Prospero, J. M., R. Schmitt, E. Cuevas, D. L. Savoie, W. C. Graustein, K. K. Turekian, A. Volz-Thomas, A. Diaz, S. J. Oltmans, and H. Levy II, 1995: Temporal variability of summer-time ozone and aerosols in the free troposphere over the eastern North Atlantic. Geophysical Research Letters, 22(21), 2925-2928.

Abstract: In the free troposphere over Tenerife in the summer, O₃ concentrations are anti-correlated with major pollutant aerosols and with ²¹⁰Pb, a tracer for boundary layer sources. In contrast O₃ is highly correlated with ⁷Be, a product of cosmic ray interactions in the upper troposphere and stratosphere. This suggests that natural O₃ sources (i.e., the stratosphere) might be playing an important role. Nonetheless our results do not preclude the possibility that substantial amounts of pollution-related O₃ could be tranpsorted in the free troposphere. However, to be consistent with our results, the transport mechanisms would have to incorporate efficient processes for the removal of pollutant aerosol species and ²¹⁰Pb.