Raven et al (2005)
Also: Raven et al 2005
Ocean acidification due to increasing atmospheric carbon dioxide
https://royalsociety.org/topics-policy/publications/2005/ocean-acidification/
http://www.us-ocb.org/publications/Royal_Soc_OA.pdf
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.