Preprints
https://doi.org/10.5194/egusphere-2024-151
https://doi.org/10.5194/egusphere-2024-151
25 Jan 2024
 | 25 Jan 2024

Contrail processed aviation soot aerosol are poor ice nucleating particles at cirrus temperatures

Baptiste Testa, Lukas Durdina, Jacinta Edebeli, Curdin Spirig, and Zamin A. Kanji

Abstract. Aviation soot surrogates processed in contrails are believed to become potent ice nuclei at cirrus temperature. This is not verified for real aviation soot, that can have vastly different physico-chemical properties. Here, we sampled soot particles from in-use commercial aircraft engines and quantified the effect of contrail processing on their ice nucleation ability at T < 228 K. We show that aviation soot becomes compacted upon contrail processing but this does not change their ice nucleation ability in contrast to other soot types. The presence of H2SO4 condensed in soot pores, the highly fused nature of the soot primary particles and their arrangement limit the volume of pores generated upon contrail processing, limiting sites for ice nucleation. Furthermore, we hypothesized that contrail processed aviation soot particles emitted from alternative jet fuel would also be poor ice nucleating particles if their emission sizes remain small (< 150 nm).

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Baptiste Testa, Lukas Durdina, Jacinta Edebeli, Curdin Spirig, and Zamin A. Kanji

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-151', Anonymous Referee #1, 07 Mar 2024
  • RC2: 'Comment on egusphere-2024-151', Anonymous Referee #2, 23 Apr 2024
Baptiste Testa, Lukas Durdina, Jacinta Edebeli, Curdin Spirig, and Zamin A. Kanji
Baptiste Testa, Lukas Durdina, Jacinta Edebeli, Curdin Spirig, and Zamin A. Kanji

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Latest update: 12 Jun 2024
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Short summary
Aviation soot residuals released from contrail can become compacted upon sublimation of the ice crystals, generating new voids in the aggregates, where ice nucleation can occur. Here we show that contrail processed soot are highly compact but that they remain unable to form ice at relative humidity different from that required for the formation of background cirrus from the more ubiquitous aqueous solution droplets, suggesting that they will not perturb cirrus cloud formation via ice nucleation.