EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development of drop freezing ice nucleation chamber (FINC), validation using lignin, and application to organic matter samples

Anna Miller1, Killian Brennan2, Jörg Wieder2, Claudia Mignani3, Assaf Zipori4, and Nadine Borduas-Dedekind1,2
Anna Miller et al.
  • 1Institute of Biogeochemistry and Pollutant Dynamics, ETH-Zurich, Zurich, Switzerland (
  • 2Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
  • 3Institute of Environmental Geosciences, University of Basel, Basel, Switzerland
  • 4Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel

Aerosol-cloud interactions are a source of high uncertainties in predicting future climate. One important aerosol-cloud interaction is ice nucleation of supercooled liquid water droplets caused by ice nucleating particles (INPs). Predicting the distribution and concentration of INPs is a challenge because of their spatial and temporal heterogeneity in source, number, and composition. Organic aerosols are particularly diverse and complex in chemical and physical composition and can be highly ice active to varying degrees. Here we present the development of our drop Freezing Ice Nucleation Chamber (FINC) for the quantification of INP concentration of aerosol in the immersion freezing mode. As part of the development and validation of FINC, we show results from an intercomparison using lignin as a comparison standard with three other drop-freezing instruments (ETH’s Drop Freezing Ice Nucleation counter Zurich (DRINCZ), University of Basel’s LED-based Ice Nucleation Detection Apparatus (LINDA), and Weizmann Institute’s Supercooled Droplet Observation of Microarray (WISDOM)). In addition, we present here preliminary findings of FINC’s application for determining predictors of the ice nucleating ability of organic matter, using several standards and field-collected samples of dissolved organic matter as a proxy for organic aerosol emitted from natural waters. These methods and results can aid in the community’s search for predictors and parameterizations of organic aerosol induced ice nucleation.

How to cite: Miller, A., Brennan, K., Wieder, J., Mignani, C., Zipori, A., and Borduas-Dedekind, N.: Development of drop freezing ice nucleation chamber (FINC), validation using lignin, and application to organic matter samples, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-630,, 2019


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