Anthropogenic chlorine

Brasseur, G. P., X. Tie, P. J. Rasch, and F. Lefevre, A Three-Dimensional Simulation of the Antarctic Ozone Hole Impact of Anthropogenic Chlorine on the Lower Stratosphere and Upper Troposphere, J. Geophys. Res., 102, 8909-8930 (1997). 

Solomon, S R. W. Portmann, R. R. Garcia, W. Randel, F. Wu, R. Nagatani, J. Gleason, L. Thomason, L. R. Poole, and M. P. McCormick, Ozone Depletion at Mid-latitudes Coupling of Volcanic Aerosols and Temperature Variability to Anthropogenic Chlorine, Geophys. Res. Lett., 25, 1871-1874 (1998). 

A similar pattern is seen in the distribution of the Ca and S04 concentrations (Fig. 12.11) the values of the confined J aquifer of the GAB are an order of magnitude lower than the values found in the unconfined aquifer of the GDR. The distinction is less clear for the chlorine distribution, the higher values in the GDR wells possibly reflecting anthropogenic chlorine pollution of the unconfined system. The abrupt... 

Some of the common anthropogenic chlorinated molecules such as CH3CCL (Methylchloroform) and CHCIF2 (Fluorocarbon-22) are not fully halogenated, and contain C-H bonds which are susceptible to reaction with tropospheric HO radicals. The most abundant of these in its present atmospheric concentration is CHjCCh which is decomposed by reaction (5). 

We also note that other important anthropogenic chlorine-containing substances like PCBs are emitted that have severe health effects. In this review, however, we concentrate on reactive halogen compounds that have an impact on tropospheric chemistry. 

Khalil MAK. Rasmussen RA. 1984. Methylchloroform Global distribution, seasonal cycles, and anthropogenic chlorine. Chemosphere. 13 789-800. 

A major source of anthropogenic chlorine currently results from the photolysis of chlorofluorocarbons and other chlorocarbons in the stratosphere. In the case of CFC13 (also called chlorofluorocarbon-11 or CFC-11) the most likely degradation scheme is the following ... 

Accompanying to the increase of the mixing ratio of QOx due to the increase of anthropogenic chlorine containing compounds, self-reaction between ClOx is getting important, which will be described in sect. 8.3. 

---