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Regional differences in chemical fate model outcome
Eva Webster1, Don Mackay, Antonio Di Guardo
1Canadian Environmental Modelling Centre, Trent University, 1600 West Bank Drive, Peterborough, Ontario, Canada K9J 7B8. ewebster@trentu.ca
Chemosphere
|April 15, 2004
Summary
Multimedia mass balance models assess environmental chemical fate. This study shows that region-specific landscape parameters significantly influence chemical fate predictions, improving model accuracy.
Area of Science:
- Environmental Science
- Chemical Fate and Transport
- Environmental Modeling
Background:
- Multimedia mass balance models are crucial for predicting the environmental fate of anthropogenic substances.
- Understanding model limitations, including the impact of parameter uncertainty, is essential for accurate environmental risk assessment.
- Previous research has explored variations in chemical properties, discharges, and landscape parameters, but the specific role of landscape properties in regional differences requires further examination.
Purpose of the Study:
- To investigate the influence of landscape properties on regional variations in chemical fate using multimedia mass balance models.
- To analyze the environmental fate of specific chemicals (benzo[a]pyrene, hexachlorobenzene, tetrachloroethylene, alpha-hexachlorocyclohexane, PCB 52, and atrazine) across different Canadian regions.
- To provide a description of the ChemCAN model and methods for obtaining landscape parameters to enable similar analyses elsewhere.
Main Methods:
- Utilized the ChemCAN model, a multimedia mass balance model, to simulate chemical fate in various Canadian regions.
- Examined the environmental fate of six distinct chemicals emitted individually to air, water, and soil.
- Obtained and incorporated region-specific landscape parameters into the model simulations.
Main Results:
- Region-to-region differences in chemical fate were observed, driven by the interplay of chemical properties, emission data, and landscape parameters.
- While chemical-specific differences in fate were substantial (spanning orders of magnitude), regional variations were also significant.
- The study highlights that chemical fate is not uniform across regions with differing landscape characteristics.
Conclusions:
- The quality and accuracy of regional environmental fate models can be substantially improved by employing region-specific landscape parameters.
- Landscape properties play a critical role in controlling region-to-region differences in the environmental behavior of chemicals.
- Accurate regional assessments necessitate the integration of detailed, localized landscape data into environmental fate models.