NASA ADS: First results from a large, multi-platform study of t...
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First results from a large, multi-platform study of
trace gas and particle emissions from biomass burning
Burling, I. R.; Yokelson, R. J.; Akagi, S. K.; Johnson, T. J.; Griffith, D. W.; Urbanski, S. P.; Taylor, J. W.;
Craven, J. S.; McMeeking, G. R.; Roberts, J. M.; Warneke, C.; Veres, P. R.; de Gouw, J. A.; Gilman, J. B.;
Kuster, W. C.; Hao, W. M.; Weise, D.; Coe, H.; Seinfeld, J.
American Geophysical Union, Fall Meeting 2010, abstract #A23C-03
We report preliminary results from a large, multi-component study focused on North American
biomass burning that measured both initial emissions and post-emission processing. Vegetation types
burned were from the relatively less-studied temperate region of the US and included chaparral, oak
savanna, and mixed conifer forest from the southwestern US, and pine understory from the
southeastern US. These vegetation types are commonly managed with prescribed burning. In a
laboratory component, vegetation samples collected from the southeastern and southwestern US were
burned under “realistic” conditions at the USDA Forest Service’s Fire Sciences Laboratory in
Missoula, MT. The smoke emissions were measured with a comprehensive suite of state-of-the-art
trace gas and particle instruments. The University of Montana open-path Fourier transform infrared
(FTIR) system measured many trace gases and additional instruments (some deployed in smoke for
the first time) allowed measurements of over 150 additional non-methane organic compounds
(NMOC). A subsequent field campaign featured ground-based sampling of smoldering emissions in
North Carolina with FTIR and airborne measurements of initial emissions and plume aging in
California, Arizona, and North Carolina on a Twin Otter aircraft outfitted with airborne FTIR, aerosol
mass spectrometer (AMS), single particle soot photometer (SP2), nephelometry, and whole-air
sampling from November 2009 - March 2010. The laboratory fire studies revealed large initial
emissions of HONO and high molecular weight gas-phase NMOC. Airborne FTIR confirmed the
laboratory observations of large emissions of HONO (HONO/NOx ~ 0.1) and heavy NMOC from the
field fires and documented fast formation of PAN, organic acids, ozone, and rapid loss of several
precursors. Changes in aerosol properties and composition with aging were also observed in our
California airborne measurements.
Keywords: [0322] ATMOSPHERIC COMPOSITION AND STRUCTURE / Constituent sources and sinks, [0365]
ATMOSPHERIC COMPOSITION AND STRUCTURE / Troposphere: composition and chemistry, [0368]
ATMOSPHERIC COMPOSITION AND STRUCTURE / Troposphere: constituent transport and chemistry, [0426]
BIOGEOSCIENCES / Biosphere/atmosphere interactions
The ADS is Operated by the Smithsonian Astrophysical Observatory under NASA Grant NNX09AB39G
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