Tracing the signatures of ozone recovery in the Arctic ozone.

39 report a positive trend in the northern hemispheric polar middle stratosphere (25–30 km), and Arosio et al. 45 also observe a positive trend in the upper stratosphere (34–48 km) around 180° W and 20° W.

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In brief, the analysis shows a negative trend in the pre-2000 period due to the high halogen loading in the stratosphere 7 , 36 , 37 .

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Similarly, MLS shows a significant positive trend in JJA (1.667 ± 0.523%/dec), DJF (0.693 ± 0.411%/dec), SON (0.94 ± 0.286%/dec), whereas MAM has a nonsignificant trend in the upper stratosphere, above 3 hPa.

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