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Title: Using depolarization to quantify ice nucleating particle concentrations: a new method

Abstract

We have developed a new method to determine ice nucleating particle (INP) concentrations observed by the Texas A&M University 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. The standard procedure for determining INP concentration is to count all particles that have grown beyond a nominal size cutoff as ice crystals. During WDBT this procedure overestimates INP concentration, because large droplets are miscounted as ice crystals. Here we design a new analysis method based on 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 CFDC shows that the new analysis method can be used reliably during WDBT conditions.

Authors:
 [1];  [1];  [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [2];  [1]
  1. Texas A & M Univ., College Station, TX (United States). Dept. of Atmospheric Science
  2. Colorado State Univ., Fort Collins, CO (United States). Dept. of Atmospheric Science
  3. Colorado State Univ., Fort Collins, CO (United States). Dept. of Atmospheric Science; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Texas A & M Univ., College Station, TX (United States); Colorado State Univ., Fort Collins, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Science Foundation (NSF)
OSTI Identifier:
1430720
Grant/Contract Number:  
AC05-76RL01830; SC0014487; ECS-1309854; AGS-1358495; AGS-1339264
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Name: Atmospheric Measurement Techniques (Online); Journal Volume: 10; Journal Issue: 12; Journal ID: ISSN 1867-8548
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Zenker, Jake, Collier, Kristen N., Xu, Guanglang, Yang, Ping, Levin, Ezra J. T., Suski, Kaitlyn J., DeMott, Paul J., and Brooks, Sarah D. Using depolarization to quantify ice nucleating particle concentrations: a new method. United States: N. p., 2017. Web. doi:10.5194/AMT-10-4639-2017.
Zenker, Jake, Collier, Kristen N., Xu, Guanglang, Yang, Ping, Levin, Ezra J. T., Suski, Kaitlyn J., DeMott, Paul J., & Brooks, Sarah D. Using depolarization to quantify ice nucleating particle concentrations: a new method. United States. doi:10.5194/AMT-10-4639-2017.
Zenker, Jake, Collier, Kristen N., Xu, Guanglang, Yang, Ping, Levin, Ezra J. T., Suski, Kaitlyn J., DeMott, Paul J., and Brooks, Sarah D. Fri . "Using depolarization to quantify ice nucleating particle concentrations: a new method". United States. doi:10.5194/AMT-10-4639-2017. https://www.osti.gov/servlets/purl/1430720.
@article{osti_1430720,
title = {Using depolarization to quantify ice nucleating particle concentrations: a new method},
author = {Zenker, Jake and Collier, Kristen N. and Xu, Guanglang and Yang, Ping and Levin, Ezra J. T. and Suski, Kaitlyn J. and DeMott, Paul J. and Brooks, Sarah D.},
abstractNote = {We have developed a new method to determine ice nucleating particle (INP) concentrations observed by the Texas A&M University 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. The standard procedure for determining INP concentration is to count all particles that have grown beyond a nominal size cutoff as ice crystals. During WDBT this procedure overestimates INP concentration, because large droplets are miscounted as ice crystals. Here we design a new analysis method based on 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 CFDC shows that the new analysis method can be used reliably during WDBT conditions.},
doi = {10.5194/AMT-10-4639-2017},
journal = {Atmospheric Measurement Techniques (Online)},
number = 12,
volume = 10,
place = {United States},
year = {2017},
month = {12}
}

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