Universität zu Köln

Leinonen, J., Kneifel, S., Moisseev, D., Tyynela, J., Tanelli, S. and Nousiainen, T. (2012). Evidence of nonspheroidal behavior in millimeter-wavelength radar observations of snowfall. J. Geophys. Res.-Atmos., 117. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-8996

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Abstract

Recent modeling results have indicated that, in general, idealized homogeneous spheroidal models of ice crystals and snowflakes cannot consistently describe radar backscattering from snowfall when the radar wavelengths are on the order of the snowflake size. In this paper, we provide empirical evidence supporting this prediction by analyzing collocated airborne radar measurements at 13.4 GHz, 35.6 GHz and 94 GHz. The analysis is performed by applying a recently developed method making use of two simultaneously measured dualq-frequency ratios, allowing one to distinguish between the multifrequency backscattering behavior of detailed aggregate snow models and that of homogeneous spheroids. We demonstrate that in some naturally occurring cases, detailed snowflake models, which account for their complex structure, are required to describe backscattering by these particles in a manner that is consistent over multiple wavelengths. This implies that the spheroidal approximation is not always adequate as a snowflake shape model in radar retrievals at this wavelength range.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Leinonen, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kneifel, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moisseev, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tyynela, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tanelli, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nousiainen, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-482829
DOI:	10.1029/2012JD017680
Journal or Publication Title:	J. Geophys. Res.-Atmos.
Volume:	117
Date:	2012
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-8996
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ICE; SCATTERING; PARTICLE; BACKSCATTERING; SURFACE; RETRIEVAL; RATIO; WATER; SIZE; BAND Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48282