气候变化领域集成服务门户(CCPortal): Ice Particle Properties Inferred From Aggregation Modelling

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DOI	10.1029/2020MS002066
	Ice Particle Properties Inferred From Aggregation Modelling
	Karrer M.; Seifert A.; Siewert C.; Ori D.; von Lerber A.; Kneifel S.
发表日期	2020
ISSN	19422466
卷号	12 期号:8
英文摘要	We generated a large number 105,000 of aggregates composed of various monomer types and sizes using an aggregation model. Combined with hydrodynamic theory, we derived ice particle properties such as mass, projected area, and terminal velocity as a function of monomer number and size. This particle ensemble allows us to study the relation of particle properties with a high level of detail which is often not provided by in situ measurements. The ice particle properties change rather smoothly with monomer number. We find very little differences in all particle properties between monomers and aggregates at sizes below 1 mm which is in contrast to many microphysics schemes. The impact of the monomer type on the particle properties decreases with increasing monomer number. Whether, for example, the terminal velocity of an aggregate is larger or smaller than an equal-size monomer depends mostly on the monomer type. We fitted commonly used power laws as well as Atlas-type relations, which represent the saturation of the terminal velocity at large sizes (terminal velocity asymptotically approaching a limiting value) to the data set and tested the impact of incorporating different levels of complexity with idealized simulations using a 1D Lagrangian super particle model. These simulations indicate that it is sufficient to represent the monomer number dependency of ice particle properties with only two categories (monomers and aggregates). The incorporation of the saturation velocity at larger sizes is found to be important to avoid an overestimation of self-aggregation of larger snowflakes. © 2020. The Authors.
英文关键词	agreggation modeling; cloud microphysics; ice particle properties; Lagrangian modeling; terminal velocity
语种	英语
scopus关键词	Aggregates; Ice; Velocity; Aggregation model; Hydrodynamic theory; In-situ measurement; Limiting values; Particle properties; Saturation velocity; Self aggregation; Terminal velocity; Monomers; algorithm; in situ measurement; modeling; particle size; velocity profile
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/156680
作者单位	Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany; Deutscher Wetterdienst, Offenbach, Germany; Finnish Meteorological Institute, Helsinki, Finland
推荐引用方式 GB/T 7714	Karrer M.,Seifert A.,Siewert C.,et al. Ice Particle Properties Inferred From Aggregation Modelling[J],2020,12(8).
APA	Karrer M.,Seifert A.,Siewert C.,Ori D.,von Lerber A.,&Kneifel S..(2020).Ice Particle Properties Inferred From Aggregation Modelling.Journal of Advances in Modeling Earth Systems,12(8).
MLA	Karrer M.,et al."Ice Particle Properties Inferred From Aggregation Modelling".Journal of Advances in Modeling Earth Systems 12.8(2020).