Abstract
Key Customer Purpose This programme of work will provide information without which it will be impossible to assess the potential threat to UK marine waters of acidification resulting from the uptake of increased levels of CO2 into the sea. All the methodologies used will be reported in detail and provide the basis for future developments within the UK’s evolving Marine Monitoring and Assessment Strategy Summary Objective A two year long programme of observations will be made in conjunction with existing marine fieldwork programmes at key locations around the UK. This will enable the new information on pH to be set in the context of the variability in hydrographic and biogeochemical conditions that determine the observed pH.