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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
12 Jul 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.
Using depolarization to quantify ice nucleating particle concentrations: a new method
Jake Zenker1, Kristen N. Collier1, Guanglang Xu1, Ping Yang1, Ezra J. T. Levin2, Kaitlyn J. Suski2,a, Paul J. DeMott2, and Sarah D. Brooks1 1Department of Atmospheric Science, Texas A&M University, College Station, TX 77843
2Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80526
aNow at Pacific Northwest National Laboratory, Richland, WA 99352
Abstract. We have developed a new method to determine ice nucleating particle (INP) concentrations observed by a Continuous Flow Diffusion Chamber (CFDC) under a wide range of operating conditions. In this study, we evaluate differences in particle optical properties detected by the Cloud and Aerosol Spectrometer with POLarization (CASPOL) to differentiate between ice crystals, droplets, and aerosols. The depolarization signal from the CASPOL instrument is used to determine the occurrence of water droplet breakthrough (WDBT) conditions in the CFDC, under which traditional determination of ice nucleating particle concentrations by size discrimination fails. To overcome the challenge of WDBT, we design a new analysis method using depolarization ratio that can extend the range of operating conditions of the CFDC. The method agrees reasonably well with the traditional method under non-WDBT conditions with a mean percent error of ±32.1 %. Additionally, a comparison with the Colorado State University (CSU) CFDC shows that the new analysis method can be used reliably during WDBT conditions.

Citation: Zenker, J., Collier, K. N., Xu, G., Yang, P., Levin, E. J. T., Suski, K. J., DeMott, P. J., and Brooks, S. D.: Using depolarization to quantify ice nucleating particle concentrations: a new method, Atmos. Meas. Tech. Discuss.,, in review, 2017.
Jake Zenker et al.
Jake Zenker et al.


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