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Wolff et al. 1979
Wolff, G.T., Ferman, M.A. and Monson, P.R. (1979). The distribution of beryllium-7 within high-pressure systems in the Eastern United States. Geophysical Research Letters 6: doi: 10.1029/GL006i008p00637. issn: 0094-8276.

During a 1976 rural ozone field study conducted in McKee, Kentucky, and Busick, North Carolina, simultaneous measurements of ozone and beryllium-7, a tracer of stratospheric air, were obtained. The purpose of this study was to assess the importance of naturally produced stratospheric ozone on ground-level ozone concentrations observed in rural areas in the Eastern United States. It is currently accepted that the stratospheric contribution to the surface ozone is about 30-50 ppb, and that the occurrence of this is confined to the front part of high-pressure systems immediately behind a cold front. Furthermore, it is thought that the stratospheric contribution is negligible on the back side of the high-pressure system where higher levels of ozone occur. This study seriously questions both of these hypotheses because the highest levels of beryllium-7 were observed on the back side and not on the front side of high-pressure systems.

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Geophysical Research Letters
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