The importance of crystalline phases in ice nucleation by volcanic ash
https://www.atmos-chem-phys-discuss.net/acp-2018-1326/
https://doi.org/10.5194/acp-2018-1326

This is the dataset for “The importance of crystalline phases in ice nucleation by volcanic ash” in Atmospheric Chemistry and Physics. The data files include the following:

water_background_replicates.xlsx

This is replicate ice nucleation data for the water background experiments accompanying the tephra and glass experiments. The columns list temperatures (T) and corresponding droplet frozen fractions (fice) for the array of droplets in each experiment. Mean values and standard deviations for these data were used in Figure 2 in the paper.

tephra_and_glass_replicates.xlsx

This is replicate ice nucleation data for the tephra and glass experiments for all eighteen samples. The columns list temperatures (T) and corresponding droplet frozen fractions (fice) and ice nucleation active site densities (ns) for the array of droplets in each experiment. These data were used in Figure 3 in the paper.

tephra_and_glass_pooled.xlsx

This is pooled ice nucleation data for the water background experiments and the tephra and glass experiments for all eighteen samples. The columns list temperatures (T) and corresponding droplet frozen fractions (fice) and ice nucleation active site densities (ns) for the total array of droplets compiling replicate experiments. For the water background, theoretical upper limit ice nucleation active site densities were calculated from upper limit (mean plus standard deviation) droplet freezing temperatures as described in the paper. For the tephra and glass, errors were determined from upper and lower limit ice nucleation active site densities calculated by Poisson Monte Carlo simulations. These data were used in Figures 2 and 5 in the paper.

tephra_and_glass_INA_and_properties.xlsx

This provides the ice-nucleating activities (INA) of the tephra and glass samples in terms of the temperature at which the ice nucleation active site density is approximately equal to one (Tns ≈ 1 cm-2). It also gives the chemical compositions, crystallinities, and mineralogies of the samples. These data were used in Figures 1, 4, 6, S1 and S2 in the paper and supplement.