Universität zu Köln

Leinonen, Jussi ORCID: 0000-0002-6560-6316, Kneifel, Stefan ORCID: 0000-0003-2220-2968 and Hogan, Robin J. (2018). Evaluation of the Rayleigh-Gans approximation for microwave scattering by rimed snowflakes. Q. J. R. Meteorol. Soc., 144. S. 77 - 89. HOBOKEN: WILEY. ISSN 1477-870X

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Abstract

We have evaluated the applicability of the Rayleigh-Gans approximation (RGA) and self-similar Rayleigh-Gans approximation (SSRGA) for microwave scattering by rimed snowflakes. This study extends previous findings that showed that, for unrimed snowflakes, the RGA is in good agreement with the discrete dipole approximation (DDA), which we used as a reference method. When riming is introduced, the RGA-derived scattering properties of individual snowflakes deviate significantly - up to 20-25 dB for the backscattering cross-section in the W band - from the corresponding DDA results. In contrast, the average scattering properties given by RGA are in good agreement with DDA for all but the most heavily rimed snowflakes: the mean bias in the backscattering cross-section rarely exceeds 1 dB for light and moderate riming. We also found that an adjustment that accounts for the non-spherical shapes of ice crystals can help eliminate the small constant bias found in RGA in earlier studies. The SSRGA approximates the RGA results with good accuracy at all degrees of riming, indicating that it, too, can be used with up to moderately rimed snowflakes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Leinonen, Jussi UNSPECIFIED orcid.org/0000-0002-6560-6316 UNSPECIFIED Kneifel, Stefan UNSPECIFIED orcid.org/0000-0003-2220-2968 UNSPECIFIED Hogan, Robin J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-166277
DOI:	10.1002/qj.3093
Journal or Publication Title:	Q. J. R. Meteorol. Soc.
Volume:	144
Page Range:	S. 77 - 89
Date:	2018
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1477-870X
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 SNOWFALL MICROPHYSICS; RADAR BACKSCATTERING; LIGHT-SCATTERING; FREQUENCY; AGGREGATE; SIGNATURES; PARTICLES Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16627