11.4 Dynamical modes associated with the Antarctic ozone hole

Thursday, 11 June 2009: 2:50 PM
Pinnacle A (Stoweflake Resort and Confernce Center)
Bryan C. Weare, University of California, Davis, CA

Generalized Maximum Covariance Analysis (GMCA) has been developed and applied to diagnosing the dynamical modes associated with variations in the Antarctic spring ozone hole. GMCA is used to identify the most important patterns of co-variability between interannual ozone mixing ratio variations in the Antarctic region and temperature, zonal, meridional and vertical velocities between 100 and 10hPa in the same region. The most important two sets of GMCA time coefficients have variations showing trends connected with the growth of the Antarctic Ozone Hole related to the increase of ozone depleting substances. The associated spatial patterns of ozone variations may be characterized as being quasi-symmetric and asymmetric about the pole.

The year 2000 has been shown to be dominated by the asymmetric mode, whereas the adjacent year 2001 is dominated by the quasi-symmetric mode. A case study, focusing on the differences between these two years, shows the magnitude of the ozone mixing ratio, temperature and zonal wind differences to be in the range of 2 e-6 kg/kg, 10○ C and 10m/s, respectively. Budget calculations show that transport processes contribute substantially to the ozone and temperature changes in the middle stratosphere over the Antarctic continent. However, there is also evidence that both radiative and chemical processes also play important roles in the changes.

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