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Erschienen in:
Polarization, Scattering, and Propagation of Electromagnetic Waves Kapitel lesen Erstes Kapitel lesen

2019 | OriginalPaper | Buchkapitel

6. Data Quality and Measurement Errors

verfasst von : Alexander V. Ryzhkov, Dusan S. Zrnic

Erschienen in: Radar Polarimetry for Weather Observations

Verlag: Springer International Publishing

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Abstract

Various system and environmental effects on the quality of polarimetric measurements are discussed in this chapter. It starts with calibration of the reflectivity factor Z and differential reflectivity ZDR. The biases in Z and ZDR caused by attenuation/differential attenuation in rain and hail as well as wet radome are illustrated and quantified. Various techniques for attenuation/differential attenuation correction at different radar wavelengths are described, and numerous results of correction are presented. The effects of partial beam blockage on the Z, ZDR, and ρhv fields are demonstrated, and ways to mitigate these are suggested. Contamination of radar signals by ground clutter is reviewed, the method used on the WSR-88D is briefly described, and potential of the polarimetric information to better identify ground clutter is suggested. Contamination of the radar variables by white noise is explained, and corrections are outlined. Progressive beam broadening with range and stronger impact of nonuniform beam filling are listed as culprits for the deterioration of polarimetric variables with range. These effects are demonstrated and approximately quantified. Depolarization by oriented ice crystals also affects the polarimetric variables, and some examples are included. Three-body scattering signature in differential reflectivity and correlation coefficient is shown and conceptually explained. Finally, statistical errors associated with computations of the polarimetric variables and spectral moments are quantified.

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Vorheriges Kapitel Polarimetric Variables
Nächstes Kapitel Polarimetric “Fingerprints” of Different Microphysical Processes in Clouds and Precipitation
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Metadaten
Titel
Data Quality and Measurement Errors
verfasst von
Alexander V. Ryzhkov
Dusan S. Zrnic
Copyright-Jahr
2019
Buch
Radar Polarimetry for Weather Observations

Print ISBN: 978-3-030-05092-4

Electronic ISBN: 978-3-030-05093-1

Copyright-Jahr: 2019

DOI
https://doi.org/10.1007/978-3-030-05093-1_6