RE: Ozone hole (help, help...)

[Tuan Pham <tuan.pham@unsw.edu.au>]

Hi Cuong

Briefly, conditions over Antarctica in spring are conducive to
O3 depletion because 

* Very cold winter conditions in Antartica lead to accumulation
of catalysts for the destruction of ozone.

* In spring, the sun appears and UV light activates the reaction.

* The "polar vortex" isolates the antarctic air mass and causes it
to behave like a reactor.

There is an ozone hole in the artic but it is much smaller
due to warmer conditions and weaker polar vortex.

There is a good www site on this at

http://vest.gu.se:70/0/ozone/antarctic

If you can't access, let me know and I'll forward.

Cheers
Tuan Pham