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

doi:10.5194/acp-2020-339

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-339
	Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals
	Maximilian Weitzel, Subir K. Mitra, Miklós Szakáll, Jacob P. Fugal, and Stephan Borrmann
	2020-05-12
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
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 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 = 15.3Re^1.2, which is in general agreement with literature parameterizations.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/249078
专题	地球科学
推荐引用方式 GB/T 7714	Maximilian Weitzel, Subir K. Mitra, Miklós Szakáll, Jacob P. Fugal, and Stephan Borrmann. Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals[J]. Atmospheric Chemistry and Physics,2020.
APA	Maximilian Weitzel, Subir K. Mitra, Miklós Szakáll, Jacob P. Fugal, and Stephan Borrmann.(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.
MLA	Maximilian Weitzel, Subir K. Mitra, Miklós Szakáll, Jacob P. Fugal, and Stephan Borrmann."Application of holography and automated image processing for laboratory experiments on mass and fall speed of small cloud ice crystals".Atmospheric Chemistry and Physics (2020).