Atmospheric concentrations of halocarbons in Japan in 1979-1986.
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概要
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The average atmospheric concentrations of halocarbons in the mid-latitude Northern Hemisphere have been measured accurately for 7 years from 1979 to 1986. Atmospheric samples were collected in summer and winter in Hokkaido (40–45°N), and the halocarbons at 10–400 pptv (pptv=10<SUP>−12</SUP> v/v) concentrations were determined with 0.5% precision. The concentrations of halocarbons with long lifetimes have been increasing steadily (CCl<SUB>2</SUB>F<SUB>2</SUB>: 18 pptv/year, CCl<SUB>3</SUB>F: 8–9 pptv/year, CH<SUB>3</SUB>CCl<SUB>3</SUB>: 4 pptv/year, CCl<SUB>4</SUB>: 2 pptv/year); those of shortlived halocarbons (CHCl=CCl<SUB>2</SUB> and CCl<SUB>2</SUB>=CCl<SUB>2</SUB>) are low (<25 pptv) and show only seasonal variations.
- 公益社団法人 日本化学会の論文
著者
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Yokohata Akihito
Department Of Chemistry Faculty Of Science University Of Tokyo
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Makide Yoshihiro
Department Of Chemistry Faculty Of Science The University Of Tokyo
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Tominaga Takeshi
Department Of Chemistry Faculty Of Science The University Of Tokyo
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Kubo Yuji
Department Of Applied Chemistry Faculty Of Engineering Saitama University
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