Abstract
Aerosol size distributions are presented for a winter intensive study at the Fresno Supersite. The size distributions were consistent with and predictive for continuous PM2.5 measured by beta attenuation. They varied temporally with respect to source type and intensity, with the smallest mean diameters associated with high NOx concentrations during weekday morning rush hours. Conversely, small and large particle and black carbon (BC) concentrations were higher during Sunday and weekday evenings in response to traffic and residential wood combustion emissions. Ambient PM2.5 light scattering (Bsp) was precisely but systematically underestimated during winter, probably because of heating in the sample shelter.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 822-827 |
| Number of pages | 6 |
| Journal | Journal of the Air and Waste Management Association |
| Volume | 52 |
| Issue number | 7 |
| DOIs | |
| State | Published - 2002 |
| Externally published | Yes |
Bibliographical note
Funding Information:This work is supported by the California Air Resources Board, which supplies several instrument systems, field support, space, utilities, and data management. Advanced measurements are supported under cooperative agreements with EPA and with EPA support through the Co-operative Institute for Atmospheric and Terrestrial Applications of the National Oceanic and Atmospheric Administration.