气候变化领域集成服务门户(CCPortal): Sedimentation of Snow Particles in Still Air in Stokes Regime

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DOI	10.1029/2020GL087832
	Sedimentation of Snow Particles in Still Air in Stokes Regime
	Zeugin T.; Krol Q.; Fouxon I.; Holzner M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	We compute the resistance matrices of realistic 3-D snow particle shapes obtained from microcomputed tomography data of snowpack samples and a phase field model. Using these resistance matrices, we calculate the sedimentation of the particles in still air in Stokes regime. We find that particles attain preferred orientations and the mode of motion is either drifting or spiraling. Simple laws, relating average drag and rotation torque coefficients to the particles' sphericity, are established which lead to a new formulation of a snow particle's average terminal velocity. The presented models are valid in Stokes regime in still air, corresponding to particle sizes up to ∼100 μm but can reasonably be extended to moderately higher Reynolds numbers (∼1 mm) and used for estimating mean settling velocity in turbulent conditions. Though not all relevant atmospheric conditions are covered, our study provides the basis for addressing more complex conditions in the future. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Computerized tomography; Drag; Matrix algebra; Reynolds number; Snow; Atmospheric conditions; Complex condition; Microcomputed tomography; Phase field models; Preferred orientations; Rotation torques; Settling velocity; Terminal velocity; Air; numerical model; particle size; Reynolds number; sedimentation; settling velocity; snow; torque
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170035
作者单位	Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland; Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland; Swiss Federal Institute for Water Science and Technology EAWAG, Dübendorf, Switzerland
推荐引用方式 GB/T 7714	Zeugin T.,Krol Q.,Fouxon I.,et al. Sedimentation of Snow Particles in Still Air in Stokes Regime[J],2020,47(15).
APA	Zeugin T.,Krol Q.,Fouxon I.,&Holzner M..(2020).Sedimentation of Snow Particles in Still Air in Stokes Regime.Geophysical Research Letters,47(15).
MLA	Zeugin T.,et al."Sedimentation of Snow Particles in Still Air in Stokes Regime".Geophysical Research Letters 47.15(2020).