Universität zu Köln

Ori, Davide ORCID: 0000-0002-9964-2200, von Terzi, Leonie, Karrer, Markus and Kneifel, Stefan ORCID: 0000-0003-2220-2968 (2021). snowScatt 1.0: consistent model of microphysical and scattering properties of rimed and unrimed snowflakes based on the self-similar Rayleigh-Gans approximation. Geosci. Model Dev., 14 (3). S. 1511 - 1532. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1991-9603

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Abstract

More detailed observational capabilities in the microwave (MW) range and advancements in the details of microphysical schemes for ice and snow demand increasing complexity to be included in scattering databases. The majority of existing databases rely on the discrete dipole approximation (DDA) whose high computational costs limit either the variety of particle types or the range of parameters included, such as frequency, temperature, and particle size. The snowScatt tool is innovative in that it provides consistent microphysical and scattering properties of an ensemble of 50 000 snowflake aggregates generated with different physical particle models. Many diverse snowflake types, including rimed particles and aggregates of different monomer composition, are accounted for. The scattering formulation adopted by snowScatt is based on the self-similar Rayleigh-Gans approximation (SSRGA), which is capable of modeling the scattering properties of large ensembles of particles. Previous comparisons of SSRGA and DDA are extended in this study by including unrimed and rimed aggregates up to centimeter sizes and frequencies up to the sub-millimeter spectrum. The results generally reveal the wide applicability of the SSRGA method for active and passive MW applications. Unlike DDA databases, the set of SSRGA parameters can be used to infer scattering properties at any frequency and refractive index; snowScatt also provides tools to derive the SSRGA parameters for new sets of particle structures, which can be easily included in the library. The flexibility of the snowScatt tool with respect to applications that require continuously changing definitions of snow properties is demonstrated in a forward simulation example based on the output of the predicted particle properties (P3) scheme. The snowScatt tool provides the same level of flexibility as commonly used T-matrix solutions, while the computed scattering properties reach the level of accuracy of detailed discrete dipole approximation calculations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ori, Davide UNSPECIFIED orcid.org/0000-0002-9964-2200 UNSPECIFIED von Terzi, Leonie UNSPECIFIED UNSPECIFIED UNSPECIFIED Karrer, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Kneifel, Stefan UNSPECIFIED orcid.org/0000-0003-2220-2968 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-565389
DOI:	10.5194/gmd-14-1511-2021
Journal or Publication Title:	Geosci. Model Dev.
Volume:	14
Number:	3
Page Range:	S. 1511 - 1532
Date:	2021
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1991-9603
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DISCRETE-DIPOLE APPROXIMATION; ICE PARTICLES; FROZEN HYDROMETEORS; RADIATIVE-TRANSFER; RADAR SIGNATURES; LIGHT-SCATTERING; WAVE SCATTERING; FALL SPEEDS; MICROWAVE; CLOUD Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56538