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RISSources of Errors in Rainfall Measurements by Polarimetric Radar: Variability of Drop Size Distributions, Observational Noise, and Variation of Relationships between R and Polarimetric Parameters
Publisher: American Meteorological Society
Abstract: Using a set of long-term disdrometric data and of actual radar measurements from the McGill S-band operational polarimetric radar, several sources of errors in rain measurement with polarimetric radar are explored in order ...
Variability of Drop Size Distributions: Noise and Noise Filtering in Disdrometric Data
Publisher: American Meteorological Society
Abstract: Disdrometric measurements are affected by the spurious variability due to drop sorting, small sampling volume, and instrumental noise. As a result, analysis methods that use least squares regression to derive rainfall ...
Variability of Drop Size Distributions: Time-Scale Dependence of the Variability and Its Effects on Rain Estimation
Publisher: American Meteorological Society
Abstract: A systematic and intensive analysis is performed on 5 yr of reliable disdrometric data (over 20 000 one-minute drop size distributions, DSDs) to investigate the variability of DSDs in the Montreal, Quebec, Canada, area. ...
Error Statistics of VPR Corrections in Stratiform Precipitation
Publisher: American Meteorological Society
Abstract: Errors in surface rainfall estimates that are caused by ignoring the vertical profile of reflectivity (VPR) and range effects have been assessed by simulating how fine-resolution 3D reflectivity measurements at close ranges ...
Modeling the Variability of Drop Size Distributions in Space and Time
Publisher: American Meteorological Society
Abstract: The information on the time variability of drop size distributions (DSDs) as seen by a disdrometer is used to illustrate the structure of uncertainty in radar estimates of precipitation. Based on this, a method to generate ...
Real-Time Comparisons of VPR-Corrected Daily Rainfall Estimates with a Gauge Mesonet
Publisher: American Meteorological Society
Abstract: The relative skill of two vertical-profile-of-reflectivity (VPR) correction techniques for daily accumulations on a selected dataset and a real-time dataset has been verified. The first technique (C1) adjusts the 1-h ...
Cross Validation of TRMM PR Reflectivity Profiles Using 3D Reflectivity Composite from the Ground-Based Radar Network over the Korean Peninsula
Publisher: American Meteorological Society
Abstract: he Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) measures reflectivity downward from space and provides observations of the vertical distributions of precipitation over land as well as the ocean. It ...
A Preliminary Analysis of Spatial Variability of Raindrop Size Distributions during Stratiform Rain Events
Publisher: American Meteorological Society
Abstract: The spatial variability of raindrop size distributions (DSDs) and precipitation fields is investigated utilizing disdrometric measurements from the four Precipitation Occurrence Sensor Systems (POSS) and radar reflectivity ...
A General Approach to Double-Moment Normalization of Drop Size Distributions
Publisher: American Meteorological Society
Abstract: Normalization of drop size distributions (DSDs) is reexamined here. First, an extension of the scaling normalization that uses one moment of the DSD as a scaling parameter to a more general scaling normalization that uses ...
Identification and Removal of Ground Echoes and Anomalous Propagation Using the Characteristics of Radar Echoes
Publisher: American Meteorological Society
Abstract: This paper explores the removal of normal ground echoes (GREs) and anomalous propagation (AP) in ground-based radars using a fuzzy logic approach. Membership functions and their weights are derived from the characteristics ...