qLong Antarctic winter (May through September)
èThe stratosphere is cold enough to form PSCs
èPCSs deplete odd nitrogen (NO)
èHelp convert unreactive forms of chlorine (ClONO2 and HCl) into more reactive forms (such as
Cl2).
èThe reactive chlorine remains bound to the surface of clouds
particles.
èSunlight returns in springtime (September)
èThe sunlight releases reactive
chlorine from the particle surface.
èThe chlorine destroy ozone in
October.
èOzone hole appears.
èAt the end of winter, the polar vortex breaks down.
èAllow fresh ozone and odd nitrogen to be brought in from low latitudes.
èThe ozone hole recovers (disappears)
until next October.
è
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