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ozone hole induces a large increase in surface UV-B radiation, cholorofluorcarbons are in large part responsible for ozone hole, cholorofluorcarbons in the atmoshere have very long atmospheric lifetimes, PSCs form in the very cold containment vessel, PSCs with their crystals provide surfaces on which chlorine can destroy ozone via a catalytic reaction, cholorofluorcarbons are broken down by photodissociation into active chlorine, ozone hole induces a small increase in surface UV-A radiation, active chlorine interacts with PSCs, catalytic reaction that destroys ozone occurs within the containment vessel, dose rate spectrum is a function of Action spectrum, photosynthesis can help regenerate photodamaged plants, ozone hole occurs every October over the Antarctic continent, polar vortex prevents meridonal heat exchanges and creates an isolated containment vessel, polar vortex forms during the SH winter over Antarctic continent, plants are exposed for long periods of time to increased UV-B radiation, dose rate spectrum is a function of flux of UV-B radiation