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| Titel |
Emissions and ambient distributions of Biogenic Volatile Organic Compounds (BVOC) in a ponderosa pine ecosystem: interpretation of PTR-MS mass spectra |
| VerfasserIn |
S. Kim, T. Karl, A. Guenther, G. Tyndall, J. Orlando, P. Harley, R. Rasmussen, E. Apel |
| 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 ; 10, no. 4 ; Nr. 10, no. 4 (2010-02-16), S.1759-1771 |
| Datensatznummer |
250008114
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| Publikation (Nr.) |
 copernicus.org/acp-10-1759-2010.pdf |
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| Zusammenfassung |
| Two proton-transfer-reaction mass spectrometry systems were deployed at the
Bio-hydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O,
Organics and Nitrogen-Southern Rocky Mountain 2008 field campaign
(BEACHON-SRM08; July to September, 2008) at the Manitou Forest Observatory
in a ponderosa pine woodland near Woodland Park, Colorado USA. The two
PTR-MS systems simultaneously measured BVOC emissions and ambient
distributions of their oxidation products. Here, we present mass spectral
analysis in a wide range of masses (m/z 40+ to 210+) to assess our
understanding of BVOC emissions and their photochemical processing inside of
the forest canopy. The biogenic terpenoids, 2-methyl-3-butene-2-ol (MBO,
50.2%) and several monoterpenes (MT, 33.5%) were identified as the
dominant BVOC emissions from a transmission corrected mass spectrum
(PTR-MS), averaged over the daytime (11 a.m. to 3 p.m., local time) of three
days. To assess contributions of oxidation products of local BVOC, we
calculate an oxidation product spectrum with the OH- and ozone-initiated
oxidation product distribution mass spectra of two major BVOC emissions at
the ecosystem (MBO and β-pinene) that were observed from laboratory
oxidation experiments. The majority (~76%) of the total signal in
the transmission corrected PTR-MS spectra could be explained by identified
compounds. The remainder are attributed to oxidation products of BVOC
emitted from nearby ecosystems and transported to the site, and oxidation
products of unidentified BVOC emitted from the ponderosa pine ecosystem. |
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