ECMWF | Reading | 13 - 16 November 2017
The workshop brought together experts in numerical weather prediction and climate modelling to discuss and propose ways forward on the modelling of physical processes in the greyzone of horizontal resolutions ranging from 1 km-10 km grid-spacing. The workshop aimed to shed light on the greyzone topic from different angles to identify novel approaches and development opportunities.
Topics discussed included the required complexity of cloud microphysics, the interaction of cloud microphysics, convection and boundary layer turbulence, the interaction with and the representation of the surface heterogeneity, including orography and vegetation over land and the sea-surface state over the ocean, and the physics-dynamics interplay with increasing resolution, including difficulties and opportunities arising from emerging HPC architectures.
These were discussed in the context of the inherent uncertainty of the above modelled processes (or of the underlying HPC hardware) and in view of ECMWF's ten year strategy to develop a 5km global ensemble.
Presentations
Monday 13 November
| Introduction Andy Brown/Nils Wedi (ECMWF) |
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| European cloud moist work so far Peter Bechtold (ECMWF) |
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NWP model tuning for the convective greyzone: operational experience at DWD and possible pathways towards the convection-resolving scale |
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| Greyzone in the Great White North: Recent developments at the Canadian Meteorological Centre Ron McTaggart-Cowan (CMC) |
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| Experiences with Convection Permitting versions of the UM Humphrey Lean (MetOffice) |
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| PBL and precipitation interaction and greyzone issues Song You Hong (KIAPS) |
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Tuesday 14 November
| Some light shed on the grey zone of turbulence Rachel Honnert (Météo-France) |
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Dynamic sub-grid modelling of an evolving CBL at grey-zone resolutions |
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| From small-scale turbulence to large-scale convection: a unified scale-adaptive EDMF parameterization Kay Sušelj (JPL) |
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On the use of a TKE equation to compute subgrid fluxes in the "Grey Zone" |
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| Entropy production as a constraint to subgrid-scale modeling: role of subgrid scales for the simulation of breaking gravity waves Almut Gassmann (IAP) |
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A new stochastic, scale-aware convection scheme for the Met Office Unified Model |
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Going through the grey zone of deep convection with the ALADIN System |
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A scale-aware convective parameterization scheme developed by KIAPS |
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| Convection in weather forecasts at 40km to 100m resolution over summer land and the tropical Atlantic Daniel Klocke/Martin Köhler (DWD) |
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| CRM and LES approaches for simulating tropical deep convection: successes and challenges Jean-Pierre Chaboureau (Laboratoire d'Aerologie) |
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| Necessity of parametrizations for convective initiations and controlling convections in high resolution cloud permitting models Tabito Hara (JMA) |
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| Numerical realization of thermal convection at kilometer scale Zbigniew Piotrowski (IMGW) |
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| Challenges in parameterization of shallow convection on kilometre scales Mirjana Sakradzija (MPI) |
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Wednesday 15 November
| Exploring stochastic model uncertainty representations Sarah-Jane Lock (ECMWF) |
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Representation of model uncertainty in a convectiOn permitting EPS - HarmonEPS |
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| The Irish Regional Ensemble (IRE): development of a convection-permitting EPS at Met Éireann Alan Hally (Met Éireann) |
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| Scale issues for atmospheric modelling at urban scale Valéry Masson (Météo-France) |
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| Orographic drag and the mountain-wave grey zone Annelize van Niekerk (Met Office) |
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| Land surface-atmosphere interaction approaching high resolution Patrick Samuelsson (SMHI) |
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| Developing a km-scale model system over the Alpine arc Oliver Fuhrer (Meteo Swiss) |
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| Simulation in the greyzone with the Finite-Volume Module of the IFS Christian Kühnlein (ECMWF) |
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| Coupling physical parameterizations to a three-dimensional spectral element model Alex Reinecke (NRL) |
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| Physics-dynamics coupling for GungHo Ben Shipway (Met Office / Gung-Ho) |
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Working group reports
| Working group 1 | |
| Working group 2 | |
| Working group 3 | |
Organising committee
Peter Bechtold, Michail Diamantakis, Richard Forbes, Martin Leutbecher, Sarah-Jane Lock, Sylvie Malardel, Irina Sandu, Nils Wedi