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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Proceedings ArticleDOI
Effects of a gamma DSD with variable shape parameter on polarimetric radar moments
TL;DR: In this paper, the authors study parameterizations of the gamma DSD used in numerical weather prediction (NWP) and their effects on polarimetric radar variables and find an untypical behavior in $Z{DR}$ which occurs when using the DSD parameterization.
Journal ArticleDOI
Microphysical retrievals from simultaneous polarimetric and profiling radar observations
TL;DR: In this paper, a UHF wind profiler, an S-band polarimetric weather radar, and a video disdrometer are combined to estimate the observed drop size distribution (DSD).
Quantification of errors in polarimetric radar variables simulated from bulk microphysics parameterizations
TL;DR: Kumjian et al. as mentioned in this paper reported a significant number of errors in the testbed of a BULK MICROPHYSICS PARAMETERIZATION.
Journal ArticleDOI
Variations of Raindrop Size Distribution and Radar Retrieval in Outer Rainbands of Typhoon Mangkhut (2018)
Jingjing Lyu,Huiwen Xiao,Yuchun Du,Lina Sha,Yuqing Deng,Weikai Jia,Shengjie Niu,Yue Zhou,Guqian Pang +8 more
TL;DR: Wang et al. as discussed by the authors investigated the microphysical properties of raindrops from Typhoon Mangkhut's outer rainbands as the storm made landfall in South China in September 2018, and proposed a modified stratiform rain-convective rain separator line based on D0 and Nw scatterplots.
Journal ArticleDOI
A Case Study on Microphysical Characteristics of Mesoscale Convective System Using Generalized DSD Parameters Retrieved from Dual-Polarimetric Radar Observations
TL;DR: The microphysical characteristics of a mesoscale convective system (MCS) during a summer monsoon of South Korea are investigated using the generalized drop size distributions (DSD) that are derived from S-band dual-polarization radar data.
References
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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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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.