PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function
<p>A major challenge for in situ observations in mixed-phase clouds remains the phase discrimination and sizing of cloud hydrometeors. In this work, we present a new method for determining the phase of individual cloud hydrometeors based on their angular-light-scattering behavior employed by t...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-04-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/14/3049/2021/amt-14-3049-2021.pdf |
| _version_ | 1818386700344229888 |
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| author | F. Waitz M. Schnaiter M. Schnaiter T. Leisner E. Järvinen E. Järvinen |
| author_facet | F. Waitz M. Schnaiter M. Schnaiter T. Leisner E. Järvinen E. Järvinen |
| author_sort | F. Waitz |
| collection | DOAJ |
| description | <p>A major challenge for in situ observations in mixed-phase clouds remains the phase discrimination and sizing of cloud hydrometeors.
In this work, we present a new method for determining the phase of individual cloud hydrometeors based on their angular-light-scattering behavior employed by the PHIPS (Particle Habit Imaging and Polar Scattering) airborne cloud probe. The phase discrimination algorithm is based on the difference of distinct features in the angular-scattering function of spherical and aspherical particles. The algorithm is calibrated and evaluated using a large data set gathered during two in situ aircraft campaigns in the Arctic and Southern Ocean.
Comparison of the algorithm with manually classified particles showed that we can confidently discriminate between spherical and aspherical particles with a 98 % accuracy. Furthermore, we present a method for deriving particle size distributions based on single-particle angular-scattering data for particles in a size range from 100 <span class="inline-formula">µ</span>m <span class="inline-formula">≤</span> <span class="inline-formula"><i>D</i></span> <span class="inline-formula">≤</span> 700 <span class="inline-formula">µ</span>m and 20 <span class="inline-formula">µ</span>m <span class="inline-formula">≤</span> <span class="inline-formula"><i>D</i></span> <span class="inline-formula">≤</span> 700 <span class="inline-formula">µ</span>m for droplets and ice particles, respectively. The functionality of these methods is demonstrated in three representative case studies.</p> |
| first_indexed | 2024-12-14T03:58:13Z |
| format | Article |
| id | doaj.art-b597bc805b164f9cbdd7ee6cf9751c21 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-14T03:58:13Z |
| publishDate | 2021-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-b597bc805b164f9cbdd7ee6cf9751c212022-12-21T23:18:02ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482021-04-01143049307010.5194/amt-14-3049-2021PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering functionF. Waitz0M. Schnaiter1M. Schnaiter2T. Leisner3E. Järvinen4E. Järvinen5Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, GermanyInstitute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, GermanyschnaiTEC GmbH, Karlsruhe, GermanyInstitute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, GermanyInstitute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, GermanyEOL (Earth Observing Laboratory), National Center for Atmospheric Research (NCAR), Boulder, CO, USA<p>A major challenge for in situ observations in mixed-phase clouds remains the phase discrimination and sizing of cloud hydrometeors. In this work, we present a new method for determining the phase of individual cloud hydrometeors based on their angular-light-scattering behavior employed by the PHIPS (Particle Habit Imaging and Polar Scattering) airborne cloud probe. The phase discrimination algorithm is based on the difference of distinct features in the angular-scattering function of spherical and aspherical particles. The algorithm is calibrated and evaluated using a large data set gathered during two in situ aircraft campaigns in the Arctic and Southern Ocean. Comparison of the algorithm with manually classified particles showed that we can confidently discriminate between spherical and aspherical particles with a 98 % accuracy. Furthermore, we present a method for deriving particle size distributions based on single-particle angular-scattering data for particles in a size range from 100 <span class="inline-formula">µ</span>m <span class="inline-formula">≤</span> <span class="inline-formula"><i>D</i></span> <span class="inline-formula">≤</span> 700 <span class="inline-formula">µ</span>m and 20 <span class="inline-formula">µ</span>m <span class="inline-formula">≤</span> <span class="inline-formula"><i>D</i></span> <span class="inline-formula">≤</span> 700 <span class="inline-formula">µ</span>m for droplets and ice particles, respectively. The functionality of these methods is demonstrated in three representative case studies.</p>https://amt.copernicus.org/articles/14/3049/2021/amt-14-3049-2021.pdf |
| spellingShingle | F. Waitz M. Schnaiter M. Schnaiter T. Leisner E. Järvinen E. Järvinen PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function Atmospheric Measurement Techniques |
| title | PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function |
| title_full | PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function |
| title_fullStr | PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function |
| title_full_unstemmed | PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function |
| title_short | PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function |
| title_sort | phips halo the airborne particle habit imaging and polar scattering probe part 3 single particle phase discrimination and particle size distribution based on the angular scattering function |
| url | https://amt.copernicus.org/articles/14/3049/2021/amt-14-3049-2021.pdf |
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