Abstract
The Fifth International Workshop on Ice Nucleation phase 2 (FIN-02): laboratory intercomparison of ice nucleation measurements
Highlights
Ice nucleating particles (INPs) are relatively rare atmospheric particles that play a large role in affecting cold cloud properties and precipitation processes
While we focus in the following discussion on quantifying the decay of total (CPC) particle numbers in order to correct INP number concentration data during the direct sampling periods (“online” used as shorthand in equations) for equivalency with the prior postprocessing collection periods (“offline” used as shorthand in equations), we noted differences ranging from only 10 % to 30 % in fractional loss rates when instead using particle numbers in the larger size range (> 500 nm) to characterize particle number decay over time in the aerosol particle chamber (APC)
Each figure assesses (1) comparisons of direct sampling devices versus collection and post-processing instruments; (2) comparison of different methods for immersion freezing post-processing, whether as droplet arrays on substrates or in aliquot wells (IS, Bielefeld Ice Nucleation ARraY (BINARY), NIPI, KIT-CS, North Carolina State University Cold Stage (NCSU-CS), Carnegie Mellon University Cold Stage (CMU-CS), Vienna Optical Droplet Crystallization Analyzer (VODCA), FRIDGEIMM), in microfluidic devices (WISDOM), or in an acoustic levitator (M-AL); (3) shared versus individual samples (IS and FRIDGE-IMM); and (4) different www.atmos-meas-tech.net/11/6231/2018/
Summary
Ice nucleating particles (INPs) are relatively rare atmospheric particles that play a large role in affecting cold cloud properties and precipitation processes Their presence is needed to initiate ice crystal formation in the absence of conditions that would favor homogeneous freezing nucleation. A variety of devices exist, and the development and use of different instruments continue to expand during a period of great growth in research on mixed phase and ice cloud processes (DeMott et al, 2011) For these reasons, a series of workshops was convened over the course of a year in 2014 to 2015, continuing the historical efforts of the international ice nucleation community to compare and contrast measurements, both to advance understanding within the community and to offer an assessment to the user communities of capabilities and present uncertainties of measurements being published independently
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