antarctic ozone hole

A phenomenon discovered in the mid-1980s that occurs in the winter–spring lower stratosphere over Antarctica.

Through a sequence involving heterogeneous chemistry on polar stratospheric clouds and (intermittent) illumination by sunlight, much or all of the ozone in the lower stratosphere can be photochemically destroyed. Halogen species (chlorine and bromine) contained in fairly robust molecules are transformed via heterogeneous reactions into molecules that are easily photolyzed resulting in atomic or monoxide halogens that lead to chemical destruction of ozone. This phenomenon also occurs over the Arctic, although to a lesser extent because of a lower incidence of polar stratospheric clouds.
Farman, J. C., Gardiner, and J. D. Shanklin 1985. Large losses of total ozone in Antarctica reveal seasonal ClO_x/NO_x interaction. Nature. 315. 208–210.
Solomon, S., R. Garcia, F. S. Rowland, and D. J. Wuebbles 1986. On the depletion of antarctic ozone. Nature. 321. 919–935.
Crutzen, P. J., and F. Arnold 1986. Nitric acid cloud formation in the cold antarctic stratosphere: A major cause for the springtime "ozone hole". Nature. 324. 651–655.
Molina, L. T., and M. J. Molina 1987. Production of Cl₂O₂ from the self reaction of the ClO radical. J. Phys. Chem.. 91. 433–436.