuring that experiments investigating the responses of marine organisms to future ocean acidification scenarios are carried out with a high degree of certainty about the CO2 levels being tested. We agree wholeheartedly, which is why we take considerable care in measuring and validating pCO2 in our field-based and laboratory experiments. Here we explain, more fully than was possible in a Short Communication, the procedures used to measure and cross-validate pCO2 in Chung et al. (Chung et al., 2014) and other studies we have conducted over recent years (in which the methods have been reported). These techniques are in accordance with those mentioned by Moran and detailed descriptions are already available in the literature (e.g. Hari et al., 2008). We also correct a number of factual errors and incorrect assumptions made by Moran in his comment.
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