 |
| Titel |
Methyl chavicol: characterization of its biogenic emission rate, abundance, and oxidation products in the atmosphere |
| VerfasserIn |
N. C. Bouvier-Brown, A. H. Goldstein, D. R. Worton, D. M. Matross, J. B. Gilman, W. C. Kuster, D. Welsh-Bon, C. Warneke, J. A. Gouw, T. M. Cahill, R. Holzinger |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 6 ; Nr. 9, no. 6 (2009-03-23), S.2061-2074 |
| Datensatznummer |
250007094
|
| Publikation (Nr.) |
 copernicus.org/acp-9-2061-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| We report measurements of ambient atmospheric mixing ratios for methyl
chavicol and determine its biogenic emission rate. Methyl chavicol, a
biogenic oxygenated aromatic compound, is abundant within and above Blodgett
Forest, a ponderosa pine forest in the Sierra Nevada Mountains of
California. Methyl chavicol was detected simultaneously by three in-situ
instruments – a gas chromatograph with mass spectrometer detector (GC-MS),
a proton transfer reaction mass spectrometer (PTR-MS), and a thermal
desorption aerosol GC-MS (TAG) – and found to be abundant within and above
Blodgett Forest. Methyl chavicol atmospheric mixing ratios are strongly
correlated with 2-methyl-3-buten-2-ol (MBO), a light- and
temperature-dependent biogenic emission from the ponderosa pine trees at
Blodgett Forest. Scaling from this correlation, methyl chavicol emissions
account for 4–68% of the carbon mass emitted as MBO in the daytime,
depending on the season. From this relationship, we estimate a daytime basal
emission rate of 0.72–10.2 μgCg−1 h−1, depending on needle age
and seasonality. We also present the first observations of its oxidation
products (4-methoxybenzaldehyde and 4-methyoxy benzene acetaldehyde) in the
ambient atmosphere. Methyl chavicol is a major essential oil component of
many plant species. This work suggests that methyl chavicol plays a
significant role in the atmospheric chemistry of Blodgett Forest, and
potentially other sites, and should be included explicitly in both biogenic
volatile organic carbon emission and atmospheric chemistry models. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|