Improvement and calibration of clouds in models

Apr 12 - 16, 2021 | Toulouse, France

Initially planned in Toulouse (France), the Workshop Improvement and Calibration of Clouds in Models has changed its format to an online setting. If the situation improves, some small local hubs might be feasible.

The goal of this workshop is to discuss and share the latest improvements of atmospheric parameterizations for the representation of clouds with a large attention given to the use of LES. This concerns any type of models: regional or global models with numerical weather prediction or climate applications. The presentations will be organized along the 5 following themes :

  • observations and LES for parameterization developments: systematic comparison of single-column model simulations to observations and LES on an ensemble of cases; parameterization-oriented diagnostics;
  • recent progresses in parameterizations of cloud, turbulence, convection, microphysics including coupling between parameterizations;
  • cloud radiative effects: reference computation, cloud overlap and heterogeneity issues, new development in parameterization, coupling between radiation and other parameterizations;
  • machine learning approaches for the tuning of free parameters and model improvement: in particular the use of statistical tools to provide a process-oriented calibration of parameterizations;
  • the future for the representation of clouds in models.

The workshop will be organized as 3 hours session per day switching from morning to afternoon session to at best accommodate for the different time zones and allow participation from both the US or America and Asia or Australia.
These 3-hour sessions will include a 30-min. invited talk, a 2-hour session with 10-min. individual presentations and a 30-min. discussion. There will be no poster session.

Please submit your abstract before 01 MARCH 2021. More info under: People who have already submitted an abstract can view and edit their abstract as needed and confirm that their submission is maintained.

Practical information
The workshop, in the spirit of the 2017 Delft meeting on the future of cumulus convection and the 2019 Paracon conference, is organized in the framework of the High-Tune project ( It will be organized with only one plenary session and a mixture of invited and contributed presentations.
The registration is free but mandatory.

Two tutorials will be organized on recently developed tools within the framework of High-Tune: I) a high-tune renderer: to allow for Monte-Carlo radiative computation on cloud scenes from LES and ii/ high-tune explorer: a process-based calibration tool will be proposed during the rest of the time available during the week. More information will follow shortly.

Side meetings
A side meeting on the Grey-zone intercomparison will be organized (email to and for interest). Other side meetings are welcome. The workshop organizing committee may help in spreading the information among participants, if necessary.

For more information please click here.

Image courtesy of Meteo France