The Interaction Between Chemistry and Dynamics in a Climate Model during Antarctic ozone depletion events
Abstract
The CMAM is a general circulation model with a top at ~95 km with comprehensive on-line stratospheric chemistry. As part of the WMO report (Austin et al 2003) we have made several 20 year time slice runs for current and future atmospheric and ocean surface conditions. We have analysed these time slices scenarios with a view to characterizing the the variability of the timing and magnitude of ozone loss due to the of the Antarctica spring-summer stratospheric Vortex. We find that the dynamical influences are important and can alter the modelled ozone depletion in a significant fashion. Our analysis points to the need for a better characterization within all models of the actual wave forcing (planetary waves and gravity waves) for the time period of the climate being represented so that the model can reproduce the right vortex evolutionary character and hence ozone loss, for the right reasons. Thus, it is necessary to define scenario conditions in a more rigorous fashion in order to simulate the complex interactions between dynamics, chemistry and physics which produce particular ozone loss episodes.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2004
- Bibcode:
- 2004AGUSM.A23B..03B
- Keywords:
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- 0340 Middle atmosphere: composition and chemistry;
- 0341 Middle atmosphere: constituent transport and chemistry (3334);
- 0342 Middle atmosphere: energy deposition