At the LaMMA laboratory the WRF-CALGRID ozone-pollution regional forecasting system has been developed, which is based on the CALGRID photochemical grid dispersion model, developed by Earth Tech Inc. and distributed by the California Air Resource Board. The system, focused on the Tuscany region, is based on two daily forecasts, one reproducing the meteorology over the study domain, and the other providing chemical boundary conditions. Meteo forecasts are performed by the WRF regional scale model, which is operative at LaMMA for the daily forecasting service, whereas boundary conditions are forecast by the CHIMERE regional chemical and transport model of the PREV'AIR European-scale air quality forecasting system. Thus, the run of the WRF-CALGRID system starts only once both meteorological and chemical forecasts are available. Each day a 96 hours simulation is run starting from 00:00 A.M. of the preceding day, which is merely used to inizialize the system. The result is then a 3-days forecasting: today, tomorrow, and the day after tomorrow. Daily meteo forecasts over the domain, performed by the WRF model at a 10 Km resolution, are scaled to the 4 Km system's final resolution through the CALMET meteo postprocessor. Chemical forecasts needed to set boundary conditions to CALGRID are provided by the CHIMERE model. Since CHIMERE uses the MELCHIOR chemical mechanism (44 species and 120 reactions) being different from the CALGRID's one, a suitable species conversion proved to be necessary to the SAPRC-90 mechanism (50 species and 129 reactions) implemented in CALGRID. Emission data over the study domain are provided by the IRSE regional emission inventory of the Tuscany region Authority. WRF-CALGRID system results are ozone daily mean and maximum concentrations over the Tuscany region. The system has been preliminary applied during the month of May 2007. Results achieved over this experimental time period showed a good accuracy level with respect to observations provided by chemical stations against local comparison has been made to. Starting from June 1st 2007, the WRF-CALGRID forecasting system is operative at LaMMA and may be accessed at the address: http://www.lamma.rete.toscana.it/ eng/aria/index_concO3_d0.html.
Presso il laboratorio LaMMA è stato realizzato il sistema di previsioni regionali dell'inquinamento da ozono WRF-CALGRID, basato sul modello di dispersione fotochimico a griglia CALGRID, sviluppato dalla Earth Tech Inc. e distribuito dalla California Air Resource Board. Il sistema, incentrato sul territorio della regione Toscana, si basa su due previsioni giornaliere, una per ricostruire la meteorologia all'interno del dominio di studio e l'altra per definire le condizioni chimiche al contorno. Le previsioni meteo sono fornite dal modello a scala regionale WRF, operativo presso il LaMMA per il servizio di previsioni giornaliere, mentre le condizioni al contorno previste sono quelle del modello di chimica e trasporto regionale CHIMERE del servizio di previsioni della qualità dell'aria a scala europea PREV'AIR. L'inizio del run del sistema WRF-CALGRID avviene quindi solo dopo che entrambe le previsioni (quella meteo e quella chimica) risultano disponibili. Ogni giorno viene eseguita una simulazione di 96 ore a partire dalle ore 00:00 del giorno precedente, utilizzato unicamente per inizializzare il sistema; il risultato è quindi una previsione a 3 giorni: oggi, domani e dopodomani. Le previsioni meteo giornaliere all'interno del dominio, fornite dal modello WRF alla risoluzione di 10 Km, vengono riscalate attraverso il postprocessore meteo CALMET alla risoluzione finale di calcolo di 4 Km. Le previsioni chimiche necessarie a definire le condizioni al contorno per CALGRID sono fornite dal modello CHIMERE. Poiché tale modello utilizza il meccanismo chimico MELCHIOR (44 specie e 120 reazioni), è stato necessario effettuare la conversione di tali specie in quelle del meccanismo SAPRC-90 (50 specie e 129 reazioni) implementato in CALGRID. Le emissioni all'interno del dominio sono fornite dall'inventario regionale IRSE della Regione Toscana. In uscita il sistema WRF-CALGRID produce la previsione delle concentrazioni medie e massime giornaliere di ozono sulla regione Toscana. Il sistema è stato applicato preliminarmente nel mese di Maggio 2007. I risultati ottenuti in questo periodo sperimentale hanno mostrato un soddisfacente livello di confidenza rispetto alle misure delle stazioni chimiche con le quali è stato effettuato il confronto puntuale. A partire dall'1 giugno 2007, il sistema WRF-CALGRID risulta operativo presso il LaMMA ed è consultabile all'indirizzo: http://www.lamma.rete.toscana.it/ ita/aria/index_concO3_d0.html.
WRF-CALGRID: Un sistema di previsioni giornaliere dell'inquinamento da ozono in Toscana
Giovanni Gualtieri
2008
Abstract
At the LaMMA laboratory the WRF-CALGRID ozone-pollution regional forecasting system has been developed, which is based on the CALGRID photochemical grid dispersion model, developed by Earth Tech Inc. and distributed by the California Air Resource Board. The system, focused on the Tuscany region, is based on two daily forecasts, one reproducing the meteorology over the study domain, and the other providing chemical boundary conditions. Meteo forecasts are performed by the WRF regional scale model, which is operative at LaMMA for the daily forecasting service, whereas boundary conditions are forecast by the CHIMERE regional chemical and transport model of the PREV'AIR European-scale air quality forecasting system. Thus, the run of the WRF-CALGRID system starts only once both meteorological and chemical forecasts are available. Each day a 96 hours simulation is run starting from 00:00 A.M. of the preceding day, which is merely used to inizialize the system. The result is then a 3-days forecasting: today, tomorrow, and the day after tomorrow. Daily meteo forecasts over the domain, performed by the WRF model at a 10 Km resolution, are scaled to the 4 Km system's final resolution through the CALMET meteo postprocessor. Chemical forecasts needed to set boundary conditions to CALGRID are provided by the CHIMERE model. Since CHIMERE uses the MELCHIOR chemical mechanism (44 species and 120 reactions) being different from the CALGRID's one, a suitable species conversion proved to be necessary to the SAPRC-90 mechanism (50 species and 129 reactions) implemented in CALGRID. Emission data over the study domain are provided by the IRSE regional emission inventory of the Tuscany region Authority. WRF-CALGRID system results are ozone daily mean and maximum concentrations over the Tuscany region. The system has been preliminary applied during the month of May 2007. Results achieved over this experimental time period showed a good accuracy level with respect to observations provided by chemical stations against local comparison has been made to. Starting from June 1st 2007, the WRF-CALGRID forecasting system is operative at LaMMA and may be accessed at the address: http://www.lamma.rete.toscana.it/ eng/aria/index_concO3_d0.html.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
