Tools and Techniques for Identifying Contributions to PMfine and Regional Haze: Source Apportionment Techniques, CATT, and FASTNET, Presentation by Serpil Kayin (MARAMA) and Rich Poirot (Vermont DEC) - August, 2005 (Adobe Acrobat® format)
The objective of this study was to identify emissions sources contributing to fine particle concentrations and visibility impairment in rural areas in the Midwestern and eastern U.S. (see map). The final report on Phase I of the study was completed by Battelle Memorial Institute with assistance from Sonoma Technologies, Inc. It includes an independent review by Dr. John Watson of the Desert Research Institute and an analysis of related studies by Richard Poirot of Vermont’s Department of Environmental Conservation.
Phase II of the source apportionment study was intended to further extend the results of Phase I by applying additional models and data analysis techniques. Researchers at Desert Research Institute applied Principal Components Analysis (PCA), Positive Matrix Factorization (PMF) and UNMIX receptor models to identify source types and generate modeled source profiles. Time series plots and back trajectory analyses of the PMF modeled results provide complementary information on seasonal cycles (ammonium nitrate), events (dust storms, wildfires) and the provenance of pollutants and their pre-cursors. Averaged seasonal ambient data sub-sets were apportioned to the recalculated PMF modeled source profiles, by applying the Chemical Mass Balance (CMB) receptor model. Source attribution results are compared in order to establish the limitations of each model (PMF, UNMIX, CMB) and to demonstrate how they may complement each other. The modeled results are compared with source inventories, back trajectory analyses, and measured source profiles in order to compile a conceptual model for each of the four sites, and for the region being investigated.
Both Phase I and Phase II of the Source Apportionment study were jointly funded by MANE-VU and the Midwest RPO.
(All documents are in Adobe Acrobat® format)
Dr. Mei Zheng's presentation on Source Apportionment of PM2.5 in North Carolina - March, 2005
Dr. Mei Zheng's Source Apportionment of PM2.5 in North Carolina Report (November 5, 2004) - March, 2005