Universität zu Köln

Tridon, Frederic, Battaglia, Alessandro ORCID: 0000-0001-9243-3484, Chase, Randy J., Turk, F. Joseph, Leinonen, Jussi ORCID: 0000-0002-6560-6316, Kneifel, Stefan ORCID: 0000-0003-2220-2968, Mroz, Kamil, Finlon, Joseph, Bansemer, Aaron, Tanelli, Simone, Heymsfield, Andrew J. and Nesbitt, Stephen W. (2019). The Microphysics of Stratiform Precipitation During OLYMPEX: Compatibility Between Triple-Frequency Radar and Airborne In Situ Observations. J. Geophys. Res.-Atmos., 124 (15). S. 8764 - 8793. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-8996

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Abstract

The link between stratiform precipitation microphysics and multifrequency radar observables is thoroughly investigated by exploiting simultaneous airborne radar and in situ observations collected from two aircraft during the OLYMPEX/RADEX (Olympic Mountain Experiment/Radar Definition Experiment 2015) field campaign. Above the melting level, in situ images and triple-frequency radar signatures both indicate the presence of moderately rimed aggregates. Various mass-size relationships of ice particles and snow scattering databases are used to compute the radar reflectivity from the in situ particle size distribution. At Ku and Ka band, the best agreement with radar observations is found when using the self-similar Rayleigh-Gans approximation for moderately rimed aggregates. At W band, a direct comparison is challenging because of the non-Rayleigh effects and of the probable attenuation due to ice aggregates and supercooled liquid water between the two aircraft. A variational method enables the retrieval of the full precipitation profile above and below the melting layer, by combining the observations from the three radars. Even with three radar frequencies, the retrieval of rain properties is challenging over land, where the integrated attenuation is not available. Otherwise, retrieved mean volume diameters and water contents of both solid and liquid precipitation are in agreement with in situ observations and indicate local changes of the degree of riming of ice aggregates, on the scale of 5 km. Finally, retrieval results are analyzed to explore the validity of using continuity constraints on the water mass flux and diameter within the melting layer in order to improve retrievals of ice properties.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tridon, Frederic UNSPECIFIED UNSPECIFIED UNSPECIFIED Battaglia, Alessandro UNSPECIFIED orcid.org/0000-0001-9243-3484 UNSPECIFIED Chase, Randy J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Turk, F. Joseph UNSPECIFIED UNSPECIFIED UNSPECIFIED Leinonen, Jussi UNSPECIFIED orcid.org/0000-0002-6560-6316 UNSPECIFIED Kneifel, Stefan UNSPECIFIED orcid.org/0000-0003-2220-2968 UNSPECIFIED Mroz, Kamil UNSPECIFIED UNSPECIFIED UNSPECIFIED Finlon, Joseph UNSPECIFIED UNSPECIFIED UNSPECIFIED Bansemer, Aaron UNSPECIFIED UNSPECIFIED UNSPECIFIED Tanelli, Simone UNSPECIFIED UNSPECIFIED UNSPECIFIED Heymsfield, Andrew J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nesbitt, Stephen W. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-144207
DOI:	10.1029/2018JD029858
Journal or Publication Title:	J. Geophys. Res.-Atmos.
Volume:	124
Number:	15
Page Range:	S. 8764 - 8793
Date:	2019
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-8996
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; RAYLEIGH-GANS APPROXIMATION; DROP SIZE DISTRIBUTIONS; MULTIPLE-SCATTERING; DOPPLER SPECTRA; RETRIEVAL ALGORITHM; CROSS-SECTIONS; CLOUD CLUSTERS; MELTING LAYER; PARTICLE Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14420