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| Titel |
The Tropical Forest and Fire Emissions Experiment: method evaluation of volatile organic compound emissions measured by PTR-MS, FTIR, and GC from tropical biomass burning |
| VerfasserIn |
T. G. Karl, T. J. Christian, R. J. Yokelson, P. Artaxo, W. M. Hao, A. Guenther |
| 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. 22 ; Nr. 7, no. 22 (2007-11-28), S.5883-5897 |
| Datensatznummer |
250005264
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| Publikation (Nr.) |
 copernicus.org/acp-7-5883-2007.pdf |
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| Zusammenfassung |
| Volatile Organic Compound (VOC) emissions from fires in tropical forest
fuels were quantified using Proton-Transfer-Reaction Mass Spectrometry
(PTRMS), Fourier Transform Infrared Spectroscopy (FTIR) and gas
chromatography (GC) coupled to PTRMS (GC-PTR-MS). We investigated VOC
emissions from 19 controlled laboratory fires at the USFS (United States
Forest Service) Fire Sciences Laboratory and 16 fires during an intensive
airborne field campaign during the peak of the burning season in Brazil in
2004. The VOC emissions were dominated by oxygenated VOCs (OVOC) (OVOC/NMHC
~4:1, NMHC: non-methane hydrocarbons) The specificity of the PTR-MS
instrument, which measures the mass to charge ratio of VOCs ionized by
H3O+ ions, was validated by gas chromatography and by
intercomparing in-situ measurements with those obtained from an open path
FTIR instrument. Emission ratios for methyl vinyl ketone, methacrolein,
crotonaldehyde, acrylonitrile and pyrrole were measured in the field for the
first time. Our measurements show a higher contribution of OVOCs than
previously assumed for modeling purposes. Comparison of fresh (<15
min) and aged (>1 h–1 d) smoke suggests altered emission ratios
due to gas phase chemistry for acetone but not for acetaldehyde and
methanol. Emission ratios for numerous, important, reactive VOCs with
respect to acetonitrile (a biomass burning tracer) are presented. |
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