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Progress on an urban surface energy balance model comparison study

Progress on an urban surface energy balance model comparison study. Acknowledge: UK Met Office, Vasilis Pappas (KCL), Rob Mullen (KCL). Sue Grimmond , Martin Best, Janet Barlow King's College London, UK Met Office, University of Reading With (people participating so far):

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Progress on an urban surface energy balance model comparison study

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  1. Progress on an urban surface energy balance model comparison study Acknowledge: • UK Met Office, Vasilis Pappas (KCL), Rob Mullen (KCL) • Sue Grimmond, Martin Best, Janet Barlow • King's College London, UK Met Office, University of Reading • With (people participating so far): • J-J Baik(Korea),M Best (UK), M Bruse(Germany),I Calmet(France), A Dandou(Greece), • K Fortuniak (Poland),R Hamdi(Belgium), M Kanda (Japan), H Kondo (Japan), • S Krayenhoff (Canada), S-B Limor(Israel), A Martilli(Spain),V Masson (France), • K Oleson (USA),A Porson (UK), U Sievers (Germany),H Thompson (UK) COST-728 Exeter meeting, 3-4 May 2007

  2. Variety of Applications for Urban Energy Balance Models • For example: • Meso-scale modelling • Global climate modelling • Air quality • View factor determinations • Heat island studies • Upper boundary conditions for other models • Weather forecasting • Energy assessments • Emergency response • This Study • Suite of different models • Range of complexity • Range of applications • Range of data needs • Range of computer needs • Common: all run offline

  3. Available models Computational Requirements Too expensive to run? Globally more applicable? Parameters difficult to get? Number of Parameters

  4. Past Model Evaluations

  5. Distinct Features of Comparison

  6. Key Questions

  7. Current Status

  8. Immediate Next steps

  9. Multi-step model runs • Simulation of the components of the surface energy balance (net radiation, storage, sensible and latent heat fluxes) for the location(s) of the evaluation dataset • Four stages • Different levels of input data are released to the modellers • At each stage more information is released about the morphology and physical properties of the site • enables determination of model parameters with more accuracy • Staged approach to establish the required accuracy for each model parameter by comparing the quality of the simulation at each stage.

  10. Multi-step model runs

  11. Process-oriented statistical analysis

  12. Urban Energy Balance Models participating so far

  13. Multiple versions

  14. Methods used to model outgoingshortwave radiation

  15. Methods used to determine Anthropogenic Heat Flux

  16. What is resolved in the model?

  17. Final Comments • Models that are already participating show a wide range of approaches • Need to follow up on some details • Multiple versions of some individual models are participating • Initial trial dataset now available • Data back from three groups • This is allowing us to iron out issues at both ends • People can still participate • Encouraged to do so! Contact me: sue.grimmond@kcl.ac.uk • Participants will be co-authors in manuscripts etc • Waiting to hear if NERC will fund the next parts of this project

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