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Presentation RSE 15006833

A high resolution hybrid modelling system for the evaluation of urban concentrations

Presentation

A high resolution hybrid modelling system for the evaluation of urban concentrations 6-11 , Settembre-2015.

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G. Pirovano (RSE SpA) , A. Toppetti (RSE SpA), G. Riva (RSE SpA) , A. Balzarini (RSE SpA), N. Pepe (Politecnico di Milano), G. Lonati (Politecnico di Milano), C. Colombi (AMAT-Agenzia Mobilità Ambiente Territorio Milano), M. Bedogni (AMAT-Agenzia Mobilità Ambiente Territorio Milano)

EMOBILITY 2015 - Electric Mobility

This work describes a hybrid modelling system based on CAMx and AUSTAL2000 models, able to reconstruct both chemical processes and local dispersion that involve the main urban pollutants, whose most relevant sources are road transport and domestic heating.

Urban areas are characterized by high levels of pollution, produced mainly by anthropogenic sources. The urban morphology introduces a strong spatial variability that cannot be captured by an usual operational Air Quality network. To this aim a hybrid modelling system based on CAMx chemistry transport model AUSTAL2000 lagrangian particle model has been set up and evaluated.

The CAMx model, is used to calculate the background concentration levels due to the emissions surrounding the local scale area, but switching off the local scale emissions, thus avoiding a double counting of their contribution to the final concentration. The local scale concentrations are estimated by AUSTAL and then superimposed to CAMx background concentration in order to build the final concentration field. The introduction of the hybrid system generally yields an increase in the total modelled concentrations, in some cases improving the model performance.

The background concentration represents the prevailing contribution, with the local scale emissions yielding a greater contribution during more stagnant conditions.

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