DOI: 10.1002/2013JD020386
论文题名: On using the relationship between Doppler velocity and radar reflectivity to identify microphysical processes in midlatitudinal ice clouds
作者: Kalesse H. ; Kollias P. ; Szyrmer W.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 12168
结束页码: 12179
语种: 英语
英文关键词: cloud Doppler radar
; ice cloud microphysics
; ice clouds
Scopus关键词: Clouds
; Doppler radar
; Particle size analysis
; Physics
; Principal component analysis
; Reflection
; Velocity
; Atmospheric radiation measurements
; Ice cloud microphysics
; Ice clouds
; Long-term measurements
; Microphysical process
; Radar reflectivities
; Southern great plains
; Standard deviation
; Air
; cloud microphysics
; Doppler radar
; frequency-magnitude distribution
; ground-based measurement
; ice cover
; particle size
; power law
; Great Plains
英文摘要: Ground-based 35 GHz profiling Doppler cloud radar observations of ice clouds were used to derive the power law relation between Doppler velocity Vd and radar reflectivity Z (Vd = aZb). By removing the vertical air motion from Vd , the power law can be rewritten as Vt = aZb with Vt being the reflectivity-weighted particle terminal fall velocity. Profiles of this relation are variable with height. An attempt was made to relate this variability to the dominant microphysical processes in different layers of the cloud. Based on that, the possibility of using profiles of the parameters a and b to distinguish different microphysical regimes was explored. The methodology was applied to long-term measurements (January 1997 to December 2010) at the Atmospheric Radiation Measurement site in the Southern Great Plains. Principal component analysis was used to determine the modes of the profiles that explain most of the observed variance in the observations. Profile-averaged means and standard deviations of parameters a and b amounted to 0.65 ± 0.42 and 0.03 ± 0.19, respectively. Furthermore, three commonly used microphysical relations related to bulk quantities were used to determine values of a and b. These results were found to compare reasonably well with the values obtained from the radar observations. Finally, microphysical considerations showed that radar-derived values of parameter b can be explained in terms of particle size distribution moment changes. Key Points Climatology of profiles of cloud radar observables in ice clouds is made Microphysics is examined by profiles of Doppler velocity-reflectivity relation ©2013. 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/63192
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 Atmospheric and Oceanic Sciences, McGill University Quebec, Burnside Hall, 805 Sherbrooke St. W., Montreal, QC H3A 0B9, Canada
Recommended Citation:
Kalesse H.,Kollias P.,Szyrmer W.. On using the relationship between Doppler velocity and radar reflectivity to identify microphysical processes in midlatitudinal ice clouds[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)