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- From: parson_r@cubldr.colorado.edu (Robert Parson)
- Subject: Re: Another ozone question
- Message-ID: <1993Jan27.191034.1@cubldr.colorado.edu>
- Lines: 24
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- Organization: University of Colorado, Boulder
- References: <1k3fo2INN29k@gap.caltech.edu> <1993Jan26.173513.1@cubldr.colorado.edu> <JMC.93Jan26211304@SAIL.Stanford.EDU>
- Date: Thu, 28 Jan 1993 02:10:34 GMT
- Lines: 24
-
- In article <JMC.93Jan26211304@SAIL.Stanford.EDU>,
- jmc@SAIL.Stanford.EDU (John McCarthy) writes:
- > I think the non-chemists may need it pointed out that molecular oxygen
- > O2 and ozone O3 are always being converted back and forth. How much
- > ozone there is relative to molecular oxygen depends on the rates of
- > these processes, and these are affected by substances present in small
- > quantities.
- >
- > What else is involved?
- >
- In the strat., flux of solar radiation with wavelength < 240 nm
- determines O2 -> O3 (in detail, O2 + hv -> O + O, then O + O2 -> O3)
-
- Undoubtedly the sun's UV output has varied significantly on the
- billion-year timescale.
-
- Recombination (O + O3 -> 2 O2) is slow in the absence of catalysts
- (oxides of nitrogen and hydrogen, as well as chlorine and bromine).
- Absorption of UV-B and UV-C _by_ ozone does not result in a net ozone
- loss.
-
- In the troposphere ozone production is a lot more complicated.
-
-
-