On the Weather Impact of Contrails:  New Insights from Coupled ICON–CoCiP Simulations

Schumann, Ulrich; Seifert, Axel

doi:10.5194/acp-25-18571-2025

Articles | Volume 25, issue 24

https://doi.org/10.5194/acp-25-18571-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-18571-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 24

Research article

|

19 Dec 2025

Research article |

| 19 Dec 2025

On the Weather Impact of Contrails: New Insights from Coupled ICON–CoCiP Simulations

Ulrich Schumann and Axel Seifert

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Dec 2025	502	214	36	752
Jan 2026	384	155	7	546
Feb 2026	233	188	30	451
Mar 2026	260	268	16	544
Apr 2026	178	130	11	319
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Cumulative views and downloads (calculated since 25 Sep 2025)

Month	HTML	PDF	XML	Total
Sep 2025	1,436	14	8	1,458
Oct 2025	472	56	16	544
Nov 2025	198	126	26	350
Dec 2025	502	214	36	752
Jan 2026	384	155	7	546
Feb 2026	233	188	30	451
Mar 2026	260	268	16	544
Apr 2026	178	130	11	319
May 2026	137	53	4	194
Jun 2026	36	14	4	54
Jul 2026	73	39	14	126
Aug 2026	80	47	16	143
Sep 2026	245	154	105	504
Oct 2026	195	118	83	396
Nov 2026	48	23	13	84

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Short summary

Contrails caused by aircraft flying in cold and humid air masses, impact weather and climate. For reduction of the climate impact, one should avoid flights forming warming contrails. This requires good weather forecast of contrail formation conditions and contrail effects. We present a two-way coupling of the Contrail Cirrus Prediction model (CoCiP) with the global Icosahedral Non-hydrostatic numerical weather model (ICON). We find that contrails are predictable – but only for a finite period.