Global distributions of carbonyl sulfide in the upper troposphere and stratosphere

被引：50

作者：

Barkley, Michael P. ^{[1
]}

Palmer, Paul I. ^{[1
]}

Boone, Chris D. ^{[2
]}

Bernath, Peter F. ^{[2
,5
]}

Suntharalingam, Parvadha ^{[3
,4
]}

机构：

[1] Univ Edinburgh, Sch Geosci, Edinburgh EH9 3JN, Midlothian, Scotland

[2] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[3] Univ E Anglia, Dept Environm Sci, Norwich NR4 7TJ, Norfolk, England

[4] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[5] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 14期

基金：

英国自然环境研究理事会;

关键词：

D O I：

10.1029/2008GL034270

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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).

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