6th WGNE workshop on systematic errors in weather and climate models

| 31 October 2022 to 4 November 2022


The WMO (WCRP/WWRP) Working Group on Numerical Experimentation (WGNE) organises a hybrid workshop on systematic errors in weather and climate models, hosted by the European Centre for Medium Range Weather Forecasts (ECMWF) during 31st October - 4th November 2022.

The workshop brings together a wide range of experts on simulating the Earth System including atmosphere, ocean, waves, land-surface, atmospheric composition, and associated disciplines to advance the understanding of systematic simulation errors at all timescales. A particular emphasis is given to identifying errors in complex coupled systems and to understand their root causes. Progress in diagnosing and addressing systematic errors using a wide range of tools ranging from classical methods to advanced technologies such as data assimilation and machine learning / AI will be documented. The workshop will encourage an active discussion on relative merits of active development of physical models and parametrisations to address systematic errors versus bias correction methods.

The workshop will review recent progress made on the atmospheric systematic error priorities identified from the 5th Workshop on Systematic Errors, while also expanding focus to coupled systems. The workshop will be broadly organized around the following themes:

  • Clouds and precipitation: convective precipitation; sfc-fluxes and diurnal cycle; cloud microphysics; representation of low clouds, especially at high latitudes; uncertainty representation; resolved/unresolved convection; precipitation over orography.
  • Atmosphere-land-ocean-cryosphere interactions: sfc fluxes and diurnal cycle; surface drag; soil/vegetation/land-use representation; stable boundary layer issues; fog-stratus simulation; impact of coupled modeling to ocean/sea-ice/waves.
  • (sub-)tropical circulations: Tropical cyclones, MJO, QBO,  double ITCZ and ENSO biases, ocean and wave coupling, role and biases over the maritime continent, tropics and mid-latitude coupling.
  • Stratosphere-Troposphere interactions: role of stratospheric biases on longer term predictability; stratospheric bias correction and impact on predictability; atmospheric composition and long-lived tracers.
  • Machine learning/AI and data assimilation: novel techniques to diagnose, measure or resolve systematic errors.
  • Quantifying uncertainty: spread-error relationships; identifying role and contribution of physical processes to uncertainty characterization ; ensemble and hindcast strategies to identify extremes ; use of multi-model ensembles to identify systematic errors; stochastic representations of model uncertainty.
  • Challenges and surprises in simulating the climate system: improvements and new errors with eddy resolving / deep convection resolving simulations, errors due to vertical/horizontal resolution imbalances, shifts in statistical analyses due to resolved vs parametrised processes


The format of the workshop will facilitate online and physical participation and follows the previous successful workshop in Montreal in 2017

  • To participate in this workshop, it is necessary to submit an abstract, and for that abstract to be accepted
  • Assuming there are no social distancing measures in place, we could accommodate 120 physical participants; this is the maximum capacity of our facilities. There is no limitation to the number of online participants.
  • There will be a single session of oral presentations (no parallel sessions) from selected abstracts plus keynote talks of solicited speakers
  • The majority of presentations will be in the form of posters which can be discussed in dedicated online rooms and dedicated physical sessions
  • The workshop science steering committee will review and decide on acceptance.