Correction of Radar Reflectivity and Differential Reflectivity for Rain Attenuation at X Band. Part II: Evaluation and Application

Abstract In this paper, the attenuation-correction methodology presented in Part I is applied to radar measurements observed by the multiparameter radar at the X-band wavelength (MP-X) of the National Research Institute for Earth Science and Disaster Prevention (NIED), and is evaluated by comparison with scattering simulations using ground-based disdrometer data. Further, effects of attenuation on the estimation of rainfall amounts and drop size distribution parameters are also investigated. The joint variability of the corrected reflectivity and differential reflectivity show good agreement with scattering simulations. In addition, specific attenuation and differential attenuation, which are derived in the correction procedure, show good agreement with scattering simulations. In addition, a composite rainfall-rate algorithm is proposed and evaluated by comparison with eight gauges. The radar-rainfall estimates from the uncorrected (or observed) ZH produce severe underestimation, even at short ranges from...

[1]  Alexander V. Ryzhkov,et al.  Assessment of Rainfall Measurement That Uses Specific Differential Phase , 1996 .

[2]  Eugenio Gorgucci,et al.  Drop size distribution retrieval from polarimetric radar measurements , 2002 .

[3]  V. Chandrasekar,et al.  Processing and Interpretation of Coherent Dual-Polarized Radar Measurements , 1993 .

[4]  Eugenio Gorgucci,et al.  Measurement of Mean Raindrop Shape from Polarimetric Radar Observations , 2000 .

[5]  Eugenio Gorgucci,et al.  Raindrop Size Distribution in Different Climatic Regimes from Disdrometer and Dual-Polarized Radar Analysis , 2003 .

[6]  Eugenio Gorgucci,et al.  A Methodology for Estimating the Parameters of a Gamma Raindrop Size Distribution Model from Polarimetric Radar Data: Application to a Squall-Line Event from the TRMM/Brazil Campaign , 2002 .

[7]  John Hubbert,et al.  An Iterative Filtering Technique for the Analysis of Copolar Differential Phase and Dual-Frequency Radar Measurements , 1995 .

[8]  Anthony J. Illingworth,et al.  The Need to Represent Raindrop Size Spectra as Normalized Gamma Distributions for the Interpretation of Polarization Radar Observations , 2002 .

[9]  Jacques Testud,et al.  Validation of the Rain Profiling Algorithm “ZPHI” from the C-Band Polarimetric Weather Radar in Darwin , 2001 .

[10]  Sergey Y. Matrosov,et al.  X-Band Polarimetric Radar Measurements of Rainfall , 2002 .

[11]  Eugenio Gorgucci,et al.  Estimation of Raindrop Size Distribution Parameters from Polarimetric Radar Measurements , 2002 .

[12]  Alexander V. Ryzhkov,et al.  Advantages of Rain Measurements Using Specific Differential Phase , 1996 .

[13]  V. Chandrasekar,et al.  Polarimetric Doppler Weather Radar: Principles and Applications , 2001 .

[14]  Karen Andsager,et al.  Laboratory Measurements of Axis Ratios for Large Raindrops , 1999 .

[15]  Alexander V. Ryzhkov,et al.  Polarimetric Rainfall Estimation in the Presence of Anomalous Propagation , 1998 .

[16]  V. Chandrasekar,et al.  Correcting C-band radar reflectivity and differential reflectivity data for rain attenuation: a self-consistent method with constraints , 2001, IEEE Trans. Geosci. Remote. Sens..

[17]  K. Beard,et al.  A New Model for the Equilibrium Shape of Raindrops , 1987 .

[18]  Koyuru Iwanami,et al.  Semi‐operational rainfall observations with X‐band multi‐parameter radar , 2005 .

[19]  H. R. Pruppacher,et al.  A wind tunnel investigation of the internal circulation and shape of water drops falling at terminal velocity in air , 1970 .

[20]  I. Zawadzki,et al.  On Radar-Raingage Comparison , 1975 .

[21]  Alexander V. Ryzhkov,et al.  Precipitation and Attenuation Measurements at a 10-cm Wavelength , 1995 .

[22]  Eugenio Gorgucci,et al.  Rainfall Estimation from Polarimetric Radar Measurements: Composite Algorithms Immune to Variability in Raindrop Shape–Size Relation , 2001 .

[23]  V. Chandrasekar,et al.  Evaluation of a New Polarimetrically Based Z–R Relation , 2004 .

[24]  V. Chandrasekar,et al.  Correction of Radar Reflectivity and Differential Reflectivity for Rain Attenuation at X Band. Part I: Theoretical and Empirical Basis , 2005 .

[25]  Jacques Testud,et al.  The Rain Profiling Algorithm Applied to Polarimetric Weather Radar , 2000 .

[26]  Alexander V. Ryzhkov,et al.  Considerations for Polarimetric Upgrades to Operational WSR-88D Radars , 2000 .

[27]  Eugenio Gorgucci,et al.  A procedure to calibrate multiparameter weather radar using properties of the rain medium , 1999, IEEE Trans. Geosci. Remote. Sens..