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PT05 Atmospheric Transport and Fate
(PT077) Identifying source areas of PCBs to the Camden/Philadelphia atmosphere.
du, s1, Totten, L1, 1 Department of environmental science, Rutgers university, New Brunswick, NJ, U.S
ABSTRACT- The concentrations of polychlorinated biphenyls (PCBs) in the atmosphere of the Camden, NJ, USA, as measured by the New Jersey Atmospheric Deposition Network (NJADN), are elevated by as much as 20 times over regional background, averaging more than 3,000 pg per cubic meter. Because of these high levels, the loading of PCBs to the tidal Delaware River via wet, dry, and gaseous atmospheric deposition exceeds the entire Total Maximum Daily Load (TMDL) recently established for PCBs. Identification of the sources of these atmospheric PCBs is therefore crucial to the implementation of the TMDL. A probabilistic model called the Potential Source Contribution Function (PSCF), which combines the 84 PCB concentration measurements at Camden with their air parcel back trajectories, has been used to estimate atmospheric source regions of PCBs to the Camden site. Hourly wind trajectories were calculated with the NOAA HYSPLIT model. Trajectory end points were superimposed on a 0.1 by 0.1 degree latitude and longitude grid (approximately 8 km square). The PSCF model was applied to both the sum of PCBs and the PCB homologue data. Preliminary results from these PSCF plots indicated that the source contribution to PCBs measured in Camden is in the direction of west and south of Camden. Furthermore, PSCF plots show high probabilities in the area within 16km of the sampling site, indicating a strong local influence from Philadelphia metropolitan area. In the near future, the PSCF model will be performed using the results from Positive Matrix Factorization (PMF) analysis of the PCB concentration data, which should allow the identification of source regions of individual aroclors in the Camden/Philadelphia area.
Key words: PCB, PSCF model
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