Journal ArticleDOI
Experiments in Rainfall Estimation with a Polarimetric Radar in a Subtropical Environment
TLDR
In this paper, a unique dataset consisting of high-resolution polarimetric radar measurements and dense rain gauge and disdrometer observations collected in east-central Florida during the summer of 1998 was examined.Abstract:
A unique dataset consisting of high-resolution polarimetric radar measurements and dense rain gauge and disdrometer observations collected in east-central Florida during the summer of 1998 was examined. Comparison of the radar measurements and radar parameters computed from the disdrometer observations supported previous studies, which indicate that oscillating drops in the free atmosphere have more spherical apparent shapes in the mean than equilibrium shapes. Radar‐disdrometer comparisons improved markedly when using an empirical axis ratio relation developed from observational studies and representing more spherical drop shapes. Fixedform power-law rainfall estimators for radar reflectivity ( ZH), specific differential phase (KDP), specific differential phase‐differential reflectivity ( KDP, ZDR), and radar reflectivity‐differential reflectivity ( ZH, ZDR) were then determined using the disdrometer observations. Relations were produced for both equilibrium shapes and the empirical axis ratios. Polarimetric rainfall estimators based on more spherical shapes gave significantly improved performance. However, the improvement was largely in bias mitigation. Rainfall estimates with the ZH‐ZDR measurement pair had the highest correlation with rain gauge observations, the smallest range in bias factors from storm to storm, and the smallest root-mean-square error.read more
Citations
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Journal ArticleDOI
Precipitation: Measurement, remote sensing, climatology and modeling
Silas Michaelides,Vincenzo Levizzani,Emmanouil N. Anagnostou,Peter Bauer,Takis Kasparis,John E. Lane +5 more
TL;DR: In this paper, a review of the current status and main outstanding issues related to precipitation forecasting are discussed, providing a basic structure for research coordination aimed at the improvement of modeling, observation and data assimilation applicable to global and regional scales.
Journal ArticleDOI
Rainfall Estimation with a Polarimetric Prototype of WSR-88D
TL;DR: In this paper, a synthetic polarimetric algorithm has been developed for rainfall estimation, which results in significant reduction in the rms errors of hourly rain estimates when compared with the conventional nonpolarimetric relation.
Journal ArticleDOI
A Statistical and Physical Description of Hydrometeor Distributions in Colorado Snowstorms Using a Video Disdrometer
TL;DR: In this paper, a two-dimensional video disdrometer was used to determine the form of particle size distributions (PSDs) and search for useful interrelationships among the governing parameters of assumed distribution forms and environmental factors.
Journal ArticleDOI
Calibration Issues of Dual-Polarization Radar Measurements
TL;DR: In this paper, a self-consistency approach was proposed to reduce the impact of variability in the drop size distribution and raindrop shape on the quality of the radar reflectivity Z. The proposed scheme was tested on a large polarimetric dataset obtained during the Joint Polarization Experiment in Oklahoma and yielded an accura...
Journal ArticleDOI
Analysis of Video Disdrometer and Polarimetric Radar Data to Characterize Rain Microphysics in Oklahoma
TL;DR: In this paper, data from three 2D video disdrometers and an S-band polarimetric radar are used to characterize rain microphysics in Oklahoma and a method of sorting and averaging based on two parameters (SATP) is proposed.
References
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Journal ArticleDOI
Practical Aspects of Radar Rainfall Estimation Using Specific Differential Propagation Phase
TL;DR: In this article, the effect of inhomogeneous rainfall paths (over which KDP is estimated) on the choice of rainfall rate algorithms is studied as a function of rain pathlength. But this bias is evaluated and compared for different rainfall algorithms, for different pathlengths.
Journal ArticleDOI
Effects of random inhomogeneity on radar measurements and rain rate estimation
TL;DR: A two-level drop size distribution (DSD) model is proposed, in which DSD parameters are assumed to be variable for representing the sampling effects and the dependence of statistical moments on the variation of D SD parameters are calculated and applied to radar-based rain estimation.