Deactivation of ice nuclei due to atmospherically relevant surface coatings
By D. Cziczo, K. Froyd, S. Gallavardin, O. Moehler, S. Benz, Harald Saathoff, Daniel M. Murphy. 2009
174 citations recorded by the source corpus.
The ice nucleation characteristics of Arizona test dust (ATD) and illite clay, surrogates for atmospheric ice nuclei, have been determined at the Aerosol Interactions and Dynamics in the Atmosphere (AIDA) chamber located at the Research Center Karlsruhe in Germany. The objective of this research was to determine the effect of sulfuric acid and ammonium sulfate coatings on the ability of these mineral dust surrogates to nucleate ice in an environment where particles realistically compete for water vapor. Coated ATD particles required higher saturations at all temperatures considered, from −20 to −45 °C, than did identical uncoated particles. Freezing of coated particles often required saturations approaching those for the homogeneous freezing of aqueous solutions of the coating material alone. Less pronounced effects were found for illite, although the presence of a coating consistently increased the saturation or decreased the temperature required for ice formation. Analysis of ice residue at the single particle level suggests that the first coated particles to freeze had thinner or incomplete coatings when compared to particles that froze later in the expansion. This observation highlights a need to verify coating properties since an assumption of homogeneity of a group of coated aerosols may be incorrect. The increase in saturation ratio for freezing suggests that gas-phase uptake of sulfates, a large fraction of which are due to anthropogenic emissions, will reduce the ice and mixed-phase cloud formation potential of atmospheric ice nuclei.
Subfields: Atmospheric Science, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/5e0f46891047c7cf247574d8f78a1bf7428d0467
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Citations in the corpus
- A Classical-Theory-Based Parameterization of Heterogeneous Ice Nucleation by Mineral Dust, Soot, and Biological Particles in a Global Climate Model (2010, background): “We assume here that coated particles are completely deactivated, which is a simplification of recent experimental results (Eastwood et al. 2009; Cziczo et al. 2009a).”
- The deposition ice nucleation and immersion freezing potential of amorphous secondary organic aerosol: Pathways for ice and mixed‐phase cloud formation (2012, background): “…cirrus and mixed-phase cloud studies have shown that ice crystal residues can contain organic materials [Chen et al., 1998; DeMott et al., 2003; Cziczo et al., 2009; Froyd et al., 2009; Prenni et al., 2009a; Froyd et al., 2010], but the exact effects of organics on ice nucleation are not clear.”
- Improvements to an Empirical Parameterization of Heterogeneous Ice Nucleation and Its Comparison with Observations (2013, methodology): “Hallett et al. (1986) observed no ice nucleation by flame soot at temperatures warmer than 2158C.”
- Overview of Ice Nucleating Particles (2017, methodology): “…the effects of INPs on the global scale, GCMs are used in the assessment of the impacts of different INPs such as (NH 4 ) 2 SO 4 (Abbatt et al. 2006), lead-contaminated particles (Cziczo et al. 2009b), feld-spar (Atkinson et al. 2013), and dust INPs (Kuebbeler et al. 2014) on the radiation balance.”
- Aerosol Mixing State: Measurements, Modeling, and Impacts (2019, background): “Some laboratory studies have shown that coatings on INPs can reduce or inhibit the ability to nucleate ice in the deposition mode (i.e., ice nucleates from supersaturated vapor with respect to ice directly on an INP; Cziczo et al., 2009; Hoose & Möhler, 2012; Niedermeier et al., 2011; Sullivan et al”
- Bounding Global Aerosol Radiative Forcing of Climate Change (2020, background): “The internal mixing of dust and soluble aerosol has been1308 shown to suppress the INP activity of dust, such that anthropogenic emissions of liquid1309 aerosol may also impact INP distributions (e.g. Cziczo et al., 2009).”