Nikolay Koldunov

"Introduction to Physical Oceanography" by R. Stewart is now on GitHub. Free for everyone as it always was. github.com/introocean/i...

My brothers released a new music album. Check it out! Spotify: open.spotify.com/album/3ihT8A... Bandcamp: goinsane.bandcamp.com/album/nonsense YouTube Music: music.youtube.com/playlist?lis...

Can an LLM port a complex Fortran ocean model to C++/Kokkos and make it run on GPUs? Yes. We did it with FESOM2: production runs, ~3–4× speedup vs CPU, same code on LUMI, MareNostrum5 and JUPITER. Fortran as executable specification? Maybe yes :) arxiv.org/abs/2606.11356

🔴 Are you in #Barcelona? Are you interested in #ClimateChange? Then this **EERIE Project public lecture** is for you! ⤵️ 💡 New Views of Climate Change - Insights from Kilometer-Scale Earth System Models 🗓️ Monday, March 9 🕕 6pm CET 🏢 @bsc-cns.bsky.social Register here: events.hifis.net/event/3767/

We posted a preprint on arXiv about PANGAEA-GPT, a multi-agent system for autonomous data discovery and analysis in geoscientific archives. Plots below are generated by the system, and you can read about the steps system made in the paper. 🧪 📄 arxiv.org/abs/2602.21351 💻 github.com/CliDyn/panga...

Built a demo agent for ERA5 on @earthmover.io Arraylake: fast slice access means you can retrieve, iterate & visualize without the coffee breaks. Eurus supports NL→retrieval+analysis, CLI/web/MCP, and a Python REPL (pandas/xarray/cartopy). Video below. Repo+HF: lnkd.in/deQMCNmH lnkd.in/dAbhnKSr

🌍 ClimSight is a system that allows users to get answers to climate-related questions based on very local climate information. Check out the short video to learn the core ideas, and dive into the paper if you’d like to explore the details: 📄 lnkd.in/eReWQ4x6 🧪

How much do LLMs “know” about present-day climate? We asked 17 models for July 1991–2020 temperatures at 15 000+ land points — and many did surprisingly well! Preprint: arxiv.org/abs/2510.08043 🧪 #LLM #Climate

DestinE’s just dropped “From Past to Future” videos: km-scale replays of real floods & hurricanes under past, present & +2 °C climates. See exactly how warming reshapes impacts—turning high-res science into must-see visuals. 🧪 destine.ecmwf.int/news/storyli... www.youtube.com/watch?v=5V62...

New opportunity in our group!

How will interaction with geophysical data evolve in the age of AI? 🤖🌍 In our latest preprint, we explore this question - not just conceptually, but with a hands-on prototype using the PANGAEA archive. Check it out! arxiv.org/abs/2503.05854

🚨 Last chance to submit your application! 🚨 🌊 Scientist in High-Resolution Sea Ice Modeling 🔗 jobs.awi.de/Vacancies/19... 🧠 Scientist in AI-based Emulation for High-Resolution Sea Ice Modeling 🔗 jobs.awi.de/Vacancies/19... Please share! 🧪❄️🌍 #ScienceJobs #SeaIce #AI

We have taken our Artificial Intelligence Forecasting System (AIFS) into operations today to run side by side with our physics-based weather forecasts. The #AIFS outperforms traditional models for many measures, at a fraction of energy use. ➡️ www.ecmwf.int/en/about/med... #AI #MachineLearning

One of the greatest things we do in #DestinE is high-resolution storylines, which show how present-day extreme events might unfold in the future. Check out this ECMWF blog post for details on how it’s done! 🧪

Alfred Wegener institute is finally here @awiexpedition.bsky.social !!!

Preprint summarizing the first results from the nextGEMS project, which prepares several coupled models to run at kilometer scale: egusphere.copernicus.org/preprints/20... 🧪

@carbonbrief.org lists our December paper among the most featured 2024 papers, current score 2,644 - top of the charts for @altmetric.com mentions on @bsky.app 🤯 📈 www.carbonbrief.org/analysis-the... 🔓A free-access reprint link to our paper can be found on Helges website www.awi.de/en/about-us/...

My wife just won the Bremen Women's Chess Championship 2025 and qualified for the German National Championship! Next stop: Munich! So proud of her!

It's always great to visit Helsinki-one of my favorite cities in the world. This time, I caught a glimpse of sea ice, which we’ll be modeling in the @terradt.bsky.social project (by the way, we're hiring!). The project kicked off in Helsinki this week.

🚨 Job Alert! 🚨 Our team is hiring for the @terradt.bsky.social project. 🌊 Scientist in High-Resolution Sea Ice Modeling 🔗 jobs.awi.de/Vacancies/19... 🧠 Scientist in AI-based Emulation for High-Resolution Sea Ice Modeling 🔗 jobs.awi.de/Vacancies/19... Please share! 🧪❄️🌍 #ScienceJobs #SeaIce #AI

This is the description of our km-scale coupled climate model configuration. A lot of details in a thread from @trackow.bsky.social 🧪

New IBCAO (International Bathymetric Chart of the Arctic Ocean) version is out: doi.org/10.1038/s415... Many of us who study the Arctic now need to update our Arctic Bathymetry posters on our walls! :) Figure below shows a comparison of versions 4 and 5. 🧪🌊

Great thread from @jhauck.bsky.social with more details on this study 🧪

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Increased sunlight and more nutrients in the Arctic Ocean won’t boost carbon storage as expected :( 🌊🧪 #FESOM Article in Nature Climate Change: www.nature.com/articles/s41... Press release from AWI: www.awi.de/en/about-us/...

My book is still out there! Please use, adapt, and help maintain if you find it helpful for teaching!

Goodbye Washington, it was fun! #AGU24

Join me and the polar team here in UCL Earth Sciences + Met Office on an exciting CASE studentship looking at Leveraging Machine Learning algorithms for improved Arctic sea-ice prediction using the Met Office suite of models ❄️ + 💻 +🛰️ www.trees-dla.ac.uk/projects/lev...

Exploring the Arctic Ocean? Planning to attend EGU25? Submit an abstract to our session:"Changes in the Arctic Ocean, Sea Ice, and Subarctic Sea Systems: Observations, Models, and Perspectives" (t.ly/BvM9l) Spread the word, and you see in Vienna for exciting talks, posters and discussions!

The Globe in the Smithsonian Museum of Natural History is pretty good, but why the jet colourbar for SST? :)

Our work will also be (remotely) presented at #AGU24 ! agu.confex.com/agu/agu24/me... Dec 11, 01:30pm - 02:30pm (Central Time) Dec 12, 07:30am - 08:30am (Central Time)

🧪 Link to the #agu24 talk today: agu.confex.com/agu/agu24/me...

Heading to #agu24 from Boston.

So exited to be co-hosting this #OpenScience event with @earthmoverhq.bsky.social and @developmentseed.org at #AGU24. Come join us on Tuesday!

Program of presentations at the Google booth during #AGU24

🧪 New paper on why we’ve seen an extra 0.2°C of global warming in recent years.

So true :)

Please, spread the word! 🌊❄️🧪 Exciting opportunities in polar science! Join Lettie Roach’s new group on Southern Ocean & Antarctic Sea Ice Evolution. Multiple positions open: Postdoc, PhDs, and a Scientific Programmer. Deadline: Dec 31, 2024.

Wind over the Atlantic from a 5 km resolution model. Different surface types interact with wind in unique ways, which is why the continents are distinctly visible in the wind field. 🧪 Model: IFS-FESOM | U component of the wind | Project: nextGEMS | Simulations: @trackow.bsky.social #SciArt

Another mind blowing result of AI models in Numerical Weather Prediction. The next step is to train directly on observations.

📣 And the time has come to open the call for abstracts for the Liège Colloquium on Ocean Dynamics for 2025! 🌊 Topic: Marine CDR emerging views and challenges Date: 26-30 May 2025 Abstract deadline: 31 January 2025 More info? www.ocean-colloquium.uliege.be

A great example of ocean eddies and how much faster the atmosphere moves compared to the ocean! 🧪

Earth’s surface painted with 2m temperature. 🧪 Contrasts in temperature between the ocean and land, as well as between different orographic features, allow you to clearly see surface details. Model: IFS-FESOM | Shown: 2m temperature | Project: nextGEMS| Simulations @trackow.bsky.social #SciArt

AI weather forecast models will likely soon become a significant part of regular weather prediction. They already outperform “traditional” models on many skill scores. But how do these models perform in out-of-sample conditions - across past and future climates? 🧪

To celebrate Antarctica Day, here is an image of winds around Antarctica as simulated by a 4 km resolution atmospheric model. 🧪 Model: IFS-FESOM | Shown: U component of wind | Project: nextGEMS #SciArt

GIF seems to be supported now.

🌊That’s a very rare and important paper about finding and fixing a (sea ice related) bug in a climate model. We need more papers like this so the community can learn from mistakes. 🌊🧪