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| Titel |
Hydrocarbon fluxes above a Scots pine forest canopy: measurements and modeling |
| VerfasserIn |
J. Rinne, R. Taipale, T. Markkanen, T. M. Ruuskanen, H. Hellén, M. K. Kajos, T. Vesala, M. Kulmala  |
| 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 ; 7, no. 12 ; Nr. 7, no. 12 (2007-06-27), S.3361-3372 |
| Datensatznummer |
250005097
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| Publikation (Nr.) |
 copernicus.org/acp-7-3361-2007.pdf |
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| Zusammenfassung |
| We measured the fluxes of several hydrocarbon species
above a Scots pine (Pinus sylvestris) stand using disjunct eddy covariance technique with
proton transfer reaction – mass spectrometry. The measurements were
conducted during four days in July at SMEAR II research station in
Hyytiälä, Finland. Compounds which showed significant emission
fluxes were methanol, acetaldehyde, acetone, and monoterpenes. A stochastic
Lagrangian transport model with simple chemical degradation was applied to
assess the sensitivity of the above canopy fluxes to chemistry. According to
the model, the chemical degradation had a minor effect on the fluxes
measured in this study but may have a major effect on the vertical flux
profiles of more reactive compounds, such as sesquiterpenes. The monoterpene
fluxes derived using M81 and M137 had a systematic difference with the
latter one being higher. These fluxes followed the traditional exponential
temperature dependent emission algorithm but were considerably higher than
the fluxes measured before at the same site. The normalized monoterpene
emission potentials at 30°C, obtained using the temperature dependence
coefficient of 0.09°C−1, were 2.0 μg gdw−1
h−1
and 2.5 μg gdw−1 h−1, for fluxes derived using M81 and
M137. |
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