Anthropogenic CO2 and CFCs in the North Atlantic Ocean-A comparison of man-made tracers

Details Anthropogenic CO2 and CFCs in the North Atlantic Ocean-A comparison of man-made tracers Anthropogenic CO2 and CFCs in the North Atlantic Ocean-A comparison of man-made tracers

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2065k&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 14, p. 2065-2068

Mathematics

Logic

13

Oceanography: Biological And Chemical: Chemical Tracers, Oceanography: Biological And Chemical: Carbon Cycling, Global Change: Oceans

Scientific paper

We compare estimates of the anthropogenic CO2 content of seawater samples from the subpolar North Atlantic Ocean calculated on the basis of a back-calculation technique with measurements of the chlorofluorocarbon CFC-11. Estimated anthropogenic CO2 concentrations are in the range 10-80 μmol kg-1, while CFC-11 concentrations cover the full range from below detection limit to >5 pmolkg-1 in waters at atmospheric equilibrium. The majority of the data points show a linear correlation between anthropogenic CO2 concentrations and CFC-11 saturation, which can only be explained by the strongly advective nature of the North Atlantic Ocean. Only deep eastern basin samples deviate from this general observation in that they show still significant concentrations of anthropogenic CO2 where CFC-11 is no longer detectable. In order to remove the influence of the Revelle factor reflected in the anthropogenic CO2 concentrations we have calculated `excess' pCO2, showing an even tighter linear correlation with atmospheric equilibrium concentrations of CFC-11.

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