Past and future trends in ozone depleting chemicals from global observations and predictions based on the Montreal protocol

1997 
Significant stratospheric ozone losses, first detected during spring over Antarctica, now extend to all seasons and all latitudes poleward of 30degrees in both hemispheres. The losses over the period 1979-1994 at the mid-latitudes of both hemispheres are about 4-6% per decade. From 1992 to 1994 the springtime ozone deficits over Antarctica were the largest (area extent) and the deepest (lowest minimum ozone values) i observed to date [Harris etal. (1)]. Observations have demonstrated that gas phase and heterogeneous chlorine and iromine chemistries play major roles in the chemical destruction of ozone in both the mid-latitude and polar lower stratospheres [Jones et al. (2), Fahey et al. (3)].
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