DOI: 10.1002/jgrd.50138
论文题名: Empirical conversion of the vertical profile of reflectivity from Ku-band to S-band frequency
作者: Cao Q. ; Hong Y. ; Qi Y. ; Wen Y. ; Zhang J. ; Gourley J.J. ; Liao L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 4 起始页码: 1814
结束页码: 1825
语种: 英语
英文关键词: DFR
; PSD
; Radar
; TRMM
; VPR
Scopus关键词: Clouds
; Particle size analysis
; Radar
; Rain
; Reflection
; Scattering
; Snow
; DFR
; PSD
; Quantitative precipitation estimation
; TRMM
; Tropical rainfall measuring missions
; Vertical profile of reflectivities
; VPR
; Weather surveillance radar
; Radar measurement
; atmospheric correction
; empirical analysis
; frequency analysis
; matrix
; particle size
; precipitation (climatology)
; satellite data
; TRMM
; vertical profile
; United States
英文摘要: This paper presents an empirical method for converting reflectivity from Ku-band (13.8 GHz) to S-band (2.8 GHz) for several hydrometeor species, which facilitates the incorporation of Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) measurements into quantitative precipitation estimation (QPE) products from the U.S. Next-Generation Radar (NEXRAD). The development of empirical dual-frequency relations is based on theoretical simulations, which have assumed appropriate scattering and microphysical models for liquid and solid hydrometeors (raindrops, snow, and ice/hail). Particle phase, shape, orientation, and density (especially for snow particles) have been considered in applying the T-matrix method to compute the scattering amplitudes. Gamma particle size distribution (PSD) is utilized to model the microphysical properties in the ice region, melting layer, and raining region of precipitating clouds. The variability of PSD parameters is considered to study the characteristics of dual-frequency reflectivity, especially the variations in radar dual-frequency ratio (DFR). The empirical relations between DFR and Ku-band reflectivity have been derived for particles in different regions within the vertical structure of precipitating clouds. The reflectivity conversion using the proposed empirical relations has been tested using real data collected by TRMM-PR and a prototype polarimetric WSR-88D (Weather Surveillance Radar 88 Doppler) radar, KOUN. The processing and analysis of collocated data demonstrate the validity of the proposed empirical relations and substantiate their practical significance for reflectivity conversion, which is essential to the TRMM-based vertical profile of reflectivity correction approach in improving NEXRAD-based QPE. Key PointsInvestigate the vertical structure of precipitationDevelop empirical relations for space-borne and ground radarsProvide an approach of TRMM-based VPR correction © 2013. American Geophysical Union. All Rights Reserved. 资助项目: NNX11AL78G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63929
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: Advanced Radar Research Center, University of Oklahoma, Normanm, OK, United States; Hydrometeorology and Remote Sensing Laboratory, Advanced Radar Research Center, National Weather Center, 120 David L. Boren Blvd., Norman, OK 73072, United States; School of Civil Engineering and Environmental Sciences, University of Oklahoma, Normanm, OK, United States; NOAA/National Severe Storms Laboratory, Normanm, OK, United States; Goddard Earth Sciences Technology and Research, Morgan State University, Greenbelt, MD, United States
Recommended Citation:
Cao Q.,Hong Y.,Qi Y.,et al. Empirical conversion of the vertical profile of reflectivity from Ku-band to S-band frequency[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(4)