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| Titel |
Sources and sinks of acetone, methanol, and acetaldehyde in North Atlantic marine air |
| VerfasserIn |
A. C. Lewis, J. R. Hopkins, L. J. Carpenter, J. Stanton, K. A. Read, M. J. Pilling |
| 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 ; 5, no. 7 ; Nr. 5, no. 7 (2005-08-01), S.1963-1974 |
| Datensatznummer |
250002993
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| Publikation (Nr.) |
 copernicus.org/acp-5-1963-2005.pdf |
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| Zusammenfassung |
| Measurements of acetone, methanol, acetaldehyde and a range of non-methane hydrocarbons
have been made in North Atlantic marine air at the Mace Head observatory. Under maritime
conditions the combination of OVOCs (acetone, methanol and acetaldehyde) contributed up
to 85% of the total mass of measured non methane organics in air and up to 80% of
the OH radical organic sink, when compared with the sum of all other organic compounds
including non-methane hydrocarbons, DMS and OH-reactive halocarbons (trichloromethane and
tetrachloroethylene). The observations showed anomalies in the variance and abundance of
acetaldehyde and acetone over that expected for species with a remote terrestrial emission
source and OH controlled chemical lifetime. A detailed model incorporating an explicit
chemical degradation mechanism indicated in situ formation during air mass transport
was on timescales longer than the atmospheric lifetime of precursor hydrocarbons or primary
emission. The period over which this process was significant was similar to that of airmass
motion on intercontinental scales, and formation via this route may reproduce that of a
widespread diffuse source. The model indicates that continued short chain OVOC formation
occurs many days from the point of emission, via longer lived intermediates of
oxidation such as organic peroxides and long chain alcohols. |
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