8.3 QBO Signals in Chemical Constituents Simulated with WACCM

Thursday, 10 January 2019: 2:00 PM
West 212A (Phoenix Convention Center - West and North Buildings)
Rolando R. Garcia, NCAR, Boulder, CO; and J. Richter

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, NOyand other constituents. Ozone signals are produced directly by transport (below ~10 hPa) and by the influence of temperature and NOyon 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.
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