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Development of ozone depletion over the years
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Chemical ozone depletion is not a quantity that can be measured
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directly. Ozone is also influenced by atmospheric transport. The time
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at which the polar vortex breaks down varies from year to year. One
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way to deduce the effect of chemical ozone depletion from the
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measurements is tto look at of the average ozone column in the polar
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vortex ("equivalent latitude" >63°). This quantity increases
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after the breakdown of the polar vortex (typically in March) due to
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the the transport of ozone-rich air masses towards the pole.
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Therefore the minimum of this quantity in March is an approximate measure
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of chemical ozone depletion in the Arctic. Here you can see this
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value for years up to and including 2019 and also the corresponding
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time series for Antarctica.
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