Hi ROBERT.

09-Nov-02 11:48:00, ROBERT SAYRE wrote to WAYNE CHIRNSIDE


 WC>> I thought it was because it drifted into the ozone layer where it
 WC>> worked as a catalyst to break down the protective ozone layer.

 RJT>> I understand that this is the rationale that's been given in
 RJT>> some cases,  but it makes no sense to me why the "ozone hole"
 RJT>> that was reported should only show up over the south pole.

 RS> The "ozone hole" can only be produced when the temp is below
 RS> -80øC. This first step is necessary to "prepare" the CFC's to
 RS> change into clorine.

intersting... the southern hemiisphere has stronger seasons because of the
shape of the earths orbit has it further from the sun during the southern
winter,  - that could explain why the hole is over the south pole.

 RS> This is also why the "holes" are only present during certain
 RS> months of the year.

it's open all year down here AFAIK.

 -=> Bye <=-

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