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Conference Paper

Convection in global models: tropical cyclones, waves, organisation in trades and cold air outbreaks; the parametrised versus grid-scale representation challenge

Authors

Bechtold,  Peter
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Becker,  Tobias
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Bechtold, P., Becker, T. (2023): Convection in global models: tropical cyclones, waves, organisation in trades and cold air outbreaks; the parametrised versus grid-scale representation challenge, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3110


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020316
Abstract
The representation of convection in global models strongly depends on the physical parametrizations, the model resolution and to a lesser extent on the dynamical core. We will present using the ECMWF IFS model challenges in representing convective systems in the 30-3 km resolution range such as tropical cyclones, African squall lines, large-scale tropical waves, shallow convective organisation and winds in the trades. We still largely rely on parametrized convection, but will also discuss the corresponding results with explicit deep convection. For more robust results, we also use the ensemble approach with perturbed physics parameters. No real predictability leap yet, but who knows in the future.