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Global phosgene observations from the Atmospheric Chemistry Experiment (ACE) mission
Author(s) -
Fu Dejian,
Boone Chris D.,
Bernath Peter F.,
Walker Kaley A.,
Nassar Ray,
Manney Gloria L.,
McLeod Sean D.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl029942
Subject(s) - stratosphere , phosgene , occultation , atmospheric sciences , equator , atmospheric chemistry , altitude (triangle) , environmental science , latitude , mixing ratio , ozone , ozone layer , longitude , meteorology , chemistry , physics , astrophysics , astronomy , organic chemistry , geometry , mathematics
The first study of the global distribution of atmospheric phosgene (COCl 2 ) 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 zonally symmetric pattern with the maximum concentration located approximately over the equator at about 25 km in altitude and the concentration decreases towards the poles. A layer of enhanced concentration of phosgene spans the lower stratosphere over all latitudes, with volume mixing ratios of 20–60 pptv. The ACE observations show lower phosgene concentrations in the stratosphere than were obtained from previous observations in the 1980s and 1990s. This has been attributed to a significant decrease in its source species, particularly two major sources CH 3 CCl 3 and CCl 4 , since the introduction of restrictions required by the Montreal Protocol and its amendments.