SOUTHERN FINE PARTICULATE MONITORING PROJECT

Williamson, Ashley D.

National Energy Technology Laboratory (U.S.)

关键词: Origin;    Particulates;    Light Scattering;    Sulfates;    Air Pollution Monitors;   

DOI  :  10.2172/791700
RP-ID  :  FC26-00NT40770--04
RP-ID  :  FC26-00NT40770
RP-ID  :  791700

美国|英语

来源: UNT Digital Library

【 摘 要 】

This quarterly report presents results and analysis of continuous onsite ambient fine particulate data at the North Birmingham study site during the July-September, 2000 study period. The continuous data include PM{sub 2.5} mass concentrations measured by TEOM, particle sulfate using the R&P 8400S sulfate monitor, particle size distributions measured by SMPS and APS monitors, and PM{sub 2.5} light scattering extinction coefficient as measured by nephelometer. The report also presents some initial notes on our operating experience with the 8400S sulfate analyzer. As described in the previous quarterly report, some persistent daily trends are seen in the particulate data, superimposed on a seasonal trend toward higher concentrations in warmer months. The sulfate mass fraction shows a markedly different time of day pattern from the balance of the particle mass, confirming the independent origin of this major mass fraction. The time variability of the major mass-bearing size fractions, and of the light-scattering potential, do not allow for a clean separation of independent size fractions. However, when the particle number averages are examined, the stronger time of day dependence of the smaller size fractions becomes more apparent, consistent with periods of higher formation of sub-100nm particles in early morning and in afternoon-evening periods.