Journal ArticleDOI
A method for estimating rain rate and drop size distribution from polarimetric radar measurements
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TLDR
The authors propose and demonstrate a method for retrieving DSD parameters for calculating rain rate and the characteristic particle size and shows improvement over the existing models and techniques because it can retrieve all three parameters of the gamma distribution.Abstract:
Polarimetric radar measurements are sensitive to the size, shape and orientation of raindrops and provide information about drop size distribution (DSD), canting angle distribution and rain rate. The authors propose and demonstrate a method for retrieving DSD parameters for calculating rain rate and the characteristic particle size. The DSD is assumed to be a gamma distribution and the governing parameters are retrieved from radar measurements: reflectivity (Z/sub HH/), differential reflectivity (ZDR), and a constrained relation between the shape (CL) and slope (/spl Lambda/) parameters derived from video disdrometer observations. The estimated rain rate is compared with that obtained from more traditional methods and the calculated characteristic size is compared with the measured values. The calculated K/sub DP/ based on the retrieved Gamma DSD is also compared with measurements. The proposed method shows improvement over the existing models and techniques because it can retrieve all three parameters of the gamma distribution. For maintaining the continuity of earlier published results, raindrop shape is assumed to be equilibrium.read more
Citations
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Journal ArticleDOI
Experiments in Rainfall Estimation with a Polarimetric Radar in a Subtropical Environment
TL;DR: 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.
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
Observations and Parameterizations of Particle Size Distributions in Deep Tropical Cirrus and Stratiform Precipitating Clouds: Results from In Situ Observations in TRMM Field Campaigns
Andrew J. Heymsfield,Aaron Bansemer,Paul R. Field,Stephen L. Durden,Jeffrey L. Stith,James E. Dye,William D. Hall,Cedric A. Grainger +7 more
TL;DR: In this paper, the authors report on the evolution of particle size distributions (PSDs) and habits as measured during slow, Lagrangian-type spiral descents through deep subtropical and tropical cloud layers in Florida, Brazil, and Kwajalein, Marshall Islands, most of which were precipitating.
Journal ArticleDOI
Cloud Microphysical Properties, Processes, and Rainfall Estimation Opportunities
TL;DR: In this paper, the relationship between raindrop-size distributions and radar reflectivity-rainfall rate (Z-R) relationships is revisited, this time from the combined approach of rain-forming physical processes that shape the RDSD, and a formulation of the RDP into the simplest free parameters of the rain intensity R, rainwater content W, and median volume drop diameter D0.
Journal ArticleDOI
Radar for hydrology: unfulfilled promise or unrecognized potential?
Alexis Berne,Witold F. Krajewski +1 more
TL;DR: In this article, a review of the use of weather radars in hydrology is presented, focusing on the opportunities and challenges of using weather radar in hydrological applications, such as flash floods, urban hydrology, rainfall spatial extremes.
References
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Book
Characterization of ceramics
TL;DR: This article reviewed the principles of Doppler radar and emphasized the quantitative measurement of meteorological parameters, and illustrated the relation of radar data and images to atmospheric phenomena such as tornadoes, microbursts, waves, turbulence, density currents, hurricanes, and lightning.
Journal ArticleDOI
Natural Variations in the Analytical Form of the Raindrop Size Distribution
TL;DR: In this paper, a three-parameter gamma distribution was used for dual-measurement techniques to determine rainfall rate, and the relationship between pairs of integral rainfall parameters using a three parameter gamma drop size distribution was investigated.
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The relation of raindrop-size to intensity
J. Otis Laws,Donald A. Parsons +1 more
TL;DR: The applicability of such results to conditions of natural rainfall has been thrown in doubt as discussed by the authors, and the results have been found to be affected by the drop-size and velocity of the artificial rains applied.
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Evidence from Tropical Raindrop Spectra of the Origin of Rain from Stratiform versus Convective Clouds
Ali Tokay,David A. Short +1 more
TL;DR: In this article, an empirical stratiform-convective classification method based on N 0 and R (rainfall rate) is presented. But, the occurrence of precipitation was found to be 74% (stratiform) and 26% (convection) but total rainfall, on the other hand, was...