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001049770 1001_ $$00000-0001-7405-013X$$aKlocke, Daniel$$b0$$eCorresponding author
001049770 1112_ $$aSC '25: The International Conference for High Performance Computing, Networking, Storage and Analysis$$cSt. Louis, MO, USA$$d2025-11-17 - 2025-11-21$$gSC25$$wUSA
001049770 245__ $$aComputing the Full Earth System at 1km Resolution
001049770 260__ $$aNew York, NY, USA$$bACM New York, NY, USA$$c2025
001049770 29510 $$aProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis
001049770 300__ $$a125-136
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001049770 500__ $$aarXiv version: https://arxiv.org/abs/2511.02021
001049770 520__ $$aWe present the first-ever global simulation of the full Earth system at 1.25 km grid spacing, achieving highest time compression with an unseen number of degrees of freedom. Our model captures the flow of energy, water, and carbon through key components of the Earth system: atmosphere, ocean, and land. To achieve this landmark simulation, we harness the power of 8192 GPUs on Alps and 20480 GPUs on JUPITER, two of the world’s largest GH200 superchip installations. We use both the Grace CPUs and Hopper GPUs by carefully balancing Earth’s components in a heterogeneous setup and optimizing acceleration techniques available in ICON’s codebase. We show how separation of concerns can reduce the code complexity by half while increasing performance and portability. Our achieved time compression of 145.7 simulated days per day enables long studies including full interactions in the Earth system and even outperforms earlier atmosphere-only simulations at a similar resolution.
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001049770 7001_ $$00000-0002-8615-5702$$aFrauen, Claudia$$b1
001049770 7001_ $$0P:(DE-HGF)0$$aEngels, Jan Frederik$$b2
001049770 7001_ $$00000-0002-6425-2181$$aAlexeev, Dmitry$$b3
001049770 7001_ $$00000-0003-3117-3724$$aRedler, René$$b4
001049770 7001_ $$00000-0002-7380-8313$$aSchnur, Reiner$$b5
001049770 7001_ $$00000-0002-9883-5086$$aHaak, Helmuth$$b6
001049770 7001_ $$00000-0002-0765-2808$$aKornblueh, Luis$$b7
001049770 7001_ $$00000-0002-9052-6828$$aBrüggemann, Nils$$b8
001049770 7001_ $$00000-0003-4201-0373$$aChegini, Fatemeh$$b9
001049770 7001_ $$0P:(DE-Juel1)196846$$aRömmer, Manoel$$b10
001049770 7001_ $$0P:(DE-Juel1)129125$$aHoffmann, Lars$$b11
001049770 7001_ $$0P:(DE-Juel1)129121$$aGriessbach, Sabine$$b12
001049770 7001_ $$0P:(DE-Juel1)192255$$aBode, Mathis$$b13
001049770 7001_ $$00000-0003-4526-5021$$aColes, Jonathan$$b14
001049770 7001_ $$00009-0006-9363-7060$$aGila, Miguel$$b15
001049770 7001_ $$00000-0001-5894-0765$$aSawyer, William$$b16
001049770 7001_ $$00000-0001-9095-9108$$aCalotoiu, Alexandru$$b17
001049770 7001_ $$00009-0008-7855-2290$$aBudanaz, Yakup$$b18
001049770 7001_ $$00009-0001-0896-3026$$aMazumder, Pratyai$$b19
001049770 7001_ $$00000-0002-7606-5519$$aCopik, Marcin$$b20
001049770 7001_ $$00009-0006-8170-8888$$aWeber, Benjamin$$b21
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001049770 7001_ $$00009-0008-2753-261X$$aBockelmann, Hendryk$$b23
001049770 7001_ $$00000-0002-1333-9797$$aHoefler, Torsten$$b24
001049770 7001_ $$00000-0002-7478-6275$$aHohenegger, Cathy$$b25
001049770 7001_ $$00000-0003-3795-0475$$aStevens, Bjorn$$b26
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