SIGNATURE WORK
CONFERENCE & EXHIBITION 2022

The immersion freezing activity of aerosol particles in the Arctic (79°N, 12°E) has been parameterized using data from atmospheric measurements. Descriptive statistics are used to summarize how the concentration of ice nucleating particles varies with different particle size aerosol concentrations at different temperatures. Existing parameterization methods are quantifying ice nucleating particle concentrations as functions of temperature and the total number concentration of aerosol particles larger than specific diameter thresholds or in specific diameter ranges. The effectiveness of different diameters in the parameterization is compared from two aspects, the Spearman correlation coefficient and the fitted root mean square error. The proposed parametric approach introduces a physical model that makes the prediction more meaningful by calculating the parallel activation probability of potential nucleation sites on the surface of aerosol particles. The prediction results of the proposed parameterization method are slightly better than the existing empirical parameterization and have the advantage that the accuracy improves with expanding the diameter range, i.e., in practical applications, there is no need to change parameters or introduce correction factors for different prediction accuracy requirements.