The Annual Seminar on Physical processes in present and future large-scale models was held at ECMWF from 1 to 4 September 2015
Increasingly models are being developed and used at higher resolution. However, many physical processes remain unresolved and need to be parametrized. Even the highest-resolution limited area models still need a parametrized representation of shallow convection, turbulence, microphysics, radiation and land surface processes. Schemes for deep convection and sub-grid orography will still be needed in the foreseeable future for global NWP and climate models.
The seminar gave an overview of the relevant issues. Emphasis was on the understanding, observation and representation of processes across scales. This is particularly relevant at very high-resolution where part of the process, e.g. convection and small scale orography, is resolved.
Each process was covered by few lectures in which fundamentals, parameterization and impact of the process will be presented in a pedagogical way. Additional topics are: the role of physical processes in data assimilation, verification and the representation of uncertainty in ensemble systems.
Seminar aims
The seminar is part of ECMWF's educational programme and is aimed at young scientists but also to more established scientists that want to engage more with the challenges of representing physical processes in models.
Presentations, summaries and recordings
| Tuesday 1 September | Presentation | Summary | Recording |
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Opening |
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Introduction to parametrization development |
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Fundamentals of radiation |
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Fast radiative transfer models and representation of clouds |
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Verification of radiation in large-scale models |
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Superparametrization in climate and what do we learn from high-resolution |
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Parametrized convective heating and large-scale waves |
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High-resolution forecasts of summer convection |
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| Wednesday 2 September | Presentation | Summary | Recording |
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Seamless prediction of weather and climate: an opportunity and a challenge for physical parametrization development |
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The representation of cloud microphysics in numerical weather prediction models |
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Representing subgrid heterogeneity of cloud and precipitation |
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Evaluating and improving simulation of clouds |
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Gravity waves: introduction and global view |
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Ground-based and airbourne observations of stratospheric and mesospheric gravity waves |
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Representation of sub-grid orography in models |
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| Arctic boundary layers Gunilla Svensson (Stockholm University) |
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| Thursday 3 September | Presentation | Summary | Recording |
| Impact of diffusion in stable layers and orographic drag Irina Sandu (ECMWF) |
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| PBL-cloud/convection interaction Chris Bretherton (University of Washington) |
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| Coupling between clouds and their large-scale environment: using observations to constrain models Louise Nuijens (MPI) |
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| Land surface processes and interaction with the atmosphere Paul Dirmeyer (George Mason University) |
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| Land surface schemes Aaron Boone (Meteo-France) |
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Land water and energy budgets and their impacts on extremes |
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| Representation of model uncertainties for ensemble forecasts Sarah-Jane Lock (ECMWF) |
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Linus Magnusson (ECMWF) |
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| Friday 4 September | Presentation | Summary | Recording |
| The challenges of linearized physics Philippe Lopez (ECMWF) |
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| Applications of linearized physics Marta Janisková (ECMWF) |
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| Assimilation of cloud and rain from satellite Alan Geer (ECMWF) |
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| Grid and sub-grid scale processes in tracer transport modelling Saulo Freitas (CPTEC) |
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Contact
Programme co-ordinator: Dr Anton Beljaars
Seminar administration: Karen Clarke