Universität zu Köln

Hogan, Robin J., Honeyager, Ryan ORCID: 0000-0003-0753-9511, Tyynela, Jani ORCID: 0000-0002-4360-3800 and Kneifel, Stefan ORCID: 0000-0003-2220-2968 (2017). Calculating the millimetre-wave scattering phase function of snowflakes using the self-similar Rayleigh-Gans Approximation. Q. J. R. Meteorol. Soc., 143 (703). S. 834 - 845. HOBOKEN: WILEY. ISSN 1477-870X

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Abstract

Exploitation ofmillimetre-wave radiometer and radar observations of ice clouds and snow requires the ability to model the scattering properties of snowflakes. This article extends the Self-Similar Rayleigh-Gans Approximation (SSRGA) for rapid computation of the backscatter cross-section of ice aggregates, to compute the full scattering phase function, the scattering and absorption cross-sections and the asymmetry factor. We also show that the Rayleigh-Gans Approximation (RGA) may be improved to represent the enhanced scattering and absorption when the monomers from which the aggregate is composed are non-spherical. The new model is shown to perform well when compared to benchmark 94 and 183 GHz Discrete Dipole Approximation (DDA) calculations of the scattering by simulated unrimed aggregates of maximum dimension up to 1 cm that have a mass-size relationship in the range observed from aircraft. For denser particles, such as would result from riming, the validity of the underlying RGA becomes questionable and both the backscatter and scattering cross-sections can be underestimated by a factor of 2.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hogan, Robin J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Honeyager, Ryan UNSPECIFIED orcid.org/0000-0003-0753-9511 UNSPECIFIED Tyynela, Jani UNSPECIFIED orcid.org/0000-0002-4360-3800 UNSPECIFIED Kneifel, Stefan UNSPECIFIED orcid.org/0000-0003-2220-2968 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-247189
DOI:	10.1002/qj.2968
Journal or Publication Title:	Q. J. R. Meteorol. Soc.
Volume:	143
Number:	703
Page Range:	S. 834 - 845
Date:	2017
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 ICE WATER-CONTENT; MICROWAVE-FREQUENCIES; AGGREGATE SNOWFLAKES; RADIATIVE-TRANSFER; RADAR SCATTERING; LIGHT-SCATTERING; PARTICLE-SIZE; CIRRUS; PRECIPITATION; ASSIMILATION Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24718