Abstract
The diurnal cycle of surface ozone concentrations is examined with emphasis on the meteorological processes during the nighttime period. It is shown that the nocturnal ozone maxima observed in ozone episode areas can be correlated with vertical mixing of the remnant daytime boundary layer. This mixing is forced by an increase in wind speed above the nocturnal surface inversion. It is proposed that this process not only explains nighttime increases in ozone concentrations at low elevation surface stations but is probably also the process responsible for the reversed diurnal ozone fluctuations observed at mountain summits.
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