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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Drop Shapes Versus Fall Velocities in Rain: 2 Contrasting Examples
Merhala Thurai,V. N. Bringi,Walter A. Petersen,Lawrence D. Carey,Patrick N. Gatlin,Ali Tokay +5 more
TL;DR: In this article, the authors performed an in-depth analysis of two events, using two co-located 2D video disdrometers (2DVD) both with high calibration accuracy, and a C-band polarimetric radar located 15 km away.
Book ChapterDOI
Microphysical and Dielectric Properties of Hydrometeors
TL;DR: In this paper, an overview of microphysical properties of different hydrometeor types is provided, including different forms of size distributions of raindrops and ice particles, and statistics of the key parameters of SD such as liquid or ice water content, mean volume diameter, and normalized concentration are presented.
Experimental Investigation of X-band Polarimetric Algorithm for Drop Size Distribution Retrieval
TL;DR: Anagnostou et al. as mentioned in this paper investigated the impact of X-band polarimetric alignment on drop-size distribution in the context of climate change. But their work focused on a single model.
measurements via spaceborne millimeter wave radar
TL;DR: In this article , the authors present a simulation framework for cloud and precipitation measurements via spaceborne millimeter 10 wave radar composed of eight sub modules, and demonstrate the influence of the assumed physical parameters and optimize the microphysical modeling of the hydrometeors.
Journal ArticleDOI
Evaluation of Dual Polarization Rainfall Estimation Algorithm Applicability in Korea: A Case Study on Biseulsan Radar
TL;DR: In this paper, the authors evaluated the local applicability of JPOLE and CSU-HIDRO algorithms in Korea by using the observed rainfall data collected on the August, 2014 by the Biseulsan dual polarization radar data and KMA AWS.
References
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Journal ArticleDOI
The terminal velocity of fall for water droplets in stagnant air
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.
Book
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TL;DR: In this article, the fundamental field equations of wave propagation in homogeneous and layered media waveguides and cavities have been studied, including the effects of a dipole on the conducting earth, inverse scattering radiometry, and interferometry numerical techniques.
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.