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Analysis of Meteorology-Chemistry Interactions During Air Pollution Episodes Using Online Coupled Models Within AQMEII Phase-2

pubblicazioni - Articolo

Analysis of Meteorology-Chemistry Interactions During Air Pollution Episodes Using Online Coupled Models Within AQMEII Phase-2

Lo stato dell’arte della modellistica atmosferica è costituito da un nuovo approccio che integra i processi meteorologici e chimici, permettendo di effettuare analisi più accurate del ruolo delle diverse fonti antropiche, comprese quelle energetiche. Qui vengono analizzati i risultati ottenuti nella simulazione degli effetti di feedback.

This study reviews the top ranked meteorology and chemistry interactions in online coupled models recommended by an experts’ survey conducted in COST Action EuMetChem and examines the sensitivity of those interactions during two Russian forest fire episodes and a Saharan dust transport event. Three WRF-Chem model simulations were performed for the forest fire case for a baseline without any aerosol feedback on meteorology, a simulation with aerosol direct effects only and a simulation including both direct and indirect effects.

The results from both episodes demonstrate that it is important to include the meteorology and chemistry interactions in online-coupled models. Model evaluations using routine observations collected in AQMEII phase-2 that the simulations including only aerosol direct effects has better performance than the simulations with no aerosol feedbacks or including both direct and indirect effects. The normalized mean biases are significantly reduced by 10-20% for PM10 when including aerosol direct effects. The analysis shows that models perform worse when including both aerosol direct and indirect effects, which suggests that the representation of aerosol indirect effects needs to be improved in the model.

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