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Viel Ødegaard Norwegian Meteorological Institute

Viel Ødegaard Norwegian Meteorological Institute. Dispersion conditions in complex terrain - a case study of the January 2010 air pollution episode in Norway. Aftenposten. Temperature at different elevations. Near surface temperature gradient observations. 10 m wind, observed.

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Viel Ødegaard Norwegian Meteorological Institute

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  1. Viel Ødegaard Norwegian Meteorological Institute Dispersion conditions in complex terrain - a case study of the January 2010 air pollution episode in Norway Aftenposten

  2. Temperature at different elevations

  3. Near surface temperature gradient observations

  4. 10 m wind, observed

  5. Operational air quality forecasting UK Met Office Unified Model 1 km horizontal resolution 38 vertical levels, lowest level wind 10 m, T and q 20 m Non-hydrostatic 9 surface tiles, urban: rough concrete approach Convection and orographic roughness parameterizations turned off Experimental runs with 0.33 km horizontal resolution dispersion model and emission data base (AirQUIS) Offline hourly data on 10 model levels: u,v,T,q Tsurf, clouds, precipitation, fluxes, BL height daily forecasts for day 2 during winter months

  6. Surface energy balance

  7. Model temperature profiles (UM 1km)

  8. Oslo Bergen Comparing temperature in the free atmosphere with 2m temperature at same elevation

  9. Model near surface inversion

  10. 2d trajectories lowest level

  11. 2d trajectories lowest level

  12. 2d trajectories lowest level

  13. 10 m wind

  14. Lowest level wind speed blue: > 2 m/s red: < 2 m/s 1 km resolution 0.33 km resolution

  15. Summary Observing Large scale persistent ridge/high pressure Strong near surface inversion confined to level below 8 (10) m Large temperature increase from low to high elevated stations Low wind speed Significant local variations in wind speed and direction with the same large scale forcing Successfully modeling Inversion evolution Drainage flow Recirculation Local wind variations provided high enough resolution

  16. Thank you for your attention Acknowledgement to Leiv Håvard Slørdal at the Norwegian Institute for Air Research

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