Preprints
https://doi.org/10.5194/egusphere-2025-819
https://doi.org/10.5194/egusphere-2025-819
17 Mar 2025
 | 17 Mar 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

Abstract. A significant part of precipitation originates from ice crystals while the representation of the cloud mixed phase by atmospheric models remains a challenging task. One of the well-known problem is the discrepancy between the concentration of ice nucleating particles (INPs) and the ice crystal number concentration. This study explores the effect of secondary ice production (SIP) on the properties of the intense precipitation event IOP7a observed during the HYMEX campaign. The effect of SIP on cloud and rain properties is assessed by turning on or off SIP mechanisms in the 3D bin microphysics scheme DESCAM. Our results indicate that including SIP gives better agreement with in situ aircraft observations in terms of ice crystal number concentration and supercooled drop number fraction. During the mature cloud stage, and for temperatures warmer than -30 °C, 59 % of ice crystals are produced by fragmentation due to ice-ice collisions, 38 % by Hallet-Mossop process, 2 % by fragmentation of freezing drops and only 1 % by heterogeneous ice nucleation. Furthermore, ours results shows that the production of small ice crystals by SIP induces a redistribution of the condensed water mass toward particles smaller than 3 mm rather than larger ones. As ice crystals melt, this effect is also visible in the precipitating liquid phase. The shift toward smaller particles results in a reduced precipitation flux of both ice crystals and drops. Consequently, SIP induces a decrease of the accumulated precipitation at the surface by 8 % and reduces heavy rainfall exceeding 40 mm by 20 %.

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Journal article(s) based on this preprint

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
Atmos. Chem. Phys., 25, 10403–10420, https://doi.org/10.5194/acp-25-10403-2025,https://doi.org/10.5194/acp-25-10403-2025, 2025
Short summary
Pierre Grzegorczyk, Wolfram Wobrock, Aymeric Dziduch, and Céline Planche

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-819', Anonymous Referee #1, 19 Apr 2025
  • RC2: 'Comment on egusphere-2025-819', Anonymous Referee #2, 15 May 2025
  • AC1: 'Reply to RC1 and RC2', Pierre Grzegorczyk, 10 Jun 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-819', Anonymous Referee #1, 19 Apr 2025
  • RC2: 'Comment on egusphere-2025-819', Anonymous Referee #2, 15 May 2025
  • AC1: 'Reply to RC1 and RC2', Pierre Grzegorczyk, 10 Jun 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Pierre Grzegorczyk on behalf of the Authors (12 Jun 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (12 Jun 2025) by Greg McFarquhar
RR by Anonymous Referee #1 (20 Jun 2025)
ED: Publish as is (23 Jun 2025) by Greg McFarquhar
AR by Pierre Grzegorczyk on behalf of the Authors (27 Jun 2025)

Journal article(s) based on this preprint

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
Atmos. Chem. Phys., 25, 10403–10420, https://doi.org/10.5194/acp-25-10403-2025,https://doi.org/10.5194/acp-25-10403-2025, 2025
Short summary
Pierre Grzegorczyk, Wolfram Wobrock, Aymeric Dziduch, and Céline Planche
Pierre Grzegorczyk, Wolfram Wobrock, Aymeric Dziduch, and Céline Planche

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Short summary
The impact of secondary ice production (SIP) on a HYMEX 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 %.
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