qLong
Antarctic winter (May through September)
èThe
stratosphere is cold enough to form PSCs
èPSCs
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