Comparison of mass size distribution and flux of sulfate and nitrate in urban and non-urban areas
Conference
·
OSTI ID:116366
- Illinois Inst. of Tech., Chicago, IL (United States)
Atmospheric size distributions of total mass, sulfate, nitrate, ammonium, sodium, calcium and magnesium ions were measured in Chicago, Illinois (urban area) and South Haven, Michigan (non-urban area) in March 1994 using a Wide Range Aerosol Classifier System (WRACS) including Noll Rotary Impactor (NRI) and Cascade Impactor. Dry deposition fluxes were simultaneously measured with a knife edged surrogate surface containing greased myler films. Data showed that sulfate, nitrate, ammonium, sodium, calcium and magnesium ions exist in both fine and coarse particles and greater than 90% of the total flux was due to coarse particles for total mass, sulfate and nitrate. Results showed that (a) the total measured flux of particle mass and sulfate were four times higher at the urban site (Chicago), (b) the measured flux of nitrate at the urban site was two times higher than the non-urban site (c) the fine particulate nitrate concentrations were similar for both sites. Atmospheric size distribution analysis indicated that fine and coarse sulfate and nitrate particles had mass median diameter (MMD) of about 0.5 and 6.0 {micro}m, respectively while the MMD of the particle mass in urban site was at 23.6 {micro}m. Modeled percent cumulative flux of total particle mass, sulfate and nitrate in both urban and non-urban sites showed that majority of particle mass and ionic fluxes are due to particles larger than 6.8 {micro}m. Results of this study suggest that more than 99% of the total flux of particle mass and major ionic species are due to the coarse particles.
- OSTI ID:
- 116366
- Report Number(s):
- CONF-9507173--; ISBN 0-7844-0095-4
- Country of Publication:
- United States
- Language:
- English
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