https://vlap.github.io/tags/atmospheric-modeling/Recent content in Atmospheric Modeling on Vladimir Lapinhttps://vlap.github.io/images/decor/vladimir_lapin.jpghttps://vlap.github.io/images/decor/vladimir_lapin.jpgHugoen-usThu, 24 Sep 2026 18:00:00 +0200https://vlap.github.io/posts/2026-09-24-openifs-mass-conservation-stochastic-rounding/Thu, 24 Sep 2026 18:00:00 +0200https://vlap.github.io/posts/2026-09-24-openifs-mass-conservation-stochastic-rounding/The first time you run OpenIFS in single precision, the global CO₂ mass budget will look like it has a severe leak. Here is what we found after tracking the diagnostics term-by-term, why >99.5% of the drift is chaotic weather, and how stochastic rounding fixed the real numerical error.