气候变化领域集成服务门户(CCPortal): Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals

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DOI	10.5194/acp-20-14889-2020
	Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals
	Weitzel M.; Mitra S.K.; Szakall M.; Fugal J.P.; Borrmann S.
发表日期	2020
ISSN	1680-7316
起始页码	14889
结束页码	14901
卷号	20 期号:23
英文摘要	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 um. Ice nucleation was initiated from a cloud of supercooled droplets by local cooling using a liquid nitrogen cold finger. Threedimensional 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 D 15:3 Re1:2, which is in general agreement with literature parameterizations. © 2020 BMJ Publishing Group. All rights reserved.
英文关键词	automation; cloud microphysics; holography; ice crystal; image processing; laboratory method
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168918
作者单位	Particle Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany; Institute of Atmospheric Physics, University of Mainz, Mainz, Germany; SeeReal Technologies, Dresden, Germany
推荐引用方式 GB/T 7714	Weitzel M.,Mitra S.K.,Szakall M.,et al. Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals[J],2020,20(23).
APA	Weitzel M.,Mitra S.K.,Szakall M.,Fugal J.P.,&Borrmann S..(2020).Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals.Atmospheric Chemistry and Physics,20(23).
MLA	Weitzel M.,et al."Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals".Atmospheric Chemistry and Physics 20.23(2020).