Footnote gb

^gbCruise in GLODAPv1.1 (Key et al. 2004), but now have carbon data, so include here also.

Key, R.M., A. Kozyr, C.L. Sabine, K. Lee, R. Wanninkhof, J. Bullister, R.A. Feely, F. Millero, C. Mordy, T.-H. Peng. 2004. A global ocean carbon climatology: Results from Global Data Analysis Project (GLODAP). Global Biogeochem. Cycles, 18, GB4031,doi:10.1029/2004GB002247.