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MCCM (Mesoscale Climate Chemistry Model)

The online coupled 3-dimensional meteorology-chemistry model MCCM has been developed at the IMK-IFU on the basis of the non hydrostatic NCAR/Penn State University meteorological model MM5 (Grell et al., 2000). Its online coupled atmospheric chemistry part includes a choice of three different tropospheric gas phase chemistry modules (RADM  [Stockwell et al. 1990, JGR 95, 16343-18367],  RACM [Stockwell et al. 1997, JGR 102, 847-879], and RACM-MIM [Geiger et al., 2003, Atmos. Environment, 37, 1503-1519]). Optional aerosol processes are described with the modal MADE/SORGAM aerosol module (Schell et al., 2001, JGR 106, 28275-28293) which considers as single compounds sulfate, nitrate, ammonium, water, and 4 organic compounds. Biogenic VOC and NO emissions are calculated online based on land use data, simulated surface temperature and radiation. MCCM can be applied over a range of spatial scale from the regional scale (several thousand kilometres, with a horizontal resolution of 30-100 km) to the urban scale (100-200 km, resolution 1-5 km).

Validation studies with MCCM have shown its ability to reproduce observed meteorological quantities and pollutant concentrations for different conditions and regions of the earth. MCCM was extensively applied at IMK-IFU until 2010 for investigations of air quality during episodes, real time weather and air quality forecasts, as well as for the investigation of climate impact on regional air quality. It is still applied for real time weather and for air quality studies at UNAM at Mexico City. The chemistry part of MCCM was also serving as a starting point for the development of the chemistry part of WRF-Chem.

Regional air quality simulation:
Anual mean of simulated NO2 concentration in the upper Inn Valley
  Ozone difference

Regional air quality simulation:
Volcanic ash concentration about 3 km above the ground on April 17 2010, 0 UTC

Regional climate chemistry simulation:
Difference in mean ozone maximum between future and present day climate conditions



Selected References

Emeis, S., Forkel, R., Junkermann, W., Schäfer, K., Flentje, H., Gilge, S., Fricke, W., Wiegner, M., Freudenthaler, V., Groß, S., Ries, L., Meinhardt, F., Birmili, W., Münkel, C., Obleitner, F., and Suppan, P. (2011), Spatial structure and dispersion of the April 16/17, 2010 volcanic ash cloud over Germany, Atmos. Chem. Phys., 11, 2689-2701, doi:10.5194/acp-11-2689-2011.

Forkel, R. and R. Knoche (2006) Regional climate change and its impacts on photooxidant concentrations in southern Germany: Simulations with a coupled regional climate-chemistry model, J. Geophys. Res., 111, No. D12, D12302, doi:10.1029/2005JD006748 (13pp.)

Grell, G. S. Emeis, W.R. Stockwell, T. Schoenemeyer, R. Forkel, J. Michalakes, R. Knoche, W. Seidl (2000) Application of a Multiscale, Coupled MM5/Chemistry Model to the Complex Terrain of the VOTALP Valley Campaign. Atmospheric Environment, 34, 1435-1453

Grell, G.A., R. Knoche, S.E. Peckham, and S.A. McKeen (2004), Online versus offline air quality modeling on cloud-resolving scales. Geophys. Res. Letters, 31, L16117, doi: 10.1029/2004GL020175

Haas, E., R. Forkel, P. Suppan (2010) Application, intercomparison of the RADM2, RACM atmospheric chemistry mechanism including a new isoprene degradation scheme within the online-coupled regional meteorology chemistry model MCCM, Int. J. of Environment and Pollution, Vol.40, No.1/2/3, 136 - 148, DOI:10.1504/IJEP.2010.030889. Link to extended abstract(Harmo10, 2005)

Jazcilevich, A.D., A.R. Garcia, L. G. Ruiz-Suarez (2003) A study of air flow patterns affecting pollutant concentrations in the Central Region of Mexico. Atmos. Environment, 37, 183-193

Wiegner, M., Gasteiger, J., Groß, S., Schnell, F., Freudenthaler, V., Forkel, R. (2011) Characterization of the Eyjafjallajökull ash-plume: Potential of lidar remote sensing, Physics and Chemistry of the Earth. doi: 10.1016/j.pce.2011.01.006

Contact:Renate Forkel