In situ characterization of mixed phase clouds using the Small Ice Detector and the Particle Phase Discriminator
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Published:2016-01-20
Issue:1
Volume:9
Page:159-177
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Vochezer P., Järvinen E.ORCID, Wagner R.ORCID, Kupiszewski P.ORCID, Leisner T., Schnaiter M.ORCID
Abstract
Abstract. Mixed phase clouds (MPCs) represent a great source of uncertainty for both climate predictions and weather forecasts. In particular, there is still a lack of understanding on how ice forms in these clouds. In this work we present a technique to analyze in situ measurements of MPCs performed with the latest instruments from the Small Ice Detector family. These instruments record high-resolution scattering patterns of individual small cloud particles. For the analysis of the scattering patterns we developed an algorithm that can discriminate the phase of the cloud particles. In the case of a droplet, a Mie solution is fitted to the recorded pattern and the size of the corresponding particle is obtained, which allows for a size calibration of the instrument. In the case of an ice particle, its shape is deduced from the scattering pattern. We apply our data analysis method to measurements from three distinct MPC types. The results from laboratory measurements demonstrate that our technique can discriminate between droplets and ice particles in the same optical size range. This ability was verified by measurements at a mountain top station where we found an alternation of liquid- and ice-dominated cloud regions. The analysis of results from aircraft-based measurements illustrates the ice detection threshold of the technique.
Funder
Deutsche Forschungsgemeinschaft
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference51 articles.
1. Abdelmonem, A., Schnaiter, M., Amsler, P., Hesse, E., Meyer, J., and Leisner,
T.: First correlated measurements of the shape and light scattering
properties of cloud particles using the new Particle Habit Imaging and Polar
Scattering (PHIPS) probe, Atmos. Meas. Tech., 4, 2125–2142,
https://doi.org/10.5194/amt-4-2125-2011, 2011. 2. Baltensperger, U., Schwikowski, M., Jost, D., Nyeki, S., Gäggeler, H., and
Poulida, O.: Scavenging of atmospheric constituents in mixed phase clouds at
the high-alpine site jungfraujoch part I: Basic concept and aerosol
scavenging by clouds, Atmos. Environ., 32, 3975–3983,
https://doi.org/10.1016/S1352-2310(98)00051-X, 1998. 3. Barlow, R.: Statistics: A Guide to the Use of Statistical Methods in the
Physical Sciences, Wiley, 132–133, 1989. 4. Baumgardner, D., Brenguier, J., Bucholtz, A., Coe, H., DeMott, P., Garrett, T.,
Gayet, J., Hermann, M., Heymsfield, A., Korolev, A., Krämer, M., Petzold,
A., Strapp, W., Pilewskie, P., Taylor, J., Twohy, C., Wendisch, M., Bachalo,
W., and Chuang, P.: Airborne instruments to measure atmospheric aerosol
particles, clouds and radiation: A cook's tour of mature and emerging
technology, Atmos. Res., 102, 10–29, https://doi.org/10.1016/j.atmosres.2011.06.021,
2011. 5. Baumgardner, D., Newton, R., Krämer, M., Meyer, J., Beyer, A., Wendisch,
M., and Vochezer, P.: The Cloud Particle Spectrometer with Polarization
Detection (CPSPD): A next generation open-path cloud probe for distinguishing
liquid cloud droplets from ice crystals, Atmos. Research, 142, 2–14,
https://doi.org/10.1016/j.atmosres.2013.12.010, 2014.
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