In cooperation with the Wageningen University and Research (WUR) and the Universiy of Bern we will organise our next Hackathon in October this year. It will be the 5th hackathon for the nextGEMS project and it will happen in the town of Wageningen in the Netherlands.

Mark the week of the 14th-18th of October 2024 in you calendars and keep an eye on this page for more information in the future

With a sunny morning in Hamburg (Germany), more than 130 participants attending the nextGEMS 4th km-scale Hackathon gathered at the Max Plack Institute for Meteorology (MPI-Met) on Friday, March 8th for the closing session. It started at 9:00 am, providing a space for the different thematic groups – Storms & Ocean, Storms & Land, Storms & Radiation, and Storms & Society – to share their observations, analysis, and first hacking results with everyone.

Participants at the closing hackathon session in the MPI.
Participants starting the closing session day.

Postdoctoral Researcher at the MPI-M, Arjun Kumar, summarised outcomes from the Storms & Ocean breakout groups. For instance, it was found that the Arctic sea-ice holes in the ICON model – an issue that was at the center of attention during the last days -were caused by an error, whereby the ocean does not lose momentum to the sea ice. The role of ocean eddies and tropical cyclones on the carbon cycle were also explored in a novel one-year simulation with ocean biogeochemistry. Other topics included global vertical eddy heat fluxes; tropical precipitation biases; ocean mixing; the spatial scales of air-sea interactions; and declining fish stocks in the West African coast.

On behalf of the Storms & Land group, Postdoctoral Researcher at the University of Bern, Edgar Dolores Testillos, talked about the runs made with the IFS model. The team observed more frequent atmospheric blockings in different regions of the world, like the North Pacific. An atmospheric blocking indicates that the normal west-to-east flow of the air current in the upper levels of the Earth’s atmosphere (or jet stream) is disrupted or “blocked”. Consequently, they prolong the periods of certain weather conditions regionally, like heatwaves or heavy rainfalls, which makes blockings a crucial phenomenon to understand in climate modeling and weather forecasting due to its impact on ecosystems, agriculture, and society.

Thorsten Mauritsen talking at the hacktahon.
Thorsten Mauritsen talking about the Storms & Radiation hacking results.

On another note, Thorsten Mauritsen, Researcher and Professor at University of Stockholm, shared the results from the Ocean & Radiation team, which was diversely integrated mostly by participants from outside the nextGEMS project. A highlight from the presentation were the haboobs (or sand storms) formations in the Sahara region, which were displayed in an astonishingly graphical way for the audience. Other aspects observed with the ICON model covered the low level of clouds in the Southern Ocean, and the distribution of areas where atmospheric conditions lead to the formation and release of precipitation – known as precipitation cells – that are reaching the Sahara region.

The  Storms & Society team, represented by Researcher at Barcelona Supercomputing Center, Eulália Baulenas, explained how during the hackathons knowledge is translated into action. Furthermore,  she shared the visual output that the group worked on to co-produce videos with Latest Thinking, as well as the preparation of a policy brief on km-scale modeling, which is currently in its beginning stage. Before finalizing, an important announcement was made by Project Coordinator, Heike Konow, about the future nextGEMS hackathon: it will happen in the city of Wageningen, in the Netherlands, from the 14th-18th of October 2024.

Heike Konow holding a presentation about the hackathons.
Heike Konow holding a presentation about the nextGEMS hackathons.

Lastly, as a final wrap-up, the hackathon community converged its knowledge in the final discussion panel, led by Bjorn Stevens, Managing Director of the MPI-Met. During this dialogue, the participants had the opportunity to address concerns about the Earth system models, the outputs, and the climate data, as well as ideas for future collaborative scientific publications and experiments.

From the 4th to the 8th of March 2024, the portuary city of Hamburg (Germany) will host our upcoming 4km-scale Hackathon. This is the fourth hackathon of the nextGEMS project, and this year it will be co-organized by two other climate modelling projects: European Eddy-Rich ESMs (better known as EERIE) and WarmWorld. The event will mainly take place in the Max Plack Institute  (MPI) for Meteorology, and some sessions will happen in the buildings of the University of Hamburg, the Geomatikum, and the Pharmacy building.

As an exploratory hacking marathon – commonly known as a hackathon, our event will bring together professionals and experts from a wide variety of areas within the climate science field to find and fix bugs in the existing models and work on extrapolating current and past data to create future scenarios. Overall, the 4km-scale hackathon will provide an environment where the participants can programme, model, collaborate, and exchange ideas.

In addition to the model development during the hacking periods, the occasion will also supply a space for the diffusion of knowledge. Daniel Klocke and Thomas Rackow will talk about the Earth System models used in nextGEMS: ICON and IFS – respectively. Moreover, there will be two keynotes: one by the meteorologist Daniela Jacobs about the Earth Visualisation Engines (EVE) for climate initiative, and another by Climate Physics Director at MPI, Sarah Kang, about the possible shift in mechanistic controls of tropical Pacific surface warming pattern. In case you were not already hooked by that, two special side events will also take place with the immersive experience of visiting the Wind Tunnel at the University of Hamburg and the DKRZ supercomputer Levante.

All the information about the venue, transportation, accommodation, programme, and getting ready is gathered online on the hackathon’s official website. In case you are interested in our previous hackathons, you are able to find more information about them on the nextGEMS official website. Furthermore, we will be giving live updates about the event on our Mastodon and LinkedIn accounts, so don’t forget to follow us and stay tunned! Do you have further questions? Then we are happy to answer them via email at and in person at the event!

List of publications within the nextGEMS project.


Submit your piece of art showing any aspect of working with high-resolution earth system model simulations now!

When starting to work with the nextGEMS simulation output, you will certainly produce new and exiting figures. We would ask you to think about them also in a different way: even if it doesn’t show what you intended, does it look like it could hang in a museum? Like a piece of modern art? Maybe only a couple of tweaks are necessary.

If you would like to contribute to this project, please send an email to Yuting before November 7. Please add a short title and describe in one or two sentences the scientific context of your simulation. The plot shall not show any axes, labels, legends, but give more a focus on the artistic value.


Here you can make settings regarding data protection.