Correlations between optical, chemical and physical properties of biomass burn aerosols
Article first published online: 20 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 18, September 2007
How to Cite
2007), Correlations between optical, chemical and physical properties of biomass burn aerosols, Geophys. Res. Lett., 34, L18806, doi:10.1029/2007GL030502., , , , , , , and (
- Issue published online: 20 SEP 2007
- Article first published online: 20 SEP 2007
- Manuscript Accepted: 14 AUG 2007
- Manuscript Revised: 16 JUL 2007
- Manuscript Received: 25 APR 2007
- biomass burn;
- black carbon
 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 (αap) 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 αap (1.0 − 3.5) values displayed a fuel dependence. The category with sp2 hybridization >80% had values of ω (<0.5) and αap (∼1.25) characteristic of light absorbing soot. Other categories with lower sp2 hybridization (20 to 60%) exhibited higher ω (>0.8) and αap (1.0 to 3.5) values, indicating increased absorption spectral selectivity.