Universität zu Köln

Seifert, Axel ORCID: 0000-0001-9760-3550, Leinonen, Jussi ORCID: 0000-0002-6560-6316, Siewert, Christoph and Kneifel, Stefan ORCID: 0000-0003-2220-2968 (2019). The Geometry of Rimed Aggregate Snowflakes: A Modeling Study. J. Adv. Model. Earth Syst., 11 (3). S. 712 - 732. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1942-2466

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Seifert, Axel UNSPECIFIED orcid.org/0000-0001-9760-3550 UNSPECIFIED Leinonen, Jussi UNSPECIFIED orcid.org/0000-0002-6560-6316 UNSPECIFIED Siewert, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Kneifel, Stefan UNSPECIFIED orcid.org/0000-0003-2220-2968 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-154653
DOI:	10.1029/2018MS001519
Journal or Publication Title:	J. Adv. Model. Earth Syst.
Volume:	11
Number:	3
Page Range:	S. 712 - 732
Date:	2019
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	1942-2466
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute for Geophysics and Meteorology
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RADAR SIGNATURES; FALL VELOCITIES; ICE PARTICLES; RIMING DEGREE; LIQUID WATER; MASS; PRECIPITATION; MICROPHYSICS; SNOWFALL; GRAUPEL Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15465