Overview of ambient ice nucleation measurements from 1949 – 2000

<p>We report on the addition of 50 years of literature data to the Ice Nucleation DataBase (INDB) created for the EU FP7 BACCHUS project (https://www.bacchus-env.eu/in/). The database is intended to become a tool for the Ice Nucleation community to facilitate finding ice nucleating particle (INP) concentration data collected at specific locations and times. The INDB can be used for comparison reviews, to investigate temporal changes in INP concentrations, identify regions of interest, to inform the planning of future observations, and to facilitate data provision for modelling studies. Worldwide data from more than 170 publications between 1949 to 2000 were digitised and added to the INDB, and more than 130 additional publications have been identified and will be utilized to extend the compilation into 2020. Here we provide an overview of the digitised historical datasets, the times, locations, and experimental conditions under which INP were measured. Exemplary insights from the INDB are discussed by comparing ambient temperature spectra pre and post 1970 in different geographic regions.</p>