Tropospheric OH and the lifetimes of hydrochlorofluorocarbons

摘要: Hydrochlorofluorocarbons (HCFCs) may be used as alternatives for the chlorofluorocarbons (CFCs). Lifetimes HCFCs are predicted here in two ways: integrating their loss with a global model, and scaling to another compound better known lifetime. Both approaches shown yield similar results. Three-dimensional fields of modeled tropospheric OH concentrations calculate lifetimes against destruction by other hydrogenated halocarbons. The taken from three-dimensional chemical transport model [Spivakovsky et al., 1990a] that accurately simulates measurements methyl chloroform (derived lifetime 5.5 yr). various hydro-halocarbons insensitive possible spatial variations seasonal cycles. It is scale HCFC or methane using ratio rate coefficients reaction at an appropriate temperature, about 277 K.