How Does Riming Affect Dual-Polarization Radar Observations and Snowflake Shape?

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Li , H , Moisseev , D & von Lerber , A 2018 , ' How Does Riming Affect Dual-Polarization Radar Observations and Snowflake Shape? ' , Journal of Geophysical Research : Atmospheres , vol. 123 , no. 11 , pp. 6070-6081 . https://doi.org/10.1029/2017JD028186

Title: How Does Riming Affect Dual-Polarization Radar Observations and Snowflake Shape?
Author: Li, Haoran; Moisseev, Dmitri; von Lerber, Annakaisa
Other contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)


Date: 2018-06-16
Language: eng
Number of pages: 12
Belongs to series: Journal of Geophysical Research : Atmospheres
ISSN: 2169-897X
DOI: https://doi.org/10.1029/2017JD028186
URI: http://hdl.handle.net/10138/298274
Abstract: As an ice particle grows by riming its shape is expected to change, resulting in a more spherical particle at the later stages of riming. This conceptual model is at the core of the current ice microphysical schemes and used for dual-polarization radar observation based classification of hydrometeors. A quantitative relation between riming and shapes of snowflake aggregates, however, has not been established yet. This study aims to derive this relation by using surface-based precipitation and coinciding dual-polarization radar observations. The observations were collected during four winter seasons, 49 snowstorms, at University of Helsinki measurement station in Hyytiala, Finland. Results show that relation between the differential reflectivity and reflectivity-weighted rime mass fraction is not monotonic and depends on reflectivity-weighted mean diameter. This behavior can be explained by the opposing effects of riming on dual-polarization radar observations. Riming increases particle bulk density, which leads to more pronounced dual-polarization radar signatures. As riming progresses the aspect ratio of snowflake increases slowly until the rime mass fraction value reaches a certainty value after which the aspect ratio increases more rapidly. Finally, coutilization of Z(e), Z(dr), and K-dp for inferring riming fraction is analyzed.
Subject: rime mass fraction
dual-polarization radar
ice particle aspect ratio
snowfall
T-MATRIX COMPUTATIONS
IN-SITU OBSERVATIONS
POLARIMETRIC RADAR
HYDROMETEOR CLASSIFICATION
ICE PARTICLES
MICROPHYSICAL PROPERTIES
WEATHER RADARS
ASPECT RATIOS
SNOWFALL RATE
FALLING SNOW
1172 Environmental sciences
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