Influence of secondary ice production on cloud and rain properties: analysis of the HYMEX IOP7a heavy-precipitation event

Grzegorczyk, Pierre; Wobrock, Wolfram; Dziduch, Aymeric; Planche, Céline

doi:https://doi.org/10.5194/acp-25-10403-2025

Articles | Volume 25, issue 17

https://doi.org/10.5194/acp-25-10403-2025

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

https://doi.org/10.5194/acp-25-10403-2025

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

Articles | Volume 25, issue 17

Research article

|

12 Sep 2025

Research article |

| 12 Sep 2025

Influence of secondary ice production on cloud and rain properties: analysis of the HYMEX IOP7a heavy-precipitation event

Pierre Grzegorczyk, Wolfram Wobrock, Aymeric Dziduch, and Céline Planche

Data sets

DSD network, La Souche OHMCV https://doi.org/10.17178/OHMCV.DSD.SOU.12-16.1

DSD network, Saint-Etienne-de-Fontbellon OHMCV https://doi.org/10.17178/OHMCV.DSD.SEF.12-16.1

CLOUD DROPLET PROBE data from SAFIRE/F20 aircraft during HYMEX SOP1 A. Schwarzenboeck https://doi.org/10.6096/MISTRALS-HyMeX.1228

Particle size distribution from imagers onboard SAFIRE/F20 aircraft during HYMEX SOP1 A. Schwarzenboeck https://doi.org/10.6096/MISTRALS-HyMeX.1225

Short summary

The impact of secondary ice production (SIP) on an intense-precipitation event is investigated using 3D bin microphysics. Including SIP improves agreement with in situ aircraft observations (ice crystal number concentration and supercooled drop number fraction), generates small ice crystals, and redistributes condensed water mass toward smaller particle sizes. As these crystals melt, the liquid precipitation flux decreases, reducing total precipitation by 8 % and heavy rainfall by 20 %.