Comments on: Please comment on this Science report on "The Ozone Layer"? http://www.nrfoam.org/high-density-foam/please-comment-on-this-science-report-on-the-ozone-layer/ Wed, 17 Mar 2010 10:13:59 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: ronwizfr http://www.nrfoam.org/high-density-foam/please-comment-on-this-science-report-on-the-ozone-layer/#comment-1408 ronwizfr Sun, 17 Jan 2010 11:01:59 +0000 http://www.nrfoam.org/high-density-foam/please-comment-on-this-science-report-on-the-ozone-layer#comment-1408 Overall you report is quite complete and well written. A few important things I can see that you might want to add: - there is a ban on the use of CFCs since more than twenty years. After negotiation of an international treaty (the Montreal Protocol), CFC production was sharply limited beginning in 1987 and phased out completely by 1996. - you don't talk at all about the ozone hole above the Antartic. It's the same phenomenon of course, but enhanced by the extreme cold, that in winter favorizes the creation of polar stratospheric clouds (PSCs). These PSCs are clouds of nitric acid and ice. The cloud particles act both as reaction surface for the depletion reaction and as catalyzer via the formation of hydrochloric acid (HCl) and chlorine nitrate (ClONO2). When spring and the Sun arrives, free Cl and ClO radicals are formed, which attack the ozone. The PSCs therefore act to concentrate the presence of radicals in the spring above the poles. - the reason why ozone depletion is harmful. Lastly: a good report quotes its sources.<br><b>References : </b><br>http://en.wikipedia.org/wiki/Ozone_layer Overall you report is quite complete and well written.

A few important things I can see that you might want to add:
- there is a ban on the use of CFCs since more than twenty years. After negotiation of an international treaty (the Montreal Protocol), CFC production was sharply limited beginning in 1987 and phased out completely by 1996.

- you don’t talk at all about the ozone hole above the Antartic. It’s the same phenomenon of course, but enhanced by the extreme cold, that in winter favorizes the creation of polar stratospheric clouds (PSCs).

These PSCs are clouds of nitric acid and ice. The cloud particles act both as reaction surface for the depletion reaction and as catalyzer via the formation of hydrochloric acid (HCl) and chlorine nitrate (ClONO2). When spring and the Sun arrives, free Cl and ClO radicals are formed, which attack the ozone. The PSCs therefore act to concentrate the presence of radicals in the spring above the poles.

- the reason why ozone depletion is harmful.

Lastly: a good report quotes its sources.
References :
http://en.wikipedia.org/wiki/Ozone_layer

]]>