Using depolarization to quantify ice nucleating particle concentrations [electronic resource] : a new method
- Published:
- Washington, D.C. : United States. Dept. of Energy. Office of Science, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy - Physical Description:
- pages 4,639-4,657 : digital, PDF file
- Additional Creators:
- Pacific Northwest National Laboratory (U.S.), United States. Department of Energy. Office of Science, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- 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.
- Report Numbers:
- E 1.99:1430720
- Subject(s):
- Note:
- Published through SciTech Connect.
12/01/2017.
Atmospheric Measurement Techniques (Online) 10 12 ISSN 1867-8548 AM
Jake Zenker; Kristen N. Collier; Guanglang Xu; Ping Yang; Ezra J. T. Levin; Kaitlyn J. Suski; Paul J. DeMott; Sarah D. Brooks. - Funding Information:
- AC05-76RL01830
SC0014487
ECS-1309854
AGS-1358495
AGS-1339264
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