DOI: 10.1002/2016JD025381
论文题名: How dual-polarization radar observations can be used to verify model representation of secondary ice
作者: Sinclair V.A. ; Moisseev D. ; von Lerber A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 18 起始页码: 10954
结束页码: 10970
语种: 英语
英文关键词: dual-polarization radar
; mixed-phase clouds
; secondary ice
; snow
; specific differential phase
; WRF
Scopus关键词: climate modeling
; cloud water
; ice
; mixing ratio
; parameterization
; polarization
; precipitation (climatology)
; radar
; snow
; weather forecasting
英文摘要: In this paper it is discussed how dual-polarization radar observations can be used to verify model representations of secondary ice production. An event where enhanced specific differential phase, Kdp, signatures in snow occur at the altitudes where temperatures lie in the range between −8 and −3°C is investigated. By combining radar and surface-based precipitation observations it is shown that these dual-polarization radar signatures are most likely caused by ice with concentrations exceeding those expected from primary ice parameterizations. It is also shown that the newly formed ice particles readily aggregate, which may explain why Kdp values seem to be capped at 0.2–0.3°/km for a C band radar. For the event of interest, multiple high-resolution (1 km) Weather Research and Forecasting (WRF) model simulations are conducted. When the default versions of the Morrison microphysics schemes were used, the simulated number concentration of frozen hydrometeors is much lower than observed and the simulated ice particle concentrations are comparable with values expected from primary ice parameterizations. Higher ice concentrations, which exceed values expected from primary ice parameterizations, were simulated when ad hoc thresholds for rain and cloud water mixing ratio in the Hallett-Mossop part of the Morrison scheme were removed. These results suggest that the parameterization of secondary ice production in operational weather prediction models needs to be revisited and that dual-polarization radar observations, in conjunction with ancillary observations, can be used to verify them. ©2016. American Geophysical Union. All Rights Reserved. 资助项目: 263333
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62819
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Physics, University of Helsinki, Helsinki, Finland; Finnish Meteorological Institute, Helsinki, Finland; School of Electrical Engineering, Aalto University, Espoo, Finland
Recommended Citation:
Sinclair V.A.,Moisseev D.,von Lerber A.. How dual-polarization radar observations can be used to verify model representation of secondary ice[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(18)