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Urban Meteorology

Urban Meteorology. S. E. Belcher Department of Meteorology, University of Reading A. Agusti-Panareda, J. F. Barlow, M. J. Best, O. Coceal, S. L. Gray, I. N. Harman,. Snapshot of current UK science Urban Meteorology Dispersion in urban areas 10 presentations, 90 attendees.

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Urban Meteorology

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  1. Urban Meteorology S. E. Belcher Department of Meteorology, University of Reading A. Agusti-Panareda, J. F. Barlow, M. J. Best, O. Coceal, S. L. Gray, I. N. Harman,

  2. Snapshot of current UK science • Urban Meteorology • Dispersion in urban areas • 10 presentations, 90 attendees Urban Meteorology at Reading

  3. UWERN Strategy • Grand science challenge: To develop scientific understanding to • Forecast air quality up to 5 days ahead • Assimilates observations from the air quality network Urban Meteorology at Reading

  4. ln(z) Mixed layer Logarithmic velocity profile Surface layer Roughness sub-layer Representation in NWP • Urban energy balance • Friction drag Surface layer: • z0andd • LMOand H Urban Meteorology at Reading

  5. Street circulations • Hall Farm • Salfex • DAPPLE Louka, Belcher & Harrison 2000 Urban Meteorology at Reading

  6. Ventilation from streets Lab technique Barlow & Belcher 2002; Barlow, Belcher & Harman; Harman, Barlow & Belcher Urban Meteorology at Reading

  7. y h x Urban canopy model Belcher, Jerram & Hunt; Coceal & Belcher Spatially averaged flow Neighbourhood scale Urban Meteorology at Reading

  8. Mixing and transport by fronts Ventilation of boundary layer by: • Warm and cold conveyor belts in extratropical cyclones • Stacked slantwise convective circulations • Shear instability and turbulent mixing From Bader et al. (1995) Doppler velocity perpendicular to an approaching cold front Height (km) Range (km) From Browning et al. (2001)

  9. Summary • Street-scale • Controls ventilation of street • Controls urban energy balance • Neighbourhood scale • Bridge between street and city scales • Efficient model based on spatial average • Potential for use in NWP • Regional scale • Fronts ventilate boundary layer Urban Meteorology at Reading

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