Halocarbons in the stratosphere
In April 1975 the stratospheric inventories of CCl$sub 3$F, CCl$sub 4$ and SF$sub 6$ were 260, 240 and 0.95 gigagrams, respectively. Based on the HASL box model of atmospheric transport, the three stratospheric inventories of CCl$sub 3$F measured since April 1974 are compatible with a stratospheric photolysis half life of 2 to 3 years and a total atmospheric half life of 18 to 24 years. Ratios of CCl$sub 3$F to $sup 85$Kr and HT in October 1974 decrease with altitude suggesting an increasing rate of photolysis of CCl$sub 3$F with height. Stratospheric stability increases from CCl$sub 4$ less than CCl$sub 3$F less than SF$sub 6$. Ratios of the three gases suggest a stratospheric circulation pattern similar to that observed for several radioactive substances released in the stratosphere. HCl from the destruction of CCl$sub 3$F accounts for about 30 percent of the measured HCl in the stratosphere. (auth)
- Research Organization:
- Energy Research and Development Administration, New York (USA). Health and Safety Lab.
- NSA Number:
- NSA-33-012071
- OSTI ID:
- 4146263
- Report Number(s):
- HASL--298
- Country of Publication:
- United States
- Language:
- English
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