Investigating biomass burning aerosol morphology using a laser imaging nephelometer
Katherine M. Manfred,Katherine M. Manfred,Rebecca A. Washenfelder,Nicholas L. Wagner,Nicholas L. Wagner,Gabriela Adler,Gabriela Adler,Frank Erdesz,Frank Erdesz,Caroline C. Womack,Caroline C. Womack,Kara D. Lamb,Kara D. Lamb,Joshua P. Schwarz,A. Franchin,A. Franchin,Vanessa Selimovic,Robert J. Yokelson,Daniel M. Murphy +18 more
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TLDR
In this paper, a laser imaging nephelometer was deployed at the Missoula Fire-Sciences Laboratory to sample biomass burning aerosol from controlled fires during the FIREX intensive laboratory study.Abstract:
. Particle morphology is an important parameter affecting aerosol
optical properties that are relevant to climate and air quality, yet it is
poorly constrained due to sparse in situ measurements. Biomass burning is a
large source of aerosol that generates particles with different morphologies.
Quantifying the optical contributions of non-spherical aerosol populations is
critical for accurate radiative transfer models, and for correctly
interpreting remote sensing data. We deployed a laser imaging nephelometer at
the Missoula Fire Sciences Laboratory to sample biomass burning aerosol from
controlled fires during the FIREX intensive laboratory study. The laser
imaging nephelometer measures the unpolarized scattering phase function of an
aerosol ensemble using diode lasers at 375 and 405 nm. Scattered light from
the bulk aerosol in the instrument is imaged onto a charge-coupled device
(CCD) using a wide-angle
field-of-view lens, which allows for measurements at 4–175 ∘
scattering angle with ∼ 0.5 ∘ angular resolution. Along with a
suite of other instruments, the laser imaging nephelometer sampled fresh
smoke emissions both directly and after removal of volatile components with a
thermodenuder at 250 ∘ C. The total integrated aerosol scattering
signal agreed with both a cavity ring-down photoacoustic spectrometer system
and a traditional integrating nephelometer within instrumental uncertainties.
We compare the measured scattering phase functions at 405 nm to theoretical
models for spherical (Mie) and fractal (Rayleigh–Debye–Gans) particle
morphologies based on the size distribution reported by an optical particle
counter. Results from representative fires demonstrate that particle
morphology can vary dramatically for different fuel types. In some cases, the
measured phase function cannot be described using Mie theory. This study
demonstrates the capabilities of the laser imaging nephelometer instrument to
provide realtime, in situ information about dominant particle morphology,
which is vital for understanding remote sensing data and accurately
describing the aerosol population in radiative transfer calculations.read more
Citations
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Aerosol optical properties and trace gas emissions by PAX and OP-FTIR for laboratory-simulated western US wildfires during FIREX
Vanessa Selimovic,Robert J. Yokelson,Carsten Warneke,James M. Roberts,Joost A. de Gouw,James Reardon,David W. T. Griffith +6 more
TL;DR: In this paper, the authors report emission factor (EF, grams of compound emitted per kilogram of fuel burned) measurements in fresh smoke of a diverse subset of critically important trace gases measured using open-path Fourier transform infrared spectroscopy (OP-FTIR).
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Modeling Atmosphere-Ocean Radiative Transfer: A PACE Mission Perspective
Jacek Chowdhary,Peng-Wang Zhai,Emmanuel Boss,Heidi M. Dierssen,Robert Frouin,Amir Ibrahim,Zhongping Lee,Lorraine Remer,Michael S. Twardowski,Feng Xu,Xiaodong Zhang,Xiaodong Zhang,M. Ottaviani,William Reed Espinosa,Didier Ramon +14 more
TL;DR: In this paper, the authors summarized the research frontiers on radiative transfer (RT) in coupled atmosphere-atmosphere systems to enable new science and specifically to support simulations and interpretations of remote sensing observations from the upcoming Plankton, Aerosol, Cloud ocean Ecosystem (PACE) mission.
Journal ArticleDOI
The nitrogen budget of laboratory-simulated western US wildfires during the FIREX 2016 Fire Lab study
James M. Roberts,Chelsea E. Stockwell,Chelsea E. Stockwell,Robert J. Yokelson,Joost A. de Gouw,Joost A. de Gouw,Joost A. de Gouw,Yong Liu,Vanessa Selimovic,Abigail R. Koss,Kanako Sekimoto,Kanako Sekimoto,Kanako Sekimoto,Matthew M. Coggon,Matthew M. Coggon,Bin Yuan,Bin Yuan,Bin Yuan,Kyle J. Zarzana,Kyle J. Zarzana,Kyle J. Zarzana,Steven S. Brown,Cristina Santín,Stefan H. Doerr,Carsten Warneke,Carsten Warneke +25 more
TL;DR: In this article, the authors used positive matrix factorization (PMF) to examine the systematics of nitrogen emissions from 75 stack fires in western US wildfires and found that CO2 is recommended as a marker for Nr emissions.
Emissions of trace gases and aerosols during the open combustion of biomass in the laboratory - eScholarship
TL;DR: McMeeking et al. as mentioned in this paper studied the emissions of trace gases and aerosols during the open combustion of biomass in the laboratory of the University of Manchester in the UK and found that the amount of aerosols and gases emitted by open combustion was higher than that of a closed combustion.
Journal ArticleDOI
Precise size distribution measurement of aerosol particles and fog droplets in the open atmosphere
TL;DR: The inversion results show that the method can achieve the precise measurements of aerosol particle size distribution and fog droplet size distribution, and the feasibility of measurement in the real atmosphere is analyzed and discussed.
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