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These maps are MLS measurements of H2O and ozone on two consecutive days in November 1991 before breakup of the Antarctic vortex, and show `peeling' from the vortex edge. The data have been interpolated to the 655 K isentropic surface (approximately 25 km height) where the vortex is relatively moist (due to descent of moist air from above) and depleted of ozone. A large filament is seen breaking off the edge of the vortex and moving over South America and westward to the Pacific. The color bars range from 3.5 to 5.1 ppbv for H2O and 2.5 to 7.0 ppmv for ozone. See Harwood, et al. [1993] for further discussion of these data and analyses.

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