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Investigating Aerosol-Radiation Feedbacks in high-emission areas using WRF/CHEM Model

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Investigating Aerosol-Radiation Feedbacks in high-emission areas using WRF/CHEM Model

Il lavoro presenta la prima applicazione di un sistema modellistico per la valutazione della qualità dell’aria basato sul modello accoppiato meteorologico-chimico WRF/Chem. Il modello è stato applicato sul dominio italiano ed ha permesso di valutare degli effetti diretti ed indiretti degli aerosol sulle principali variabili meteorologiche e di queste sulle concentrazioni di inquinanti.

Aerosols are known to affect both weather and climate. The scattering of solar and terrestrial radiation by aerosol particles exerts a direct radiative forcing on climate system (“direct effect”). Additionally, aerosols, serving as cloud condensation nuclei, modified microphysical and optical properties of clouds and then precipitations (“indirect effect”). Also climate can influence air quality. The impact of climate on air quality may affect future air quality policy planning, especially in urban areas, through modifications of gas-phase chemistry, transport, diffusion, removal processes and natural emissions. Although the existence of these mechanisms has been documented in recent years, only few studies considered the interactions between aerosols and meteorology in air quality simulations over Europe.In order to evaluate the effect of direct and indirect effects of aerosols on meteorological variables, numerical simulations of the Weather Research and Forecasting/Chemistry model (WRF/Chem) have been performed over the Italian Peninsula for both a winter and summer episode of the year 2005. Three WRF/Chem simulations have been compared in order to investigate aerosols-radiation feedbacks and their effect on clouds and precipitation. For each simulation, the influence of the different model formulations is presented and discussed as well as the effects on meteorological processes and PM10 concentrations.

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