Publications by authors named "B A Schichtel"
Absorption photometry of patterned deposits on IMPROVE PTFE filters.
J Air Waste Manag Assoc
December 2024
The IMPROVE program (Interagency Monitoring of PROtected Visual Environments) tracks long-term trends in the composition and optics of regional haze aerosols in the United States. The absorptance of red (633-nm) light is monitored by filter photometry of 24 h-integrated samples of fine particulate matter (PM 2.5).
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- * Organic aerosols were found to be the most significant contributor to PM mass, accounting for over 40% annually, with biomass smoke influencing particulate organic matter and elemental carbon levels.
- * Seasonal variations in aerosol species were notable, particularly for particulate organic matter, fine dust, and ammonium nitrate, pointing to the need for further evaluation of how urban and rural emissions affect aerosol concentrations and atmospheric conditions.
Secondary inorganic aerosols play an important role in air pollution and climate change, and their formation modulates the atmospheric deposition of reactive nitrogen (including oxidized and reduced nitrogen), thus impacting the nitrogen cycle. Large-scale and long-term analyses of secondary inorganic aerosol formation based on model simulations have substantial uncertainties. Here we improve constraints on secondary inorganic aerosol formation using decade-long in situ observations of aerosol composition and gaseous precursors from multiple monitoring networks across the United States.
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