QBO Signals in Chemical Constituents Simulated with WACCM

We present the results of simulations of the quasi-biennial oscillation (QBO) made with the Whole Atmosphere Community Climate Model (WACCM) that include interactive stratospheric chemistry. We find that the secondary circulation and mixing associated with the QBO produce quasi-biennial signals in ozone, N₂O, NO_yand other constituents. Ozone signals are produced directly by transport (below ~10 hPa) and by the influence of temperature and NO_yon ozone photochemistry (above ~10 hPa) These processes produce characteristic spatial distribution of chemical trace species in the West vs. East phases of the QBO. Mixing associated with barotropically unstable, short-wavelength Rossby-gravity waves, which have previously been documented in WACCM, is compared with similar findings in observations.