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Atmospheric modelling activities inside the Danish AMAP program

Jesper H. Christensen NERI-ATMI, Frederiksborgvej 399 4000 Roskilde. Atmospheric modelling activities inside the Danish AMAP program.

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Atmospheric modelling activities inside the Danish AMAP program

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  1. Jesper H. Christensen NERI-ATMI, Frederiksborgvej 399 4000 Roskilde Atmospheric modelling activities inside the Danish AMAP program

  2. The model work is financially supported by the Danish Environmental Protection Agency with means from the MIKA/DANCEA funds for Environmental Support to the Arctic Region It is a part of the Danish contribution to the international AMAP programme Purpose: Study the long-range transport in the troposphere of pollutants into the Arctic Developed since 1990. In the beginning only for Sulphur, later Lead and now also with a full photochemical scheme and Mercury. The Danish Eulerian Hemispheric Model (DEHM) System

  3. Direct coupling to ECMWF data, no MM5 meteorological preprocessor Simplified linear sulphur chemistry The Danish Eulerian Hemispheric Model in 1. Phase of AMAP

  4. The Danish Eulerian Hemispheric Model (DEHM) System

  5. Hydrostatisk version (version 2) 150 km resolution at 60° N, 50 km for nested domain 97x97 horizontal grid-points (for mother domain and 100x100 horizontal gridpoints for nested domain) and 20 vertical layers Mixed Phase (Reisner) explicit moisture Betts-Miller cumulus parametrization MRF boundary layer parametrization with 5 layer soil model Cloud-radiation scheme MM5 model

  6. Input data: Met data from ECMWF, 2.5°x2.5° lat-lon, 12 hour resolution, 21 years data from 1979 to 2000 Output every 3 hours Only run for 1990 to 2000 for hemispheric domain and for 1995 and 1998 to 2000 for Europe (50 km) 1 month for Greenland (50 km) as demonstration

  7. Full three dimensional advection-diffusion equations 150 km grid resolution (Mother domain) 20 vertical levels up to 16 km Dry deposition based on the resistance method with 8 different surfaces Wet deposition based on scavenging coefficients Numerical methods: Horizontal advection: Accurate Space Derivatives with non-periodic boundary conditions and 2-way nesting capabilities Vertical advection: Finite Elements Diffusion: Finite Elements The Danish Eulerian Hemispheric Model

  8. Nested version of DEHMa demonstration with the simplified sulphur version 150 km resolution 50 km resolution

  9. The monthly mean concentrations for SOX 150 km resolution 50 km resolution

  10. Mercury model with GKSS chemistry Gas phase pollutants: Hg0 , HgO, HgCl2 and particulate Hg 9 aqueous phase pollutants Chemistry depending on O3, SO2, Cl- and Soot During the polar sunrise in the Arctic an additional fast oxidation rate of Hg0 to HgO is assumed Mercury version of DEHM From Petersen et al. (1998) • Wet removal rates for all aqueous phase pollutants as for Sulphate • Dry deposition velocity for HgO and HgCl2 as for HNO3 and for particulate Hg as for Sulphate

  11. Examples of results with mercury model

  12. Pollutants: 54 species, more than 110 chemical reactions, chemistry scheme similar to the EMEP oxidant model Emissions: Global GEIA emissions of anthropogenic emissions of SOX and NOX, NOX from lightning and soil and Isoprene form vegetation, all on 1°x 1° global EDGAR inventory on 1°x 1° for anthropogenic hydrocarbons SOX and NOX for Europe from EMEP Has been run for whole 1998 Photochemical version of DEHM

  13. Improvement of the parameterization of the chemistry compared to the simple sulfur model Provided necessary input concentrations for the Mercury model Be a useful contribution for the understanding of the atmospheric chemistry in the Arctic, especially during the Polar Sunrise in connection with field measurements Provided necessary hemispheric background concentrations for the regional models, e.g. for Europe Purpose with the photochemical version

  14. Results from chemical version NO2mean concentrations

  15. Ozone mean concentrations

  16. Example of ozone transport into theNorth Atlantic

  17. Some validations

  18. Ozone in the Arctic

  19. Continuing the work with parameterization of background chemistry, coupling with aqueous chemistry Nested model calculations for Europe Improve parameterization of Arctic chemistry, coupling with GOME measurement of BrO, coupled to measurements in the Arctic in order to understand the spatial and temporal distribution of the depletion Ongoing activities and future work From Richter et al. (1997)

  20. The model work is financially supported by the Danish Environmental Protection Agency with means from the MIKA/DANCEA funds for Environmental Support to the Arctic Region ACKNOWLEDGEMENTS

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