Abstract
This article presents an evaluation of the performance of the urban atmospheric dispersion model (DAUMOD) in estimating nitrogen oxides (NOx) background concentrations in Copenhagen. Estimations of hourly average (averaged over a year), mean daily and mean monthly concentrations of NOx are compared with observed values for two years of data. The model slightly underestimates low hourly average values and overestimates high values. The cumulative frequency distribution of mean daily concentration obtained from model estimations is in good agreement with the obtained from observed data. We performed a statistical analysis to determine the agreement between estimated and observed concentration values. The results show that 95.8% of hourly average estimations, 86.8% of mean daily and 100% of monthly average concentrations are within a factor of two of the observed values. The normalised mean square error of predictions is +0.13 for hourly average estimations, +0.22 for mean daily values and +0.02 for monthly mean concentrations. The fractional bias values are: –0.049 for hourly mean estimations, –0.047 for mean daily values and –0.053 for monthly average estimations. The values of the statistical parameters allow us to consider that though estimations are lightly larger than the observed values, the model performance is acceptable.
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References
Arya, S. P.: 1988, Introduction to Micrometeorology, Academic Press, Inc., San Diego, California,303 pp.
Arya, S. P.: 1999, Air Pollution Meteorology and Dispersion, Oxford University Press, New York,310 pp.
Berkowicz, R.: 2000, ‘A simple model for urban background pollution’, Environ. Monit. Assess. 65,259–267.
Brechler, J.: 2000, ‘Model assessment of air-pollution in Prague’, Environ. Monit. Assess. 65, 269–276.
de Haan, P., Rotach, M. W. and Werfeli, M.: 1998, ‘Extension of an operational short-range dispersion model for applications in an urban environment’, Int. J. Veh. Des. 20, 105–114.
de Haan, P., Rotach, M. W. and Werfeli, M.: 2001, ‘Modification of an operational dispersion model for urban applications’, J. Appl. Meteorol. 40, 864–879.
Gifford, F. A. and Hanna, S. R.: 1973, ‘Modeling urban air pollution’, Atmos. Environ. 7, 131–136.
Hanna, S. R.: 1971, ‘A simple method of calculating dispersion from urban area sources’, J. Air Pollut. Control Ass. 21, 774–777.
Hanna, S., Strimaitis, D. and Chang, J.: 1991, User's Guide for Software for Evaluating Hazardous Gas Dispersion Models, Sigma Research Corp., 71 pp.
Härkönen, J., Kukkonen, J., Valkonen, E. and Karppinen, A.,: 1998, ‘The influence of vehicle emission characteristics and meteorological conditions on urban NO2 concentration, Int. J. Veh. Des. 20, 125–130.
Kousa, A., Kukkonen, J., Karppinen, A., Aarnio, P. and Koskentalo, T.: 2001, ‘Statistical and diagnostic evaluation of a new-generation urban dispersion modelling system against an extensive dataset in the Helsinki area’, Atmos. Environ. 35, 4617–4628.
Lucas, D. H.: 1958, ‘The atmospheric pollution of cities’, Int. J. Air Pollut. 1, 71–86.
Luhana, L. and Sokhi, R.: 1998, ‘Application of the Box Model (PEARL) to Simulate the Seasonal Air Quality in Urban Centres’, in Proceedings of the 11th World Clean Air Congress, IUAPPA, Vol. 1, pp. 2G–1–1–6.
Mazzeo, N. A. and Venegas, L. E.: 1991, ‘Air pollution model for an urban area’, Atmos. Resear. 26,165–179.
Olesen, H. R.: 1995, ‘The model validation exercise at Mol: Overview of results’, Int. J. Environ. Pollut. 5, 761–784.
Owen, B., Edmunds, H. A., Carruthers, D. J. and Singles, R. J.: 2000, ‘Prediction of total oxides of nitrogen and nitrogen dioxide concentration in a large urban area using a new generation urban scale dispersion model with integral chemistry model’, Atmos. Environ. 34, 397–406.
Turner, D. B.: 1964, ‘A diffusion model for an urban area’, J. Appl. Meteorol. 3, 83–91.
Turner, D. B., Irwin, J. S. and Busse, A. D.: 1985, ‘Comparison of RAM model estimates with 1976 St. Louis RAPS measurements of sulfur oxide’, Atmos. Environ. 19, 247–253.
Venegas, L. E. and Mazzeo, N. A.: 1998, ‘Urban Diffusion-Deposition Air Pollution Model’, in Proceedings of the 11th World Clean Air Congress, IUAPPA, Vol. 2, pp. 6E–4–1–6.
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Venegas, L.E., Mazzeo, N.A. An Evaluation of Daumod Model in Estimating Urban Background Concentrations. Water, Air, & Soil Pollution: Focus 2, 433–443 (2002). https://doi.org/10.1023/A:1021376510644
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DOI: https://doi.org/10.1023/A:1021376510644