O

i—|—i—i—i—i—|—i—i—i—i—|—i—i—i—i—|—i—i—i—i—|—i—i—i—i—|—i—i—i 175 200 225 250 275 300

Day No. of 1992

Figure 7.15 Time series of O, abundance on three potential temperature surfaces. Each point is one day of UARS MLS O, data (version 4, 205 GHz) averaged over the Antarctic polar vortex, defined using the Nash et at. 1219] algorithm and PV from the UKMO assimilation system.

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