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
An Extended Kalman Filter Framework for Polarimetric X-Band Weather Radar Data Processing
Marc Schneebeli,Alexis Berne +1 more
TL;DR: In a simulation experiment it is found that Kdp and δhυ can be retrieved with higher accuracy and spatial resolution than existing estimators that solely rely on a smoothed measurement of the differential phase shift Ψdp.
Journal ArticleDOI
Unusually high differential attenuation at C band: Results from a two-year analysis of the French Trappes polarimetric radar data
Pierre Tabary,Gianfranco Vulpiani,Jonathan J. Gourley,Anthony J. Illingworth,Robert J. Thompson,Olivier Bousquet +5 more
TL;DR: In this paper, the Smyth and Illingworth constraint was applied to the C-band polarimetric Trappes radar data for attenuation correction in a 2-yr dataset.
Journal ArticleDOI
Estimation of Light Rainfall Using Ku-Band Dual-Polarization Radar
Haonan Chen,V. Chandrasekar +1 more
TL;DR: The excellent performance of Ku-band rainfall algorithm for light rain estimation indicates the great potential of using D3R as a ground validation tool for the Global Precipitation Measurement (GPM) satellite precipitation product evaluations.
Journal ArticleDOI
An Integrated Approach to Weather Radar Calibration and Monitoring Using Ground Clutter and Satellite Comparisons
Valentin Louf,Alain Protat,Robert A. Warren,Scott Collis,David B. Wolff,Surendra Raunyiar,Christian Jakob,Walter A. Petersen +7 more
TL;DR: The stability and accuracy of weather radar reflectivity calibration are imperative for quantitative applications, such as rainfall estimation, severe weather monitoring and nowcasting, and as mentioned in this paper, and the accuracy of the reflectivity measurement is crucial for these applications.
References
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Ross Gunn,Gilbert D. Kinzer +1 more
TL;DR: In this article, the terminal velocities for distilled water droplets falling through stagnant air are accurately determined using a new method employing electronic techniques, and the over-all accuracy of the massterminal-velocity measurements is better than 0.7 per cent.
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Electromagnetic Wave Propagation, Radiation, and Scattering
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Journal ArticleDOI
Potential Use of Radar Differential Reflectivity Measurements at Orthogonal Polarizations for Measuring Precipitation
T. A. Seliga,V. N. Bringi +1 more
TL;DR: In this paper, the potential use of differential reflectivity measurements at orthogonal polarizations to determine rain-fall rate was examined, which involves measurements of ZH and ZV, the radar reflectivity factors due to horizontally and vertically polarized incident waves respectively.
Journal ArticleDOI
A New Model for the Equilibrium Shape of Raindrops
TL;DR: In this paper, the equilibrium shape of raindrops has been determined from Laplace's equation using an internal hydrostatic pressure with an external aerodynamic pressure based on measurements for a sphere but adjusted for the effect of distortion.
Journal ArticleDOI
A wind tunnel investigation of the internal circulation and shape of water drops falling at terminal velocity in air
H. R. Pruppacher,K. V. Beard +1 more
TL;DR: The internal circulation and shape of water drops falling at terminal velocity in air of 20°C at sea level pressure, and nearly water saturated, were studied by means of a wind tunnel.