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Convection-permitting atmospheric modelling
Convener: Edmund Meredith  | Co-Conveners: Andreas F. Prein , Marie Piazza , Steven C. Chan , Erika Coppola , Heimo Truhetz 
 / Thu, 12 Apr, 13:30–15:00
 / Attendance Thu, 12 Apr, 17:30–19:00

This session explores recent advances in convection-permitting atmospheric modelling, with the newest generation of atmospheric models that allow for the explicit treatment of convection: regional and global models, variable resolution models (e.g. ICON, MPAS), and models using super-parametrizations.

Convection-permitting models (CPMs) have been shown to improve both the diurnal convective cycle and the representation of convective precipitation, particularly extremes. Furthermore, CPMs often exhibit important differences in climate-feedback mechanisms and climate change signals compared to models with parametrized deep convection. CPMs offer a promising tool to provide critical information to decision makers and stakeholders, especially in areas at risk of convective extremes and mountainous regions, and have thus sparked wider interest in their applications and development, for example the CORDEX Flagship Pilot Study (FPS) on convective phenomena over Europe and the Mediterranean.

This session also brings together the observational community, cloud physicists, numerical modellers, forecasters and CORDEX-FPS participants, with the aim of advancing understanding of convection in general (including convective storm life cycle and convective organization) with new modelling and statistical observation approaches. Contributions on new high-resolution/sub-daily observational datasets, and their application to CPM evaluation, are particularly welcome. The session also encourages the examination of interactions between convection and other atmospheric phenomena (e.g. boundary layers, cloud physics, radiation), as well as CPM investigations of local to regional circulations (e.g. land-ocean contrasts, flow-orography interactions, urban-rural transitions).

Other topics include, but are not limited to, model setup and parametrization, model evaluation and new evaluation metrics/methods, ensemble-based approaches to quantify uncertainties at convective scale, physical understanding of the added value compared to coarser models, land-use changes at convection-permitting scale, and application to climate studies for short and long-term simulations. Particular attention is given to the representation of extremes.