Ai2 updates HiRO-ACE for three-kilometre climate simulations
The research team reports lower simulation costs while describing limits to the model’s scope.
Event / data period: 2026-10-14
Published: · Updated:
Ai2 announced HiRO-ACEv2 on October 14, an update to its system for producing global climate simulations at three-kilometre resolution. The system combines ACE, which models conditions at 100 kilometres, with HiROv2, which downscales those outputs. Ai2 says the updated component handles high-resolution rain, wind and pressure fields and better reproduces extreme events.
In Ai2’s tests against the X-SHiELD simulation used for training, high-resolution statistics were within 3% even for events appearing once per million data points. This result applies to the test in which HiRO received coarsened X-SHiELD data. The institute estimates global runs cost about 1/300 as much as X-SHiELD. Ai2 says this is climate simulation, not operational weather forecasting: the model is tuned to X-SHiELD and cannot yet represent other climates or ERA5 historical data.
Data
Announcement summary
The research team reports lower simulation costs while describing limits to the model’s scope.
- · Occurred
Ai2 updates HiRO-ACE for three-kilometre climate simulations
The research team reports lower simulation costs while describing limits to the model’s scope.
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This event record summarizes the source announcement and adds no independent verification or generalization beyond it.
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