Until the discovery of the ozone hole in the mid-1980s, polar stratospheric clouds (PSCs) were considered beautiful curiosities. In their Perspective, [Tolbert and Toon][1] describe the insights gained since then into how PSCs form and how they affect the destruction of stratospheric ozone. [1]: http://www.sciencemag.org/cgi/content/full/292/5514/61
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Tolbert et al. (2001) studied this question.
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