The Vertical Distributions of Atmospheric CF2Cl2, CFC13 and N2O over Japan

[摘要] Tropospheric and stratospheric air samples were collected over Japan since 1978, and analyzed for CF2Cl2, CFC13 and N20 by a GC-ECD method.Mean volume mixing ratios in the troposphere were 282 ppt for CF2Cl2, 162 ppt for CFC13, and 310 ppb for N20 during October 1978 to March 1979. It was also found that the mean mixing ratios of CF2Cl2 and CFCl3 increased by about 20% from 1979 to 1983.The volume mixing ratios of CF2Cl2, CFCl3 and N20 in the lower stratosphere decreased with increasing altitude in accordance with the vertical profiles calculated from a photochemical theory.

[学科分类] 大气科学