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| Titel |
From emissions to ambient mixing ratios: online seasonal field measurements of volatile organic compounds over a Norway spruce-dominated forest in central Germany |
| VerfasserIn |
E. Bourtsoukidis, J. Williams, J. Kesselmeier, S. Jacobi, B. Bonn |
| 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 ; 14, no. 13 ; Nr. 14, no. 13 (2014-07-01), S.6495-6510 |
| Datensatznummer |
250118846
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| Publikation (Nr.) |
 copernicus.org/acp-14-6495-2014.pdf |
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| Zusammenfassung |
| Biogenic volatile organic compounds (BVOCs) are substantial contributors to
atmospheric chemistry and physics and demonstrate the close relationship
between biosphere and atmosphere. Their emission rates are highly sensitive
to meteorological and environmental changes with concomitant impacts on
atmospheric chemistry. We have investigated seasonal isoprenoid and
oxygenated VOC (oxVOC) fluxes from a Norway spruce (Picea abies)
tree in central Germany and explored the emission responses under various
atmospheric conditions. Emission rates were quantified by using dynamic
branch enclosure and proton-transfer-reaction mass spectrometry (PTR-MS)
techniques. Additionally, ambient mixing ratios were derived through
application of a new box model treatment on the dynamic chamber measurements.
These are compared in terms of abundance and origin with the corresponding
emissions. Isoprenoids dominate the BVOC emissions from Norway spruce, with
monoterpenes and sesquiterpenes accounting for 50.8 ± 7.2% and
19.8 ± 8.1% respectively of the total emissions. Normalizing the VOC
emission rates, we have observed a trend of reduction of carbon-containing
emissions from April to November, with an enhancement of oxVOC. Highest
emission rates were observed in June for all measured species, with the
exception of sesquiterpenes, which were emitted most strongly in April.
Finally, we evaluate the temperature-dependent algorithm that seems to
describe the temperature-dependent emissions of methanol, acetaldehyde and
monoterpenes but only with the use of the monthly derived values for emission
potential, Es, and temperature dependency, β factor. |
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