Guest Post by Richard F. Cronin
August 3, 2017
After 31 years working for E.I. DuPont de Nemours here is my understanding about “ozone depletion” — the warm-up act for anthropogenic CO2-induced “global warming”. Even the proponents of human-induced “ozone depletion” are starting to realize that the thinning of the ozone layer is a natural phenomenon that just waxes and wanes.
Ozone (O3) is produced in the stratosphere by the intense solar radiation causing photo-dissociation of the di-atomic oxygen molecule (O2). The oxygen singlet (- O) is a powerful oxidizing agent and readily reacts with another O2 molecule to yield ozone. Ozone is not produced during the dark polar winters and its lowest point is in the early spring. The ozone layer is renewed by the sunlit polar summers.
Molina and Rowland published in 1974 and their core premise is that heavier-than-air chloro-fluoro carbons (CFCs) convect upwards using a “one dimensional diffusion model”, where they photo-dissociate due to ultraviolet radiation in the band of 2000 Angstroms to yield ozone -destroying chlorine and bromine. Molina and Rowland also stated that CFCs do not dissolve in water, so they are not scrubbed out by rain at lower elevations. However, it is known that organo-halogens adsorb on dust particles and aerosols which are scrubbed out by rain in the troposphere. Finally, volcanoes emit CFCs as well as copious amounts of hydrofluoric acid (HF), hydrochloric acid (HCl) and hydrodrobromic acid (HBr) which carry up to the stratosphere. (Ian Plimer, et al). See “Heaven and Earth” by Ian Plimer, University of Adelaide. There is always some equilibrium presence of these molecules, in trace quantities.
Click here for Atmospheric aerosols in the Earth System