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Global distributions of carbonyl sulfide in the upper troposphere and stratosphere
Author(s) -
Barkley Michael P.,
Palmer Paul I.,
Boone Chris D.,
Bernath Peter F.,
Suntharalingam Parvadha
Publication year - 2008
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 - 10.1029/2008gl034270
Subject(s) - stratosphere , troposphere , atmospheric sciences , carbonyl sulfide , occultation , equator , mixing ratio , environmental science , dimethyl sulfide , latitude , climatology , altitude (triangle) , atmospheric chemistry , ozone , meteorology , geology , chemistry , physics , sulfur , geometry , mathematics , organic chemistry , geodesy , astronomy
We present the first upper tropospheric and stratospheric global distributions of carbonyl sulfide (OCS) observed from space using solar occultation measurements made by the Atmospheric Chemistry Experiment (ACE) satellite Fourier transform spectrometer during 2004–2006. We observe high OCS mixing ratios (>400 pptv) within the tropical stratosphere owing to convected tropospheric air. Stratospheric mixing ratios decrease more rapidly with altitude moving away from the Equator, creating a poleward gradient. Elevated OCS concentrations observed at low southern latitudes are consistent with a significant pyrogenic source. Using coincident ACE measurements of CFC‐11 and CFC‐12 we determine a global OCS stratospheric lifetime of 64 ± 21 years corresponding to a stratospheric sink of 63–124 Gg OCS yr −1 .