Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-8755-2007
http://www.atmos-chem-phys-discuss.net/7/8755/2007/
http://www.atmos-chem-phys-discuss.net/7/8755/2007/acpd-7-8755-2007.html
http://www.atmos-chem-phys-discuss.net/7/8755/2007/acpd-7-8755-2007.pdf
8755
8793
2007-06-25
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
T. G. Karl
tomkarl@ucar.edu
T. J. Christian
R. J. Yokelson
P. Artaxo
W. Min Hao
A. Guenther
National Center for Atmospheric Research, Boulder, USA
University of Montana, Department of Chemistry, Missoula, USA
University of Sao Paulo, Department of Physics, Sao Paulo, Brazil
Volatile Organic Compound (VOC) emissions from fires in tropical forest
fuels were quantified using Proton-Transfer-Reaction Mass Spectrometry
(PTRMS), Fourier Transformation 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 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 H<sub>3</sub>O<sup>+</sup> 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 (>1hour-1day) 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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