The online coupled 3-dimensional meteorology-chemistry model MCCM is used 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. 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).
MCCM has been developed at the IMK-IFU on the basis of the non hydrostatic NCAR/Penn State University meteorological model MM5. 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.
Validation studies with MCCM have shown its ability to reproduce observed meteorological quantities and pollutant concentrations for different conditions and regions of the earth.
|Regional air quality simulation: |
Anual mean of simulated NO2 concentration in the upper Inn Valley
Regional air quality simulation:
|Regional climate chemistry simulation:|
Difference in mean ozone maximum between future and present day climate conditions
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.
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
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.)
Haas, E., R. Forkel, P. Suppan (2005) Application, intercomparison of the RADM2, RACM atmospheric chemistry mechanism including a new isoprene degradation scheme within the online-coupled regional meteorology chemistry model MCCM, 10th conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Crete 2005; Extended Abstract.
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
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