165871 dispersion conditions in complex terrain - a case study of the january 2010 air pollution...
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165871
Dispersion conditions in complex terrain - a case study of the January 2010 air pollution
episode in Norway
Viel Ødegaard
Norwegian Meteorological Institute
Aftenposten
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Viel Ødegaard, Norwegian Meteorological Institute met.no
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Viel Ødegaard, Norwegian Meteorological Institute met.no
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Viel Ødegaard, Norwegian Meteorological Institute met.no
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Viel Ødegaard, Norwegian Meteorological Institute met.no
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Viel Ødegaard, Norwegian Meteorological Institute met.no
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Viel Ødegaard, Norwegian Meteorological Institute met.no
Temperature at different elevations
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Viel Ødegaard, Norwegian Meteorological Institute met.no
Near surface temperature gradient observations
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Viel Ødegaard, Norwegian Meteorological Institute met.no
10 m wind, observed
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Viel Ødegaard, Norwegian Meteorological Institute met.no
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
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Surface energy balance
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Model temperature profiles (UM 1km)
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Viel Ødegaard, Norwegian Meteorological Institute met.no
Oslo
Bergen
Comparing temperature in the free atmosphere with 2m temperature at same elevation
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Viel Ødegaard, Norwegian Meteorological Institute met.no
Model near surface inversion
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Viel Ødegaard, Norwegian Meteorological Institute met.no
2d trajectorieslowest level
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Viel Ødegaard, Norwegian Meteorological Institute met.no
2d trajectorieslowest level
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Viel Ødegaard, Norwegian Meteorological Institute met.no
2d trajectorieslowest level
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Viel Ødegaard, Norwegian Meteorological Institute met.no
10 m wind
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Viel Ødegaard, Norwegian Meteorological Institute met.no
Lowest level wind speed blue: > 2 m/s red: < 2 m/s
1 kmresolution
0.33 kmresolution
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Viel Ødegaard, Norwegian Meteorological Institute met.no
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
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Viel Ødegaard, Norwegian Meteorological Institute met.no
Thank you for your attention
Acknowledgement to Leiv Håvard Slørdal at the Norwegian Institute for Air Research