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- W4322006769 abstract "Recent experiments and modelling studies suggest that secondary ice production (SIP) may close the gap between observed Arctic ice nucleating particle (INP) concentrations and ice crystal number concentrations (Ni). Here we explore model sensitivities with respect to the complexity of different INP parameterisations in numerical simulations under the premiss that Ni is governed by SIP. Idealised, cloud-resolving simulations are performed for the marine cold air outbreak cloud deck sampled during M-PACE (cloud-top temperature of -17°C) with the ICOsahedral Nonhydrostatic (ICON) model.Droplet shattering (DS) of rain drops according to Phillips et al. (2018), and collisional breakup (CB) (Phillips et al. 2017) were implemented and tested in addition to the existing Hallet-Mossop (HM) rime splintering implemented in ICON’s state-of-the-art two-moment bulk microphysics scheme. Furthermore, a fully prognostic temperature-dependent budget representation of INP (Solomon et al. 2015) was implemented and contrasted to a less sophisticated time-relaxation formulation of atmospheric INP concentrations.Overall, 16 different model experiments (24h runs) were performed and analysed. Despite the considerable amount of uncertainty remaining with regard to ice production mechanisms and their process representation in numerical models we conclude from these experiments that: (i) Ni-enhancement through SIP can close the gap between measured and simulated Ni concentrations during M-PACE in ICON consistent with previous studies (e.g. Sotiropoulou et al. 2020; Zhao et al. 2021), (ii) only simulations where DS dominates the SIP signal (potentially amplified by CB) capture the vertical Ni in-cloud profile correctly, (iii) INP recycling remains necessary for MPC maintenance during M-PACE even if Ni is dominated by SIP, and (iv) experiments using a computationally more efficient relaxation-based prognostic parameterisation of primary nucleation are statistically invariant from simulations considering a prognostic INP budget." @default.
- W4322006769 created "2023-02-26" @default.
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- W4322006769 date "2023-05-15" @default.
- W4322006769 modified "2023-09-29" @default.
- W4322006769 title "Interplay between Primary and Secondary Ice Production (SIP) in Arctic Mixed-Phase Clouds (MPCs) as simulated for the M-PACE campaign in ICON" @default.
- W4322006769 doi "https://doi.org/10.5194/egusphere-egu23-6658" @default.
- W4322006769 hasPublicationYear "2023" @default.
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