home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!europa.asd.contel.com!emory!rsiatl!ke4zv!gary
- From: gary@ke4zv.uucp (Gary Coffman)
- Newsgroups: sci.environment
- Subject: Re: Stratospheric O3, Human Factors
- Keywords: research problem, O3, CO2, models, data, implications
- Message-ID: <1992Aug15.170134.15398@ke4zv.uucp>
- Date: 15 Aug 92 17:01:34 GMT
- References: <1992Aug12.183850.2520@mont.cs.missouri.edu>
- Reply-To: gary@ke4zv.UUCP (Gary Coffman)
- Organization: Gannett Technologies Group
- Lines: 43
-
- In article <1992Aug12.183850.2520@mont.cs.missouri.edu> bynum@miavx1.acs.muohio.edu (Frank Bynum) writes:
- >
- > Trace gas concentration changes can be particularly important
- >in determining EM radiative transport through our atmosphere. It works
- >at the level of spectral distribution of transmission and absorption of
- >solar input and thermal re-radiation.
- [deleted]
- > NO and Cl, photochemically released from various compounds,
- >undergo reactions which deplete O3 at stratospheric altitudes. In
- >further steps, NO and Cl can be regenerated, able to catalase more O3
- >removal. Factors of ~ 1E4 for moles O3 removed per mole of Cl supplied
- >(from sources including HCl and Freon) have been reported in the
- >technical literature about atmospheric chemistry of ozone. (_Current
- >State of Knowledge of the Upper Atmosphere_, in various editions
- >released every few years since 1989, is a NASA publication with coverage
- >of recent studies.)
- > Hence, atmospheric transparency to solar UVB light may be
- >increasing. If so, the health of biological systems in general at
- >ground level could be degraded as a consequence.
- > The majority science opinion now is that the suggestion of risk
- >merits cutback of CFC manufacturing and release from spray-can and
- >refrigerant products. Such seems to be prudent caution, prior to
- >establishment of certainty of the hypothesis or its disprovel.
-
- Speaking of NASA publications, anyone interested in the ozone question
- should read "Condensed Nitrate, Sulfate, and Chloride in Antarctic
- Stratospheric Aerosols" by a large group of NASA scientists out of
- Ames Reasearch Center and several universities. NASA TSP number is
- ARC-12618.
-
- This publication highlights a very illuminating relationship between
- condensed HNO3*3H2O and ozone depletion. There is a very strong inverse
- correlation between condensed nitrate concentration and ozone levels.
- Condensed nitric acid is not found above 200 degrees K in the stratosphere.
- When it is not present, chloride levels have no statistical relationship
- with ozone levels. Since the stratosphere at 18 km only drops below 200 K
- above 64 degrees latitude, chlorides can only deplete ozone levels above
- this latitude. So fear and panic about ozone depletion by beach dwellers
- in Southern California is not warranted. This work seems to show that
- banning CFCs is similar to the cyclamate ban of the sixties, a possible
- over-reaction to poorly understood correlations.
-
- Gary
-