Sensitivity of climate to dynamically-consistent zonal asymmetries in ozone

Details Sensitivity of climate to dynamically-consistent zonal asymmetries in ozone Sensitivity of climate to dynamically-consistent zonal asymmetries in ozone

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3610809g&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 10, CiteID L10809

Physics

9

Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry

Scientific paper

Previous investigations into the effect of zonal asymmetries in ozone on climate have compared simulations with prescribed 3-D ozone, in which the ozone is not necessarily consistent with the model dynamics, to simulations with prescribed zonal mean ozone. We assess the impact of zonal asymmetries in ozone by comparing a control simulation of a coupled chemistry version of the Canadian Middle Atmosphere Model (CMAM) in which the ozone and model dynamics are consistent, with a simulation in which only the zonal mean of the ozone is passed to the radiative transfer scheme. These simulations reveal a robust stratospheric zonal-mean temperature and geopotential height response to zonal asymmetries in ozone that is consistent with that identified in previous studies and of a magnitude comparable to observed trends. These results suggest that the inclusion of zonal asymmetries in ozone may be essential for the accurate simulation of future stratospheric temperature trends.

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