Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/524969
Title: Evaluation of a New Polarimetric Algorithm for Rain-Path Attenuation Correction of X-Band Radar Observations Against Disdrometer
Authors: Inst. of Environ. Res. & Sustainable Dev., Nat. Obs. of Athens, Athens, Greece;Kalogiros, John ; Anagnostou, Marios N. ; Anagnostou, Emmanouil N. ; Montopoli, M. ; Picciotti, Errico ; Marzano, F.S.
subject: atmospheric measuring apparatus; atmospheric techniques; calibration; remote sensing by radar; SCOP algorithm; X-band dual-polarization radar data; X-band radar observations; ZPHI algorithm; backscattering differential phase shift; differential rain-path attenuation values; differential reflectivity; disdrometer data; horizontal-polarization reflectivity; noise measurement; polarimetric algorithm evaluation; radar calibration; radar reflectivities; rain-path attenuation correction; self-consistent with optimal parameterization; specific attenuation coefficients; Disdrometer; X-band; dual-polarization weather radar; rain-path attenuation;
Year: 2014
Publisher: IEEE
Abstract: A new algorithm called self-consistent with optimal parameterization (SCOP) for attenuation correction of radar reflectivities at low elevation angles is developed and evaluated. The SCOP algorithm, which uses optimal parameterization and best-fitted functions of specific attenuation coefficients and backscattering differential phase shift, is applied to X-band dual-polarization radar data and evaluated on the basis of radar observables calculated from disdrometer data at a distance of 35 km from the radar. The performance of the SCOP algorithm is compared with other algorithms [reflectivity-differential phase shift (ZPHI) and full self-consistent (FSC)] presented in the literature. Overall, the new algorithm performs similarly to ZPHI for the attenuation correction of horizontal-polarization reflectivity, whereas the FSC algorithm exhibits significant underestimation. The ZPHI algorithm tends to overestimate small rain-path attenuation values. All algorithms exhibit significant underestimation at high differential rain-path attenuation values, probably due to the presence of hail along the path of the radar beam during the examined cases. The new SCOP algorithm has the potential to retrieve profiles of horizontal and differential reflectivities with better accuracy than the other algorithms due to the low error of the parameterization functions used in it. Typical radar calibration biases and measurement noise are sufficient requirements to ensure low errors of the proposed algorithm. A real-time method to calibrate the differential reflectivity without additional measurements is also described.
URI: http://localhost/handle/Hannan/239509
http://localhost/handle/Hannan/524969
ISSN: 0196-2892
volume: 52
issue: 2
Appears in Collections:2014

Files in This Item:
File SizeFormat 
6504500.pdf1.96 MBAdobe PDF
Title: Evaluation of a New Polarimetric Algorithm for Rain-Path Attenuation Correction of X-Band Radar Observations Against Disdrometer
Authors: Inst. of Environ. Res. & Sustainable Dev., Nat. Obs. of Athens, Athens, Greece;Kalogiros, John ; Anagnostou, Marios N. ; Anagnostou, Emmanouil N. ; Montopoli, M. ; Picciotti, Errico ; Marzano, F.S.
subject: atmospheric measuring apparatus; atmospheric techniques; calibration; remote sensing by radar; SCOP algorithm; X-band dual-polarization radar data; X-band radar observations; ZPHI algorithm; backscattering differential phase shift; differential rain-path attenuation values; differential reflectivity; disdrometer data; horizontal-polarization reflectivity; noise measurement; polarimetric algorithm evaluation; radar calibration; radar reflectivities; rain-path attenuation correction; self-consistent with optimal parameterization; specific attenuation coefficients; Disdrometer; X-band; dual-polarization weather radar; rain-path attenuation;
Year: 2014
Publisher: IEEE
Abstract: A new algorithm called self-consistent with optimal parameterization (SCOP) for attenuation correction of radar reflectivities at low elevation angles is developed and evaluated. The SCOP algorithm, which uses optimal parameterization and best-fitted functions of specific attenuation coefficients and backscattering differential phase shift, is applied to X-band dual-polarization radar data and evaluated on the basis of radar observables calculated from disdrometer data at a distance of 35 km from the radar. The performance of the SCOP algorithm is compared with other algorithms [reflectivity-differential phase shift (ZPHI) and full self-consistent (FSC)] presented in the literature. Overall, the new algorithm performs similarly to ZPHI for the attenuation correction of horizontal-polarization reflectivity, whereas the FSC algorithm exhibits significant underestimation. The ZPHI algorithm tends to overestimate small rain-path attenuation values. All algorithms exhibit significant underestimation at high differential rain-path attenuation values, probably due to the presence of hail along the path of the radar beam during the examined cases. The new SCOP algorithm has the potential to retrieve profiles of horizontal and differential reflectivities with better accuracy than the other algorithms due to the low error of the parameterization functions used in it. Typical radar calibration biases and measurement noise are sufficient requirements to ensure low errors of the proposed algorithm. A real-time method to calibrate the differential reflectivity without additional measurements is also described.
URI: http://localhost/handle/Hannan/239509
http://localhost/handle/Hannan/524969
ISSN: 0196-2892
volume: 52
issue: 2
Appears in Collections:2014

Files in This Item:
File SizeFormat 
6504500.pdf1.96 MBAdobe PDF
Title: Evaluation of a New Polarimetric Algorithm for Rain-Path Attenuation Correction of X-Band Radar Observations Against Disdrometer
Authors: Inst. of Environ. Res. & Sustainable Dev., Nat. Obs. of Athens, Athens, Greece;Kalogiros, John ; Anagnostou, Marios N. ; Anagnostou, Emmanouil N. ; Montopoli, M. ; Picciotti, Errico ; Marzano, F.S.
subject: atmospheric measuring apparatus; atmospheric techniques; calibration; remote sensing by radar; SCOP algorithm; X-band dual-polarization radar data; X-band radar observations; ZPHI algorithm; backscattering differential phase shift; differential rain-path attenuation values; differential reflectivity; disdrometer data; horizontal-polarization reflectivity; noise measurement; polarimetric algorithm evaluation; radar calibration; radar reflectivities; rain-path attenuation correction; self-consistent with optimal parameterization; specific attenuation coefficients; Disdrometer; X-band; dual-polarization weather radar; rain-path attenuation;
Year: 2014
Publisher: IEEE
Abstract: A new algorithm called self-consistent with optimal parameterization (SCOP) for attenuation correction of radar reflectivities at low elevation angles is developed and evaluated. The SCOP algorithm, which uses optimal parameterization and best-fitted functions of specific attenuation coefficients and backscattering differential phase shift, is applied to X-band dual-polarization radar data and evaluated on the basis of radar observables calculated from disdrometer data at a distance of 35 km from the radar. The performance of the SCOP algorithm is compared with other algorithms [reflectivity-differential phase shift (ZPHI) and full self-consistent (FSC)] presented in the literature. Overall, the new algorithm performs similarly to ZPHI for the attenuation correction of horizontal-polarization reflectivity, whereas the FSC algorithm exhibits significant underestimation. The ZPHI algorithm tends to overestimate small rain-path attenuation values. All algorithms exhibit significant underestimation at high differential rain-path attenuation values, probably due to the presence of hail along the path of the radar beam during the examined cases. The new SCOP algorithm has the potential to retrieve profiles of horizontal and differential reflectivities with better accuracy than the other algorithms due to the low error of the parameterization functions used in it. Typical radar calibration biases and measurement noise are sufficient requirements to ensure low errors of the proposed algorithm. A real-time method to calibrate the differential reflectivity without additional measurements is also described.
URI: http://localhost/handle/Hannan/239509
http://localhost/handle/Hannan/524969
ISSN: 0196-2892
volume: 52
issue: 2
Appears in Collections:2014

Files in This Item:
File SizeFormat 
6504500.pdf1.96 MBAdobe PDF