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at dz where PQ is photochemical production rate and w is the vertical velocity. Assuming production is unchanged, at steady state an increase in vertical velocity w will be accompanied by a decrease in the vertical gradient of O, (รข|0,]/9z). Assuming that [OJ at the tropopause does not change, a decrease in the vertical gradient means that there is less O, at each altitude above it [217]. Thus, the strengthening of the Brewer-Dobson circulation decreased column Of in the tropics |215,2181.

At mid- and high latitudes the O, abundance is set by the more complicated interplay between production, loss, and transport. Model simulations indicate that the increasing strength of the Brewer-Dobson circulation after the eruption of Mount Pinatubo led to the transport of more O, into these regions, leading to an increase in column O, [207,209,214,216].

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