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Estimate of late 1974 stratospheric concentration of gaseous chlorine compounds (ClX)
Author(s) -
Cicerone R. J.,
Stedman D. H.,
Stolarski R. S.
Publication year - 1975
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl002i006p00219
Subject(s) - stratosphere , chlorine , troposphere , photodissociation , altitude (triangle) , atmospheric sciences , chemistry , environmental science , environmental chemistry , geology , photochemistry , organic chemistry , geometry , mathematics
We estimate the total concentration [ClX] versus altitude of Cl‐containing molecules, principally HCl, Cl and ClO. The predicted present stratospheric concentrations appear to be due to photolysis near 30 km of man‐made CF 2 Cl 2 and CFCl 3 , and CCl 4 from a ground‐level source, man‐made or natural. Based on preliminary measurements of CH 3 Cl at ground we estimate its contribution to stratospheric ClX through the major known loss mechanism for CH 3 Cl, abstraction by OH. Ground‐level sources of HCl and Cl 2 are large but tropospheric processes preclude significant impact on the stratosphere. Our computed profiles are consistent with first HCl concentrations measured by Lazrus et al. [1974, 1975] in the 15–27 km region.