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
Particle imaging auto-measurement system for microphysical characteristics of raindrops in natural rain
Zhan Xiaoyun,Zhan Xiaoyun,Zhao Jun,Zhao Jun,Qian Feng,Shui Junfeng,Shui Junfeng,Guo Minghang,Guo Minghang +8 more
TL;DR: In this article, a light field and imaging system was designed based on the particle imaging measurement technology to explore microphysical properties of raindrops, and then a raindrop measurement system combined with a charge coupled device sensor was developed.
Journal ArticleDOI
Evaluation of the Uncertainty Level in Radar-Rainfall Technology in Korea: Focus on Comparative Analysis with the United States
TL;DR: In this paper, the Biseulsan Rainfall Radar System (dual-polarization radar), which was first introduced in Korea, was compared with those of previous studies in the United States and then reviewed to assess the level of Korean technology for uncertainty of rainfall data from the radar.
Journal ArticleDOI
Evaluation and Modification of Microphysics Schemes on the Cold Pool Evolution for a Simulated Bow Echo in Southeast China
TL;DR: Wang et al. as discussed by the authors simulated a merger-formation bow echo (MFBE) in southeast China during the pre-summer rainy season (PSRS) using three microphysics schemes including Thompson (THOM), Morrison (MORR), and Weather Research and Forecasting Double-Moment 6-Class (WDM6) schemes to compare against polarimetric observations and Variational Doppler Radar Analysis System (VDRAS) analyses.
Journal ArticleDOI
The development of rainfall retrievals from radar at Darwin
Robert Jackson,Scott Collis,Valentin Louf,Alain Protat,Dié Wang,Scott E. Giangrande,Elizabeth J. Thompson,Brenda Dolan,Scott W. Powell +8 more
TL;DR: In this paper, the applicability of several specific attenuation and dual-polarization-based rainfall estimators in tropical settings using a 4-year archive of Darwin disdrometer datasets in conjunction with C-band polarization (CPOL) observations is challenged.
References
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Journal ArticleDOI
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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.
Book
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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.