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Effects of model chemistry and data biases on stratospheric ozone assimilation

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Fig. 1. Schematic depiction of a GOATS cycle. The two main com- com-ponents are NOGAPS-ALPHA (ozone forecast) and GEOS ozone DAS (ozone analysis)
Fig. 2. Model half levels around 34.5 ◦ N latitude circle for (a) NOGAPS L30 (pure σ levels) and (b) NOGAPS-ALPHA L55 levels (hybrid σ –p levels)
Table 1. Mid-September 2002 values of SBUV/2 observations for layers 3–12 used in scaling vertical profile plots.
Fig. 4. Total ozone in the Southern Hemisphere for 20–30 September 2002 (48-h intervals) from the Total Ozone Mapping Spectrometer (TOMS; top row) and from the GOATS T79L55 run with CHEM2D-OPP chemistry (bottom row).
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