Correlations between optical, chemical and physical properties of biomass burn aerosols

Details Correlations between optical, chemical and physical properties of biomass burn aerosols Correlations between optical, chemical and physical properties of biomass burn aerosols

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3418806h&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 18, CiteID L18806

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16

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Processes: Clouds And Aerosols, Global Change: Atmosphere (0315, 0325)

Scientific paper

Aerosols generated from burning different plant fuels were characterized to determine relationships between chemical, optical and physical properties. Single scattering albedo (ω) and Angstrom absorption coefficients (α ap) were measured using a photoacoustic technique combined with a reciprocal nephelometer. Carbon-to-oxygen atomic ratios, sp2 hybridization, elemental composition and morphology of individual particles were measured using scanning transmission X-ray microscopy coupled with near-edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS) and scanning electron microscopy with energy dispersion of X-rays (SEM/EDX). Particles were grouped into three categories based on sp2 hybridization and chemical composition. Measured ω (0.4 - 1.0 at 405 nm) and α ap (1.0 - 3.5) values displayed a fuel dependence. The category with sp2 hybridization >80% had values of ω (<0.5) and α ap (~1.25) characteristic of light absorbing soot. Other categories with lower sp2 hybridization (20 to 60%) exhibited higher ω (>0.8) and α ap (1.0 to 3.5) values, indicating increased absorption spectral selectivity.

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