Chlorofluoromethanes in the environment
Book
·
OSTI ID:7248540
A study is presented on the photoprocesses of atmospheric chlorofluoromethanes, including their ultimate sinks. Topics covered include: current inventories of atmospheric trichlorofluoromethane and dichlorodifluoromethane, absorption cross-sections for photodissociation of chlorofluoromethanes, mechanisms and quantum yields for photodissociation of CF/sub 2/Cl/sub 2/ and CFCl/sub 3/, solar irradiation flux versus wavelength and altitude, atmospheric diffusion models, chain reactions in the ozone layer, the chloroxyl chains for decomposition of O/sub 3/, abstraction reactions by thermal chlorine atoms, release of Cl atoms by hydroxyl radical attack on hydrogen chloride, methane concentrations at 50 km, rate constants for ClO/sub x/ reactions with O/sub 3/ and oxygen atoms, chain terminating reactions, the importance of symmetrical dioxychloride in the stratosphere, fluorine atom chains, possible removal of chlorofluoromethanes by electron capture and/or ionic reaction, possible chlorofluoromethane removal by reaction with singlet oxygen, hydrolysis of chlorofluoromethanes, possible reactions of chlorofluoromethanes with aerosol particles in the stratosphere, calculated O/sub 3/ depletion by chlorine-containing species, multi-dimensional calculations, feedback in the ozone depletion calculation, increased odd oxygen production with O/sub 3/ depletion, time delay effects in the appearance of O/sub 3/ depletion, time concentration patterns with a one year stepfunction injection of CF/sub 2/Cl/sub 2/ and for several hypothetical models of chlorofluoromethane release stratospheric concentrations from CF/sub 2/Cl/sub 2/ injected by 1975, estimates of consequences for two different manufacturing patterns for CF/sub 2/Cl/sub 2/ between 1975 and 1990, current stratospheric levels of chlorine-containing compounds, possible biological and climatological effects of stratospheric O/sub 3/ depletion, and observable trends in the average O/sub 3/ concentration of the atmosphere.
- DOE Contract Number:
- AT(04-3)-34
- OSTI ID:
- 7248540
- Country of Publication:
- United States
- Language:
- English
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKANES
CHEMISTRY
CHLORINATED ALIPHATIC HYDROCARBONS
CRYOGENIC FLUIDS
EARTH ATMOSPHERE
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
METHANE
ORGANIC CHLORINE COMPOUNDS
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ORGANIC FLUORINE COMPOUNDS
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKANES
CHEMISTRY
CHLORINATED ALIPHATIC HYDROCARBONS
CRYOGENIC FLUIDS
EARTH ATMOSPHERE
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
METHANE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OZONE
PHOTOCHEMISTRY