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Evaluation of the CALINE4 and CAR-FMI models against measurements near a major road [An article from: Atmospheric Environment]
Book Details
PublisherElsevier
ISBN / ASINB000RR7VJO
ISBN-13978B000RR7VJ1
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Description
This digital document is a journal article from Atmospheric Environment, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
This study evaluates and inter-compares two atmospheric dispersion models against the results of a measurement campaign that was conducted near a major road at Elimaki in southern Finland from 15 September to 30 October 1995. The campaign was specifically designed for model evaluation purposes. The concentrations of NO"x, NO"2 and O"3 were measured simultaneously at three locations, at three heights (3.5, 6 and 10m) on both sides of the road. Traffic densities and relevant meteorological parameters were also measured on-site. The models evaluated were the Gaussian finite line source models California line source dispersion model, version 4 (CALINE4) and Contaminants in the Air from a Road-Finnish Meteorological Institute, version 3 (CAR-FMI); the latter was used in combination with the MPP-FMI meteorological pre-processing model. The agreement of measured and predicted datasets was good for both models, as measured using various statistical parameters. For instance, for the hourly NO"x and NO"2 data and predictions, analyzed separately at two distances from the road (17 and 34m), each of these at two heights (3.5 and 6m), the index of agreement values range from 0.77 to 0.88, and from 0.83 to 0.92 for the evaluations of the CAR-FMI and CALINE4 models, respectively. The performance of both models was better at a distance of 34m, compared with that at a distance of 17m. We also analyzed the difference between the model predictions and measured data in terms of the wind speed and direction. The performance of both models in most cases deteriorated as the wind speed decreased, and as the wind direction approached a direction parallel to the road.
Description:
This study evaluates and inter-compares two atmospheric dispersion models against the results of a measurement campaign that was conducted near a major road at Elimaki in southern Finland from 15 September to 30 October 1995. The campaign was specifically designed for model evaluation purposes. The concentrations of NO"x, NO"2 and O"3 were measured simultaneously at three locations, at three heights (3.5, 6 and 10m) on both sides of the road. Traffic densities and relevant meteorological parameters were also measured on-site. The models evaluated were the Gaussian finite line source models California line source dispersion model, version 4 (CALINE4) and Contaminants in the Air from a Road-Finnish Meteorological Institute, version 3 (CAR-FMI); the latter was used in combination with the MPP-FMI meteorological pre-processing model. The agreement of measured and predicted datasets was good for both models, as measured using various statistical parameters. For instance, for the hourly NO"x and NO"2 data and predictions, analyzed separately at two distances from the road (17 and 34m), each of these at two heights (3.5 and 6m), the index of agreement values range from 0.77 to 0.88, and from 0.83 to 0.92 for the evaluations of the CAR-FMI and CALINE4 models, respectively. The performance of both models was better at a distance of 34m, compared with that at a distance of 17m. We also analyzed the difference between the model predictions and measured data in terms of the wind speed and direction. The performance of both models in most cases deteriorated as the wind speed decreased, and as the wind direction approached a direction parallel to the road.
