Articulating and Stationary PARSIVEL Disdrometer Measurements in Conditions with Strong Winds and Heavy Rainfall

The influence of strong winds on the quality of optical Particle Size Velocity (PARSIVEL) disdrometer measurements is examined with data from Hurricane Ike in 2008 and from convective thunderstorms observed during the second Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX2) i...

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Published in:Journal of atmospheric and oceanic technology 2013-09, Vol.30 (9), p.2063-2080
Main Authors: Friedrich, Katja, Higgins, Stephanie, Masters, rest J, Lopez, Carlos R
Format: Article
Language:English
Subjects:
Fluid flow
Hurricanes
Marine
Meteorology
Particle size
Particle size distribution
Quality control
Raindrops
Rainfall measurement
Reflectivity
Sampling
Thunderstorms
Tornadoes
Wind
Wind speed
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description The influence of strong winds on the quality of optical Particle Size Velocity (PARSIVEL) disdrometer measurements is examined with data from Hurricane Ike in 2008 and from convective thunderstorms observed during the second Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX2) in 2010. This study investigates an artifact in particle size distribution (PSD) measurements that has been observed independently by six stationary PARSIVEL disdrometers. The artifact is characterized by a large number concentration of raindrops with large diameters (>5 mm) and unrealistic fall velocities (
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This study investigates an artifact in particle size distribution (PSD) measurements that has been observed independently by six stationary PARSIVEL disdrometers. The artifact is characterized by a large number concentration of raindrops with large diameters (&gt;5 mm) and unrealistic fall velocities (&lt;1 m s−1). It is correlated with high wind speeds and is consistently observed by stationary disdrometers but is not observed by articulating disdrometers (instruments whose sampling area is rotated into the wind). The effects of strong winds are further examined with a tilting experiment, in which drops are dripped through the PARSIVEL sampling area while the instrument is tilted at various angles, suggesting that the artifact is caused by particles moving at an angle through the sampling area. Most of the time, this effect occurs when wind speed exceeds 20 m s−1, although it was also observed when wind speed was as low as 10 m s−1. 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source Freely Accessible Science Journals
subjects Fluid flow
Hurricanes
Marine
Meteorology
Particle size
Particle size distribution
Quality control
Raindrops
Rainfall measurement
Reflectivity
Sampling
Thunderstorms
Tornadoes
Wind
Wind speed
title Articulating and Stationary PARSIVEL Disdrometer Measurements in Conditions with Strong Winds and Heavy Rainfall
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