Seasonal variations in the atmospheric distribution of a reactive chlorine compound, tetrachloroethene (CCl2=CCl2)

摘要: Tropospheric mixing ratios of CCl2=CCl2 were measured at remote surface locations in the Pacific between 71°N and 47°S during September December 1989, March June 1990. The observed gradient decreasing concentrations from northern to southern hemisphere, very low hemisphere throughout year, indicates a predominant input hemisphere. Our seasonal measurements showed maximum occurring late winter minimum summer. This distinct variation is strongly coupled atmospheric abundance hydroxyl radical, only important species responsible for removal. Using estimated global emissions lifetime calculated be about 5.4 months which good agreement with 4.0 month estimate obtained inverse ratio its reaction rate constant compared that methylchloroform (CH3CCl3).