Footnote as

asSee Tanhua et al. 2006, 2008.

Tanhua, T., A. Biastoch, A. Körtzinger, H. Lueger, C. Böning and D.W.R. Wallace. 2006. Changes of anthropogenic CO2 and CFCs in the North Atlantic between 1981 and 2004. Global Biogeochem. Cycles GB4017, doi:10.1029/2006GB002695.

Tanhua, T., D.W. Waugh, and D.W.R. Wallace. 2008. Use of SF6 to estimate anthropogenic CO2 in the upper ocean, J. Geophys. Res. 113, C04037, doi:10.1029/2007JC004416.


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