DOI: 10.1029/2017JD028186
Scopus记录号: 2-s2.0-85048973678
论文题名: How Does Riming Affect Dual-Polarization Radar Observations and Snowflake Shape?
作者: Li H. ; Moisseev D. ; von Lerber A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 11 起始页码: 6070
结束页码: 6081
语种: 英语
英文关键词: dual-polarization radar
; ice particle aspect ratio
; rime mass fraction
; snowfall
Scopus关键词: aspect
; bulk density
; hydrometeorology
; model
; polarization
; precipitation (climatology)
; radar
; reflectivity
; shape
; snow
; Finland
; Hyytiala
; Pirkanmaa
英文摘要: 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 Hyytiälä, 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 Ze, Zdr, and Kdp for inferring riming fraction is analyzed. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113720
Appears in Collections: 气候减缓与适应
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作者单位: Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of HelsinkiHelsinki, Finland; Finnish Meteorological Institute, Helsinki, Finland
Recommended Citation:
Li H.,Moisseev D.,von Lerber A.. How Does Riming Affect Dual-Polarization Radar Observations and Snowflake Shape?[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(11)