DEJIAN FU, CHRIS D. BOONE, PETER F. BERNATH, KALEY A. WALKER, RAY NASSAR, SEAN D. MCLEOD, Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada; GLORIA L. MANNEY, NASA Jet Propulsion Laboratory/California Institute of Technology, Pasadena, CA, USA.
The first study of the global distribution of atmospheric phosgene (\chemCOCl2) has been performed using solar occultation measurements from the Atmospheric Chemistry Experiment (ACE) satellite mission. A total of 5614 measured profiles spanning the period February 2004 through May 2006 were used in the study. The phosgene concentrations display a symmetric pattern with the maximum concentration located approximately over the equator at about 25 km in altitude and concentration decreases towards the poles. A layer of enhanced phosgene spans the lower stratosphere over all latitudes, with volume mixing ratios of 20-60 pptv. The ACE observations show lower phosgene concentrations than were obtained from previous observations in the 1980s and 1990s. This has been attributed to a significant decrease in its source species since the introduction of restrictions required by the Montreal Protocol and its amendments.