ICON Meeting 2025/3¶
19 November 2025, ETH Zurich (L 17.1) and via Zoom
Participants (on-site)¶
Michael Jähn (MJ), Matthieu Leclair (MaL), Annika Lauber (AL), Mikael Stellio (MS), Christian Zeman (CZ), Marius Rixen (MR), Morgane Lalonde (MoL), Hernandez Urbide Santiago (HUS), Nadja Omanovic (NO)
Participants (Zoom)¶
Tina Schnadt (TSP), Matthias Kraushaar (MK), Laurenz Roither (LR), Sylvaine Ferrachat (SF), Dominik Brunner (DB), Alina Yapparova (AY), Doris Folini (DF), Corina Keller (CK), Arash Hamzehloo (AH), David Leutwyler (DL), Christian Steger (CS), Jacopo Canton (JC)
Minutes by Annika Lauber
Reports¶
C2SM (Michael Jähn, Matthieu Leclair, Annika Lauber, Mikael Stellio)¶
MJ welcomes everyone and shares the latest news about ICON from C2SM .
CZ askes whether there is a storage limit on cws01. MJ respondes that the system currently has approximately 250 TB available.
JC asks whether input data for ICON4Py can be stored there. MJ confirms that this is probably possible.
Dominik Brunner¶
MaL points out that ComIn operates in a serial manner by design and asks if no performance reduction is observed because the workload is sufficiently light. DB confirmed that the current implementation is lightweight, noting that a heavier configuration would slow the process.
SF states that ComIn is not a coupler and is not intended to serve as one, which developers regularly emphasize. DM observed that the MESSy interface nevertheless uses ComIn a coupler-like manner.
MJ asks how much effort would be required to enable ComIn to work with nested domains. DB replies that there are currently no applications requiring this functionality. He explains that the main requirement would be access to full grid information and does not expect this to be very difficult. He adds that the current setup is tailored to the Empa use case and welcomes additional users and feedback to assess whether the design is too specific.
DL asks whether a central registry of ComIn plugins exists. DB states that while ComIn selections are available, there is no central location showing which interfaces already exist, and suggestes raising this with the developers. SF states that the idea had been discussed previously and notes that Florian Prill found the concept promising, so such a registry may be developed in the future.
Christian Zeman¶
Plan to do DYOMAND run with and without convection; may already use SIROCCO.
Marius Rixen¶
Resolution-sensitivity studies for mesoscale circulation.
Morgane Lalonde¶
Development work in JSBACH.
Hernandez Urbide Santiago¶
Running model over South America at 5 km resolution; investigating why and how convection changes in the future.
Laurenz Roither¶
New PhD student in Andreas Prein's group; working with ensemble boosting in the Alps;
Corina Keller¶
Using ICON-ART for studying air-quality impact and the influence of mitigation; integrating code developments into ART master.
Arash Hamzehloo¶
Porting ART module to GPUs.
David Leutwyler¶
Working on parameter tuning for convection runs; looking at gust parametrization by Günther Zängl.
Alina Yapparova¶
Data assimilation of 3D radar reflectivity to improve precipitation forecasts.
Christian Steger¶
- Implementing new topographies in EXTPAR (including COPERNICUS dataset)
- Working on radiation topography parametrization in ICON; documentation available online now
- Sub-grid scheme implemented and ready for testing
- Investigating update of background albedo in EXTPAR; Severe artifacts have been found for complex terrain - trying to solve this
Jacopo Canton¶
- Working with high resolution urban modeling.
- Working with ICON4Py.
Doris Folini¶
Interest in idealized setups; studying extreme-event behavior under idealized conditions.