WRF-Chem modelling

For SAMIRA the Weather Research and Forecasting (WRF) model coupled with Chemistry (WRF-Chem) [Grell et all., 2005] is run in order to provide input data for several SAMIRA products: the AOD to PM2.5 conversion, the Data fusion, Downscaling and the pre-operational PM forecast system.

The WRF-Chem model is run in multiple configurations focusing on providing various resolution outputs for PM2.5, PM10, SO2 and NO2 based on TNO MACC emissions inventory and ECWMF NWP inputs.

Data will be outputted for 3 nested domains (see Fig. 1) at 15 km (European), 5 km (national), and 1 km (regional) resolution for:

Fig. 1: SAMIRA modelling domains
Fig. 1: SAMIRA modelling domains
  • Romania (5 km x 5 km), Bucharest region and the Gorj county (1 km x 1 km)
  • Norway (5 km x 5 km) and Oslo region (1 km x 1 km)
  • Poland and Czech Republic (5 km x 5 km); Prague, Warsaw and the Silesia regions (1 km x 1 km)

 

 

The European territory is modelled at 5 km horizontal resolution (approx. 30‐65°N and 21°W‐ 45°E;  668 x 651 grid points) and hourly temporal resolution.  As an example in Fig. 2. the WRF-Chem output showing NO2 mixing ratio for the 03.09.2014 at 17:00.

Fig. 2: WRF Chem hourly output for NO2 mixing ratio (ppmv) 03.09.2014 17:00
Fig. 2: WRF Chem hourly output for NO2 mixing ratio (ppmv) 03.09.2014 17:00

References: Grell et al. / Atmospheric Environment 39 (2005) 6957–6975