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Title. MM5 studies at Wageningen University (NL). North sea. North sea. NL. NL. MM5. Radar. Jordi Vilà (Group 4). MM5 research based on 4 components: Validation with detailed observations physical processes Improving physical representations Specific research studies to understand

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  1. Title MM5 studies at Wageningen University (NL) North sea North sea NL NL MM5 Radar Jordi Vilà (Group 4)

  2. MM5 research based on 4 components: Validation with detailed observations physical processes Improving physical representations Specific research studies to understand mesoscale phenomena BSc/MSc Education

  3. Validation physical processes Land-surface schemes Planetary boundary layer schemes Deep Convection Microphysics Method: Intensive use of observations Sensitivity analysis

  4. Energy budget Partition of the sensible heat flux (H) and latent heat flux (E) depends on the soil moisture availability Rn = H + LvE + G Rn H LvE G

  5. Energy budget + Observations - MM5 results

  6. Improving physical representations Surface and boundary layer processes Entrainment Interaction land-atmosphere

  7. Are we able to improve the Nocturnal BL representation in mesoscale models? (Gert-Jan Steenveld et al., WUR) Implementation of a vegetation layer to improve representation of the surface radiative cooling Limit the turbulent mixing in stable stratifications (local scaling)

  8. Temporal evolution of the surface temperature + CASES99 Observations Continuous Standard scheme Dotted Vegetation layer Dashed Veg. layer + local mixing Best agreement with observations after introducing vegetation lager and local turbulent mixing=> Potential impact on LLJ formation Intermittent Turbulent Radiative

  9. Temporal evolution of the vertical profiles potential temperature + CASES99 Observations Cont. Standard scheme Dot. Vegetation layer Das. Veg.layer + local mixing Turbulent mixing decreases Radiative cooling is more effective

  10. Research studies: Mesoscale phenomena strongly coupled with surface and boundary layer Method: Case studies (costal fronts, cloud formation and development, ...)

  11. Development of costal fronts (September-November) (Malda et al., 2007) Frictional convergence Thermal convection Convection trigger by sea/land thermal differences (accentuated at night) Backing up of the winds due to higher roughness length

  12. Precipitation (dependence on land zo) (24-hours accumulated) zo (original ≈ 15 cm) zo=100 cm zo= 0.01 cm North sea North sea North sea NL NL NL

  13. Education ●MSc course (6 ECTS) Mesoscale Meteorlogical Modelling Learning emphasis on: To do research using mesoscale model Critical interpretation MM5 results ●Master thesis based on MM5 More info at: http://www.met.wau.nl/

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