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An urban modelling system containing the CAR-FMI model was successfully evaluated against three measurement campaigns in London and Birmingham

An urban modelling system containing the CAR-FMI model was successfully evaluated against three measurement campaigns in London and Birmingham

Good results add more confidence to the application of the CAR-FMI model internationally.

The results of three measurement campaigns were presented. The campaigns have been undertaken at an urban roadside site in London, for more than a year and three months in 2003 - 2004 and for a year in 2008, and at an urban background site in Birmingham, U.K, for about four months in 2002. The concentrations of PM2.5, PM10, NOx and NO2 were predicted using the roadside dispersion model CAR-FMI, combined with a national U.K. emission model, a meteorological pre-processor, and measured values at urban background stations.

The agreement of the predicted and measured hourly and daily time-series has been assessed statistically for all of the campaigns and pollutants. For instance, the Indices of Agreement (IA) in all the campaigns ranged from 0.68 to 0.78, 0.87, from 0.70 to 0.80, and from 0.61 to 0.83 for PM2.5, PM10, NOx and NO2, respectively. The model performance was also assessed in terms of atmospheric stability, wind speeds and other factors.

It is useful to consider the model performance statistics for several measurement campaigns simultaneously, as some of the results were found to be specific only to one or two campaigns. The study also adds more confidence to the application of the CAR-FMI model internationally.

The spatial concentration distribution of NOx in London for 2008 has  also been presented.    

 
Fig. Predicted spatial distribution of the annual average NOx concentrations in London in 2008 (µg/m3).

More information:

Prof. Jaakko Kukkonen, Finnish Meteorological Institute, tel. + 358 505 202 684, jaakko.kukkonen@fmi.fi

Adj. prof. Ari Karppinen, Finnish Meteorological Institute, tel. +358 405 346 809, ari.karppinen@fmi.fi

Srinivas T. G. Srimath, Ranjeet Sokhi, Ari Karppinen, Vikas Singh and Jaakko Kukkonen, 2016. Evaluation of an urban modelling system against three measurement campaigns in London and Birmingham. Atmospheric Pollution Research, Available online 21 July 2016, 18 pp.

http://www.sciencedirect.com/science/article/pii/S1309104215301185

 


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