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Tropospheric concentrations of methylchloroform, CH/sub 3/CCl/sub 3/, in January 1978 and estimates of the atmospheric residence times for hydrohalocarbons

Journal Article · · Proc. Natl. Acad. Sci. U.S.A.; (United States)
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The ground level tropospheric concentrations of Ch/sub 3/CCl/sub 3/ were measured from 55/sup 0/N to 53/sup 0/S during the time period around January 1, 1978. The northern temperature zone concentration of CH/sub 3/CCl/sub 3/ averaged 94.6 +- 4.0 x 10/sup -12/, for a worldwide average of 80 x 10/sup -12/ by volume. The ratio of concentrations between the two zones is 1.45 +- 0.07. The observed CH/sub 3/CCl/sub 3/ concentrations correspond to 0.52 +- 0.05 times the atmosphreic release to that date, corresponding to an atmospheric release to that date, corresponding to an atmospheric residence time of 6.9 +- 1.2 yr. The amospheric residence times for 22 other hydrohalocarbon molecules were estimated in comparison to that of CH/sub 3/CCl/sub 3/ through the relative rates of reaction with OH radicals.

Research Organization:
Univ. of California, Irvine
DOE Contract Number:
AT03-76ER70126
OSTI ID:
6037303
Journal Information:
Proc. Natl. Acad. Sci. U.S.A.; (United States), Journal Name: Proc. Natl. Acad. Sci. U.S.A.; (United States) Vol. 78:10; ISSN PNASA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
CHROMATOGRAPHY
EARTH ATMOSPHERE
GAS CHROMATOGRAPHY
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROXYL RADICALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RADICALS
REMOVAL
SEPARATION PROCESSES
TEMPERATURE DEPENDENCE
TROPOSPHERE