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A continuous section of surface ozone concentration in the eastern equatorial and southern tropical Atlantic shows maximum values (30–48 ppbV) in the ITCZ with low uniform values (13–15 ppbV) in the southeast trades. The high values are associated with mesoscale downdrafts in the convergence region. The southerly data show diurnal variations with night‐time maxima the amplitude of which increases landwards. These are probably caused by atmospheric cooling over the warm ocean.
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Stallard et al. (1975) studied this question.
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