Articles | Volume 26, issue 9
https://doi.org/10.5194/acp-26-6449-2026
https://doi.org/10.5194/acp-26-6449-2026
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

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Revised manuscript not accepted
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Cited articles

Agarwal, A., Meijer, V., Eastham, S. D., Speth, R. L., and Barret, S. R. H.: Reanalysis-driven simulations may overestimate persistent contrail formation by 100%–250%, Environ. Res. Lett., 17, https://doi.org/10.1088/1748-9326/ac38d9, 2022. a, b
Alduchov, O. A. and Eskridge, R. E.: Improved Magnus Form Approximation of Saturation Vapor Pressure, J. Appl. Meteorol. Clim., 35, 601–609, https://doi.org/10.1175/1520-0450(1996)035<0601:IMFAOS>2.0.CO;2, 1996. a
Arriolabengoa, S., Crispel, P., Jaron, O., Bouteloup, Y., Vié, B., Li, Y., Petzold, A., and Plu, M.: Modeling and verifying ice supersaturated regions in the ARPEGE model for persistent contrail forecast, Atmos. Chem. Phys., 25, 18051–18076, https://doi.org/10.5194/acp-25-18051-2025, 2025. a
Avila, D., Sherry, L., and Thompson, T.: Reducing global warming by airline contrail avoidance: A case study of annual benefits for the contiguous United States, Transportation Research Interdisciplinary Perspectives, 2, 100033, https://doi.org/10.1016/j.trip.2019.100033, 2019. a
Beswick, K., Baumgardner, D., Gallagher, M., Volz-Thomas, A., Nedelec, P., Wang, K.-Y., and Lance, S.: The backscatter cloud probe – a compact low-profile autonomous optical spectrometer, Atmos. Meas. Tech., 7, 1443–1457, https://doi.org/10.5194/amt-7-1443-2014, 2014. a
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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.
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