Variability of ice supersaturated regions at flight altitudes: evaluation of ERA5 reanalysis using IAGOS in situ measurements

Hildebrandt, Katarina Grubbe; Castino, Federica; Meijer, Vincent; Yin, Feijia

doi:10.5194/acp-26-6449-2026

Articles | Volume 26, issue 9

https://doi.org/10.5194/acp-26-6449-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-26-6449-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 9

Research article

|

13 May 2026

Research article |

| 13 May 2026

Variability of ice supersaturated regions at flight altitudes: evaluation of ERA5 reanalysis using IAGOS in situ measurements

Katarina Grubbe Hildebrandt, Federica Castino, Vincent Meijer, and Feijia Yin

Supplement

https://doi.org/10.5194/acp-26-6449-2026-supplement

Data sets

ERA5 monthly averaged data on single levels from 1940 to present H. Hersbach et al. https://doi.org/10.24381/cds.f17050d7

Reanalysis Tropopause Data Repository Lars Hoffmann and Reinhold Spang https://doi.org/10.26165/JUELICH-DATA/UBNGI2

IAGOS final quality con- trolled Observational Data L2 – Time series D. Boulanger et al. https://doi.org/10.25326/06

Model code and software

Code accompanying manuscript "Variability of ice supersaturated regions at flight altitudes: evaluation of ERA5 reanalysis using IAGOS in situ measurements" Katarina Grubbe Hildebrandt https://doi.org/10.4121/915dc859-c397-4294-8e85-83451ebaa881

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Short summary

We evaluate the regional and seasonal variability in the prediction of ice supersaturated region (ISSRS) in the ERA5 reanalysis using in situ measurements. ERA5 shows better ability to predict ISSRs in the extratropics, compared to the tropics, and in colder seasons, such as extratropical winter. While ERA5 generally underestimates the ISSR occurrence, we find an overestimation in tropical regions in seasons associated larger weather variability, such as South Asia in June, July and August.