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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2018-309
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-309
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 Nov 2018

Research article | 14 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Revisiting the differential freezing nucleus spectra derived from drop freezing experiments; methods of calculation, applications and confidence limits

Gabor Vali Gabor Vali
  • Deaprtment of Atmospheric Science, University of Wyoming, Laramie, Wyoming, USA

Abstract. The differential nucleus concentration defined in Vali (1971) is re-examined and methods are given for its calculation. The purpose of this document is to facilitate the use of the differential spectra in describing the results of drop freezing, or similar, experiments and thereby provide additional insights into the measurements. The additive nature of differential concentrations is used to show how the background contribution can be accounted for in the measurements. A method is presented to evaluate the confidence limits of the results at each temperature covered in the measurements.

Gabor Vali
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Gabor Vali
Gabor Vali
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Latest update: 18 Dec 2018
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Short summary
The abundance of freezing nuclei in water samples is routinely determined by experiments involving the cooling of sample drops and observing the temperatures at which the drops freeze. This can be used for characterizing the nucleating abilities of materials in laboratory preparations or to determine the numbers of nucleating particles in rain, snow river water or other natural waters. The evaluation of drop freezing experiments in terms of differential nucleus spectra is advocated in the paper.
The abundance of freezing nuclei in water samples is routinely determined by experiments...
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