Atmospheric Science

Looking for signs of ozone recovery

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Science  18 Jul 2014:
Vol. 345, Issue 6194, pp. 281
DOI: 10.1126/science.345.6194.281-c

How effective is the Montreal Protocol, the international treaty aimed at protecting the stratospheric ozone layer? Since the treaty was adopted in 1989, manufacturers have gradually stopped producing numerous chemicals that deplete ozone. Scientists have predicted that ozone will recover as a result. Coldewey-Egbers et al. use an extensive data set to test whether recovery can be detected yet. They conclude that in mid-latitudes, at least five more years of data are needed to unequivocally detect signs of recovery, because natural variability masks the ozone recovery. At lower latitudes, where the trend in ozone concentration is smaller, even more data will be needed.

Geophys. Res. Lett. 10.1002/2014GL060212 (2014).

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