TY  - CONF
AU  - Klocke, Daniel
AU  - Frauen, Claudia
AU  - Engels, Jan Frederik
AU  - Alexeev, Dmitry
AU  - Redler, René
AU  - Schnur, Reiner
AU  - Haak, Helmuth
AU  - Kornblueh, Luis
AU  - Brüggemann, Nils
AU  - Chegini, Fatemeh
AU  - Römmer, Manoel
AU  - Hoffmann, Lars
AU  - Griessbach, Sabine
AU  - Bode, Mathis
AU  - Coles, Jonathan
AU  - Gila, Miguel
AU  - Sawyer, William
AU  - Calotoiu, Alexandru
AU  - Budanaz, Yakup
AU  - Mazumder, Pratyai
AU  - Copik, Marcin
AU  - Weber, Benjamin
AU  - Herten, Andreas
AU  - Bockelmann, Hendryk
AU  - Hoefler, Torsten
AU  - Hohenegger, Cathy
AU  - Stevens, Bjorn
TI  - Computing the Full Earth System at 1km Resolution
CY  - New York, NY, USA
PB  - ACM New York, NY, USA
M1  - FZJ-2025-05554
SP  - 125-136
PY  - 2025
N1  - arXiv version: https://arxiv.org/abs/2511.02021
AB  - We present the first-ever global simulation of the full Earth system at 1.25 km grid spacing, achieving highest time compression with an unseen number of degrees of freedom. Our model captures the flow of energy, water, and carbon through key components of the Earth system: atmosphere, ocean, and land. To achieve this landmark simulation, we harness the power of 8192 GPUs on Alps and 20480 GPUs on JUPITER, two of the world’s largest GH200 superchip installations. We use both the Grace CPUs and Hopper GPUs by carefully balancing Earth’s components in a heterogeneous setup and optimizing acceleration techniques available in ICON’s codebase. We show how separation of concerns can reduce the code complexity by half while increasing performance and portability. Our achieved time compression of 145.7 simulated days per day enables long studies including full interactions in the Earth system and even outperforms earlier atmosphere-only simulations at a similar resolution.
T2  - SC '25: The International Conference for High Performance Computing, Networking, Storage and Analysis
CY  - 17 Nov 2025 - 21 Nov 2025, St. Louis, MO, USA (USA)
Y2  - 17 Nov 2025 - 21 Nov 2025
M2  - St. Louis, MO, USA, USA
LB  - PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
DO  - DOI:10.1145/3712285.3771789
UR  - https://juser.fz-juelich.de/record/1049770
ER  -