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| Titel |
ACE-FTS observations of acetonitrile in the lower stratosphere |
| VerfasserIn |
J. J. Harrison, P. F. Bernath |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 15 ; Nr. 13, no. 15 (2013-08-02), S.7405-7413 |
| Datensatznummer |
250018800
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| Publikation (Nr.) |
 copernicus.org/acp-13-7405-2013.pdf |
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| Zusammenfassung |
| This work reports the first infrared satellite remote-sensing measurements
of acetonitrile (CH3CN) in the Earth's atmosphere using solar
occultation measurements made by the Atmospheric Chemistry Experiment
Fourier transform spectrometer (ACE-FTS) between 2004 and 2011. The
retrieval scheme uses new quantitative laboratory spectroscopic measurements
of acetonitrile (Harrison and Bernath, 2012). Although individual ACE-FTS
profile measurements are dominated by measurement noise, median profiles in
10° latitude bins show a steady decline in volume mixing ratio
from ~150 ppt (parts per trillion) at 11.5 km to < 40 ppt at 25.5–29.5 km. These new measurements agree well with the scant available air- and
balloon-borne data in the lower stratosphere. An acetonitrile stratospheric
lifetime of 73 ± 20 yr has been determined. |
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