Ozone Imager V2 ((free)) Instant

Correspondence: a.chen@atmos.ethz.ch Level 2 TCO granules at 10-min latency via CODECS cloud archive.

| Metric | OIv2 | OMI (Aura) | |--------|------|-------------| | Nadir resolution | 1.5 km | 13×24 km | | Swath width | 1200 km | 2600 km | | TCO RMSE vs. Dobson | 2.8% | 3.5% | | Signal-to-noise ratio (312 nm) | 450 | 180 |

Ozone Imager v2 introduces several key upgrades over its predecessor, focusing on better visual feedback and more transparent processing.

OIv2 demonstrates that fine-scale ozone variability is ubiquitous, particularly near urban centers, biomass burning, and mountain waves. The ability to resolve <5 km features challenges the assumption of spatial homogeneity in satellite ozone validation. Future work includes assimilation into GEOS-Chem and operational UV index forecasting.

The fixed filter set cannot retrieve ozone profiles (only total column). Stray light at low solar angles remains a minor issue (<1% error).