Dependence of rain integral parameters on measured rain drop velocities at a tropical location

doi:10.1109/URSIAP-RASC.2016.7601353

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Dependence of rain integral parameters on measured rain drop velocities at a tropical location

Proceedings Article•DOI•

Dependence of rain integral parameters on measured rain drop velocities at a tropical location

Thumree Sarkar¹, Soumyajyoti Jana¹, Animesh Maitra¹•Institutions (1)

University of Calcutta¹

01 Aug 2016-pp 1545-1548

TL;DR: In this paper, a study using a LPM for several rain events spanning the monsoon season of 2013 at Kolkata, India, reflects the effect of velocity measurements on Z-R and A-R relationship for both convective and stratiform events.

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Abstract: A study using a Laser Precipitation Monitor (LPM) for several rain events spanning the monsoon season of 2013 at Kolkata, India, reflects the effect of velocity measurements on Z-R and A-R relationship for both convective and stratiform events. Laser precipitation monitor measures ground based drop size distribution and drop velocity simultaneously. The presence of high velocity small drops (super-terminal) and low velocity large drops (sub-terminal) is abundantly experienced during different types of rain in the tropical region as observed by a Laser precipitation monitor (LPM). The number fraction of these drops is higher in convective rain than in stratiform rain. As the observed drop velocities show significant variation from the theoretically derived velocities, it is possible to get noticeable difference in rain rate calculations, Z-R and A-R relationships. The study involves a comparison of Z-R and A-R relations using both Gunn-Kinzer (GK) and actual observed velocity in convective and stratiform rain regimes separately as there was significant difference in number fraction of high velocity and low velocity rain drops in both the cases.

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Journal Article•DOI•

Comparison between Pludix and impact/optical disdrometers during rainfall measurement campaigns

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Clelia Caracciolo¹, Franco Prodi¹, Remko Uijlenhoet²•Institutions (2)

University of Ferrara¹, Wageningen University and Research Centre²

01 Nov 2006-Atmospheric Research

TL;DR: In this paper, the performances of two couples of disdrometers based on different measuring principles are compared: a classical Joss-Waldvogel dis-rometer and a recently developed device, called the Pludix tested in Ferrara, Italy, and the two-dimensional video dis-remeter (2DVD) tested in Cabauw, The Netherlands.

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37 citations

"Dependence of rain integral paramet..." refers background or methods in this paper

...Again, raindrops larger than 5mm, which may be artifact due to coincident error [8,9,7], are not considered in our study....
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...Human ey heat distribution with and without external source is also examined by Kunter using weighted extend d basis splines with FEM model [8-9]....
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Journal Article•DOI•

Assessment of different raindrop size measuring techniques: Inter-comparison of Doppler radar, impact and optical disdrometer

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Thumree Sarkar¹, Saurabh Das¹, Animesh Maitra¹•Institutions (1)

University of Calcutta¹

15 Jun 2015-Atmospheric Research

TL;DR: In this paper, the performances of three instruments namely, Joss-Waldvogel disdrometer, laser precipitation monitor and micro rain radar, are assessed in terms of their ability to measure rain related parameters and to better understand the dependency of measured parameters on the working principles of the instruments.

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35 citations

"Dependence of rain integral paramet..." refers background or methods in this paper

...In 2000, Mangoud combined the frequencydomai method of moments (MOM) nd fi ite differ nce time domain (FDTD) for the simulation of human interaction with cellular phones [7]....
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...It is highly accurate while measuring light rain intensities although sometimes for very high rain rate LPM measurements show high rain rates compared to MRR or impact disdrometer [7]....
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...Again, raindrops larger than 5mm, which may be artifact due to coincident error [8,9,7], are not considered in our study....
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Journal Article•DOI•

Further evidence for superterminal raindrops

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Michael L. Larsen¹, Alexander B. Kostinski², A. R. Jameson•Institutions (2)

College of Charleston¹, Michigan Technological University²

16 Oct 2014-Geophysical Research Letters

TL;DR: In this paper, a network of optical disdrometers (including laser precipitation monitors and a two-dimensional video dis-rometer) was used to determine whether the recent reports of superterminal raindrops were spurious results of drop breakup occurring on instrumentation.

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Abstract: A network of optical disdrometers (including laser precipitation monitors and a two-dimensional video disdrometer) was utilized to determine whether the recent reports of “superterminal” raindrops were spurious results of drop breakup occurring on instrumentation. Results unequivocally show that superterminal raindrops at small (less than 1 mm) sizes are ubiquitous, are measurable over an extended area, and appear in every rain event investigated. No evidence was found to suggest that superterminal drops are the result of drop breakup due to impact with the measurement instrument; thus, if the superterminal drops are the result of drop fragmentation, this fragmentation happens in the ambient atmosphere during all rain events measured in this study. The ubiquity of superterminal drops at small drop sizes raises natural questions regarding rain accumulation estimations, estimates of drop size distributions, and erosion characterization.

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34 citations

"Dependence of rain integral paramet..." refers background in this paper

...[5] established the fact of presence of high velocity small drops and the effect of drop break up/coalescence on drop velocity....
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...Keck studied conduction of thermal stimuli in the human temporal bone and reported that the temperature difference across the horizontal semicircular canal was of shorter duration than the absolute temperature change [5]....
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Journal Article•DOI•

Simulations of drop fall in a homogeneous isotropic turbulent flow

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Mark Pinsky¹, Alexander Khain¹•Institutions (1)

Hebrew University of Jerusalem¹

01 May 1996-Atmospheric Research

TL;DR: In this article, drop motion in a turbulent flow is studied using a model of homogeneous and isotropic turbulence, which allows us to generate different realizations of the random velocity field component with given latitudinal and lateral correlation functions and a spatial structure obeys the Kolmogorov theory.

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33 citations

Journal Article•DOI•

The effect of reported high-velocity small raindrops on inferred drop size distributions and derived power laws

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Hidde Leijnse¹, Hidde Leijnse², Remko Uijlenhoet²•Institutions (2)

Royal Netherlands Meteorological Institute¹, Wageningen University and Research Centre²

23 Jul 2010-Atmospheric Chemistry and Physics

TL;DR: In this article, the authors quantify the effect of this phenomenon on raindrop size distribution measurements from a Joss-Waldvogel disdrometer, a 2-D Video Distrometer and a vertically-pointing Doppler radar.

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Abstract: . It has recently been shown that at high rainfall intensities, small raindrops may fall with much larger velocities than would be expected from their diameters. These were argued to be fragments of recently broken-up larger drops. In this paper we quantify the effect of this phenomenon on raindrop size distribution measurements from a Joss-Waldvogel disdrometer, a 2-D Video Distrometer, and a vertically-pointing Doppler radar. Probability distributions of fall velocities have been parameterized, where the parameters are functions of both rainfall intensity and drop size. These parameterizations have been used to correct Joss-Waldvogel disdrometer measurements for this phenomenon. The effect of these corrections on fitted scaled drop size distributions are apparent but not major. Fitted gamma distributions for three different types of rainfall have been used to simulate drop size measurements. The effect of the high-velocity small drops is shown to be minor. Especially for the purpose of remote sensing of rainfall using radar, microwave links, or optical links, the errors caused by using the slightly different retrieval relations will be masked completely by other error sources.

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18 citations

"Dependence of rain integral paramet..." refers background in this paper

...Considerable work has been done in developing RF exposure standards and guidelines by various organizations ICNIRP (International Commite on Non-Ionising Radiation Protection), WHO (World Health Organization) and IEEE [1-3]....
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...1349 978-1-4673-8801-6/16/$31.00 ©2016 IEEE Dependence of Rai Integral Parameters n Measured Rain Drop Velocities at a Tropical Location Thumree Sarkar Institute of Radio Physics and Electronics University of Calcutta Kolkata, India mantu.abc@gmail.com...
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...Accurate measurement and knowledge of the DSD feature serve as an input to the rainfall estimation, weather forecasting and related applications [1]....
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...Especially mobile phone radiations effect on lossy-dielectric materials such as biological tissues in which result thermal energy increase [1]....
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...This kind of weather radar, so called an atmospheric profiler, points towards the sky and observes meteorological conditions according to the height [1]....
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