Please use this identifier to cite or link to this item:
http://doi.org/10.25358/openscience-5608
Authors: | Weitzel, Maximilian Mitra, Subir K. Szakáll, Miklós Fugal, Jacob P. Borrmann, Stephan |
Title: | Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals |
Online publication date: | 28-Jan-2021 |
Year of first publication: | 2020 |
Language: | english |
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=15.3 Re1.2, which is in general agreement with literature parameterizations. |
DDC: | 530 Physik 530 Physics 540 Chemie 540 Chemistry and allied sciences |
Institution: | Johannes Gutenberg-Universität Mainz |
Department: | FB 09 Chemie, Pharmazie u. Geowissensch. |
Place: | Mainz |
ROR: | https://ror.org/023b0x485 |
DOI: | http://doi.org/10.25358/openscience-5608 |
Version: | Published version |
Publication type: | Zeitschriftenaufsatz |
License: | CC BY |
Information on rights of use: | https://creativecommons.org/licenses/by/4.0/deed.en |
Journal: | Atmospheric chemistry and physics 20 23 |
Pages or article number: | 14889 14901 |
Publisher: | EGU |
Publisher place: | Katlenburg-Lindau |
Issue date: | 2020 |
ISSN: | 1680-7324 |
Publisher URL: | https://doi.org/10.5194/acp-20-14889-2020 |
Publisher DOI: | 10.5194/acp-20-14889-2020 |
Appears in collections: | JGU-Publikationen |
Files in This Item:
File | Description | Size | Format | ||
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![]() | weitzel_maximilian-application_of-20210128130038627.pdf | 3.65 MB | Adobe PDF | View/Open |