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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-339
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-339
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  12 May 2020

12 May 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals

Maximilian Weitzel1, Subir K. Mitra1, Miklós Szakáll2, Jacob P. Fugal2,a, and Stephan Borrmann1,2 Maximilian Weitzel et al.
  • 1Max Planck Institute for Chemistry, Mainz, Germany
  • 2Institute of Atmospheric Physics, University of Mainz, Mainz, Germany
  • anow at: SeeReal Technologies

Abstract. An ice cloud chamber was developed at the Johannes Gutenberg University of Mainz for generating several thousand data points for mass and sedimentation velocity measurements of ice crystals with sizes less than 150 μm. Ice nucleation was initiated from a cloud of supercooled droplets by local cooling using a liquid nitrogen cold finger. Three-dimensional tracks of ice crystals falling through the slightly supersaturated environment were obtained from the reconstruction of sequential holographic images, automated detection of the crystals in the hologram reconstructions, and particle tracking. Through collection of the crystals and investigation under a microscope before and after melting, crystal mass was determined as a function of size. The experimentally obtained mass versus diameter (m(D)) power law relationship resulted in lower masses for small ice crystals than from commonly adopted parameterizations. Thus, they did not support the currently accepted extrapolation of relationships measured for larger crystal sizes. The relationship between Best (X) and Reynolds (Re) numbers for columnar crystals was found to be X = 15.3Re1.2, which is in general agreement with literature parameterizations.

Maximilian Weitzel et al.

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Status: closed
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Maximilian Weitzel et al.

Maximilian Weitzel et al.

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Latest update: 24 Sep 2020
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Short summary
The properties of ice crystals smaller than 150 micrometers in diameter were investigated in a cold room laboratory using digital holography and microscopy. Automated image processing has been used to determine the track of falling ice crystals, and collected crystals were melted and scanned under a microscope to infer particle mass. A parameterization relating particle size and mass was determined which describes ice crystals in this size range more accurately than existing relationships.
The properties of ice crystals smaller than 150 micrometers in diameter were investigated in a...
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