气候变化领域集成服务门户(CCPortal): The Geometry of Rimed Aggregate Snowflakes: A Modeling Study

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DOI	10.1029/2018MS001519
	The Geometry of Rimed Aggregate Snowflakes: A Modeling Study
	Seifert A.; Leinonen J.; Siewert C.; Kneifel S.
发表日期	2019
ISSN	19422466
起始页码	712
结束页码	731
卷号	11 期号:3
英文摘要	Computer simulations of the aggregation and riming of ice crystals are performed to investigate the geometry of rimed aggregate snowflakes. Due to the universality of the geometry of aggregates, the conversion to a graupel-like particle is self-similar and independent from specific properties of the aggregate, when formulated in properly normalized variables. Hence, the particle habit of the primary crystals, the size of the aggregate or the density of the rime mass, does not lead to a structural change in the transition to graupel. Therefore, this transition can be parameterized by a similarity approach using simulations of many individual rimed aggregates. These parameterizations can replace the classic fill-in model used in many cloud models. The parameterizations are applied and tested in a one-dimensional Lagrangian superparticle model to simulate the growth of aggregates in a liquid layer. We find that the similarity model for the geometry of rimed snowflakes leads to a more rapid growth by riming and, hence, an increased precipitation rate compared to the fill-in model. The main reason for this is that the increase of the maximum dimension during the early stages of riming is properly taken into account by the similarity model, whereas it is neglected by the fill-in model. ©2019. The Authors.
英文关键词	aggregation; Monte Carlo simulation; riming; snowflakes
语种	英语
scopus关键词	Aggregates; Geometry; Intelligent systems; Monte Carlo methods; One dimensional; Parameterization; Snow; Ice crystals; Parameterized; Precipitation rates; Primary crystal; riming; Similarity models; snowflakes; Specific properties; Agglomeration; aggregate; crystal structure; density; geometry; liquid; Monte Carlo analysis; nucleation; numerical model; rime; snow
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156943
作者单位	Deutscher Wetterdienst, Offenbach, Germany; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany
推荐引用方式 GB/T 7714	Seifert A.,Leinonen J.,Siewert C.,et al. The Geometry of Rimed Aggregate Snowflakes: A Modeling Study[J],2019,11(3).
APA	Seifert A.,Leinonen J.,Siewert C.,&Kneifel S..(2019).The Geometry of Rimed Aggregate Snowflakes: A Modeling Study.Journal of Advances in Modeling Earth Systems,11(3).
MLA	Seifert A.,et al."The Geometry of Rimed Aggregate Snowflakes: A Modeling Study".Journal of Advances in Modeling Earth Systems 11.3(2019).