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Atmospheric COCl 2 measured by solar occultation spectrometry
Author(s) -
Toon G. C.,
Blavier J.F.,
Sen B.,
Drouin B. J.
Publication year - 2001
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 - 10.1029/2000gl012156
Subject(s) - occultation , altitude (triangle) , troposphere , mixing ratio , atmospheric sciences , environmental science , stratosphere , atmospheric chemistry , radio occultation , air mass (solar energy) , meteorology , remote sensing , geology , physics , ozone , cosmic cancer database , astrophysics , geometry , mathematics , boundary layer , thermodynamics
Vertical profiles of atmospheric COCl 2 (phosgene, carbonyl dichloride) have been measured remotely by the JPL MkIV interferometer during recent balloon flights. The v 5 band of COCl 2 in the 830 to 860 cm −1 spectral region was used for the analyses, despite its overlap with the stronger v 4 band of CCl 3 F. Upper troposphere COCl 2 volume mixing ratios of around 20 pptv were retrieved, increasing to 25 pptv by 15 km altitude, in good agreement with previous aircraft measurements made by in situ techniques. At mid‐latitudes the COCl 2 peaks at around 30 pptv at 22 km altitude, above which it rapidly drops, reaching zero by 28 km altitude.