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| Titel |
The global atmospheric budget of ethanol revisited |
| VerfasserIn |
W. V. Kirstine, I. E. Galbally |
| 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 ; 12, no. 1 ; Nr. 12, no. 1 (2012-01-11), S.545-555 |
| Datensatznummer |
250010450
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| Publikation (Nr.) |
 copernicus.org/acp-12-545-2012.pdf |
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| Zusammenfassung |
| Ethanol is an important biogenic volatile organic compound, which is
increasingly used as a fuel for motor vehicles; therefore, an improved
understanding of its atmospheric cycle is important. In this paper we use
three sets of observational data, measured emissions of ethanol from living
plants, measured concentrations of ethanol in the atmosphere and measured
hydroxyl concentrations in the atmosphere (by methyl chloroform titration),
to make two independent estimates related to the rate of cycling of ethanol
through the atmosphere. In the first estimate, simple calculations give the
emission rate of ethanol from living plants as 26 (range, 10–38) Tg yr−1.
This contributes significantly to the total global ethanol source
of 42 (range, 25–56) Tg yr−1. In the second estimate, the total losses
of ethanol from the global atmosphere are 70 (range, 50–90) Tg yr−1,
with about three-quarters of the ethanol removed by reaction with hydroxyl
radicals in the gaseous and aqueous phases of the atmosphere, and the
remainder lost through wet and dry deposition to land. These values of both
the source of ethanol from living plants and the removal of atmospheric
ethanol via oxidation by hydroxyl radicals (derived entirely from
observations) are significantly larger than those in recent literature. We
suggest that a revision of the estimate of global ethanol emissions from
plants to the atmosphere to a value comparable with this analysis is
warranted. |
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