Diel cycle impacts on the chemical and light absorption properties of organic carbon aerosol from wildfires in the western United States
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Published:2021-08-09
Issue:15
Volume:21
Page:11843-11856
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Sumlin BenjaminORCID, Fortner Edward, Lambe Andrew, Shetty Nishit J., Daube ConnerORCID, Liu Pai, Majluf Francesca, Herndon ScottORCID, Chakrabarty Rajan K.
Abstract
Abstract. Organic aerosol (OA) emissions from biomass burning have
been the subject of intense research in recent years, involving a
combination of field campaigns and laboratory studies. These efforts have
aimed at improving our limited understanding of the diverse processes and
pathways involved in the atmospheric processing and evolution of OA
properties, culminating in their accurate parameterizations in climate and
chemical transport models. To bring closure between laboratory and field
studies, wildfire plumes in the western United States were sampled and
characterized for their chemical and optical properties during the
ground-based segment of the 2019 Fire Influence on Regional to Global
Environments and Air Quality (FIREX-AQ) field campaign. Using a
custom-developed multiwavelength integrated photoacoustic-nephelometer
spectrometer in conjunction with a suite of instruments, including an
oxidation flow reactor equipped to generate hydroxyl (OH⚫) or
nitrate (NO3⚫) radicals to mimic daytime or nighttime
oxidative aging processes, we investigated the effects of multiple
equivalent hours of OH⚫ or NO3⚫ exposure on
the chemical composition and mass absorption cross-sections (MAC(λ)) at 488 and 561 nm of OA emitted from wildfires in Arizona and Oregon. We
found that OH⚫ exposure induced a slight initial increase in
absorption corresponding to short timescales; however, at longer timescales, the wavelength-dependent MAC(λ) decreased by a factor of
0.72 ± 0.08, consistent with previous laboratory studies and reports
of photobleaching. On the other hand, NO3⚫ exposure increased
MAC(λ) by a factor of up to 1.69 ± 0.38. We also noted some
sensitivity of aerosol aging to different fire conditions between Arizona
and Oregon. The MAC(λ) enhancement following NO3⚫ exposure was found to correlate with an enhancement in CHO1N and
CHOgt1N ion families measured by an Aerodyne aerosol mass spectrometer.
Funder
U.S. Department of Energy National Science Foundation National Aeronautics and Space Administration
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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