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One-Lag Estimators for Cross-Polarization Measurements
Publisher: American Meteorological Society
Abstract: Estimators of the linear depolarization ratio (LDR) and cross-polarization correlation coefficients (?xh) free from noise biases are devised. The estimators are based on the 1-lag correlation functions. The 1-lag estimators ...
Turbulence and Wind Shear in Layers of Large Doppler Spectrum Width in Stratiform Precipitation
Publisher: American Meteorological Society
Abstract: Weather radar observations of stratiform precipitation often reveal regions having very large measured Doppler spectrum widths, exceeding 7, and sometimes 10, m s?1. These widths are larger than those typically found in ...
On the Alternate Transmission Mode for Polarimetric Phased Array Weather Radar
Publisher: American Meteorological Society
Abstract: ulse-to-pulse switching of polarizations (alternate transmission mode) is considered for polarimetric phased array radar (PAR). It is argued that the performance of the radar in terms of data quality should match or exceed ...
Spectrum Widths from Echo Power Differences Reveal Meteorological Features
Publisher: American Meteorological Society
Abstract: A new Doppler spectrum width estimator using the absolute power differences (APDs) at lag one is presented, and its performance is evaluated using simulated signals as well as those recorded from the National Severe Storms ...
Estimates of Large Spectrum Width from Autocovariances
Publisher: American Meteorological Society
Abstract: The authors demonstrate that there are maximum measurable (saturation) spectrum widths for standard autocovariance techniques, the 0,1-lag autocovariance estimator and the 1,2-lag estimator. The maximal mean measurable ...
Autocorrelation and Cross-Correlation Estimators of Polarimetric Variables
Publisher: American Meteorological Society
Abstract: Herein are proposed novel estimators of differential reflectivity ZDR and correlation coefficient ?hv between horizontally and vertically polarized echoes. The estimators use autocorrelations and cross correlations of the ...
Asymmetric Radar Echo Patterns from Insects
Publisher: American Meteorological Society
Abstract: adar echoes from insects, birds, and bats in the atmosphere exhibit both symmetry and asymmetry in polarimetric patterns. Symmetry refers to similar magnitudes of polarimetric variables at opposite azimuths, and asymmetry ...
Calibrating Differential Reflectivity on the WSR-88D
Publisher: American Meteorological Society
Abstract: A calibration procedure of differential reflectivity on the Weather Surveillance Radar-1988 Doppler (WSR-88D) is described. It has been tested on NOAA's modified WSR-88D research and development polarimetric radar and is ...
Correlation Coefficients between Horizontally and Vertically Polarized Returns from Ground Clutter
Publisher: American Meteorological Society
Abstract: Characteristics of the magnitude and phase of correlation coefficients between horizontally and vertically polarized returns from ground clutter echoes are quantified by analyzing histograms obtained with an 11-cm wavelength ...
Polarimetric Signatures above the Melting Layer in Winter Storms: An Observational and Modeling Study
Publisher: American Meteorological Society
Abstract: olarimetric radar observations above the melting layer in winter storms reveal enhanced differential reflectivity ZDR and specific differential phase shift KDP, collocated with reduced copolar correlation coefficient ?hv; ...
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